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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 109 records · Page 6
All sourcesNASA NTRSDOE OSTI
DOE OSTI2014

Sonochemical fabrication of Cu{sub 2}O@C/graphene nanohybrid with a hierarchical architecture

A three-dimensional Cu{sub 2}O@C/graphene nanohybrid hierarchical sphere-like architecture has been successfully synthesized by a sonochemical method. The as-prepared nanocomposite has been characterized using various techniques including powder X-ray diffraction, scanning electron microscopy, field emission transmission electron microscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and Fourier transmission infrared spectrometry. Secondary big hierarchical Cu{sub 2}O@C spheres (diameter of ∼200 nm) consist of primary small Cu{sub 2}O@C spheres (diameter of 5–10 nm), which are uniformly distributed on the graphene surface. In the primary small Cu{sub 2}O@C sphere, amorphous carbon is formed by the oxidation–reduction reaction between 1-aminopyrene and copper(II) acetate in the sonochemical process. Our facile sonochemical method may apply to the preparation of other metal oxide/graphene hierarchical nanohybrids. - Highlights: • The Cu{sub 2}O@C/graphene nanohybrid hierarchical architecture was obtained. • Secondary big hierarchical Cu{sub 2}O@C spheres (diameter of ∼200 nm) consist of primary small Cu{sub 2}O@C spheres (diameter of 5–10 nm). • 1-Aminopyrene serves as a “binding agent” operating through the π–π interactions.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2016

One-pot synthesis of tin-borophosphate-carbon composites as anode materials for Li-ion batteries

Sn{sub x}(Ca{sub 0.05}B{sub 0.975}P{sub 0.975}O{sub 3.95}){sub 1−x}/C composites as anode material for Li-ion batteries, with x=0.83 and x=0.71 were synthesized by a facile route including cellulose as carbon source. The composites were characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy and {sup 119}Sn Mössbauer spectroscopy. In the latter case, different tin phases were found in the composite including the Sn{sup II}-based amorphous interface between metallic tin and borophosphate particles that improves the dispersion of the active species. The best electrochemical performances were obtained for x=0.71 that were further improved by ball-milled the composite with a small amount of carbon black. - Graphical abstract: {sup 119}Sn Mössbauer spectra of Sn{sub x}(Ca{sub 0.05}B{sub 0.975}P{sub 0.975}O{sub 3.95}){sub 1−x}/C composites with x=0.83 (a) and x=0.71 (b).

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2014

Synthesis, characterization, and hydrogen uptake studies of magnesium nanoparticles by solution reduction method

Graphical abstract: X-ray diffraction (XRD) pattern of magnesium nanoparticles synthesized by solution reduction method with and without TOPO. - Highlights: • Simple and convenient method of preparing Mg nanoparticles. • Characterized by XRD, SEM, FESEM and TEM. • Trioctylphosphine oxide offers a greater control over the size of the particles. • Hydrogen uptake of samples at different temperatures and pressure of 4.5 MPa. - Abstract: Facile and simple, surfactant-mediated solution reduction method was used to synthesize monodisperse magnesium nanoparticles. Little amount of magnesium oxide nanoparticles were also formed due to the presence of TOPO and easy oxidation of magnesium, eventhough, all precautions were taken to avoid oxidation of the sample. Precise size control of particles was achieved by carefully varying the concentration ratio of two different types of surfactants, – trioctylphosphine oxide and hexadecylamine. Recrystallized magnesium nanoparticle samples with and without TOPO were analyzed by X-ray diffraction, scanning electron microscope, field emission scanning electron microscope, and transmission electron microscope. The peak diameters of particles were estimated from size distribution analysis of the morphological data. The particles synthesized in the presence and absence of TOPO found to have diameters 46.5 and 34.8 nm, respectively. This observed dependence of particle size on the presence of TOPO offers a convenient method to control the particle size by simply using appropriate surfactant concentrations. Exceptional enhancement in hydrogen uptake and kinetics in synthesized magnesium nanoparticles as compared to commercial magnesium sample was due to the smaller particle size and improved morphology. Overall hydrogen uptake not affected by the little variation in particle size with and without TOPO.

36 MATERIALS SCIENCE↗
DOE OSTI2015

Synthesis of aluminum nitride powders from a plasma-assisted ball milled precursor through carbothermal reaction

Highlights: • A novel and high efficiency synthesizing AlN powders method combining mechanical ball milling and DBDP has been developed. • The particle size, the crystallite size, the lattice distortion, the morphology of Al{sub 2}O{sub 3} powders, and the AlN conversion rate are investigated and compared under the ball milled Al{sub 2}O{sub 3} powders with DBDP and without DBDP. • The ball milled Al{sub 2}O{sub 3} powders with DBDP have small spherical structure morphology with very fine particles size and high specific surface area, which result in a higher chemical efficiency and a higher AlN conversion rate at lower thermal temperature. - Abstract: In this paper, aluminum nitride (AlN) powers have been produced with a novel and high efficiency method by thermal annealing at 1100–1600 °C of alumina (Al{sub 2}O{sub 3}) powders which were previously ball milled for various time up to 40 h with and without the assistant of dielectric barrier discharge plasma (DBDP). The ball milled Al{sub 2}O{sub 3} powders with DBDP and without DBDP and the corresponding synthesized AlN powers are characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscopy. From the characteristics of the ball milled Al{sub 2}O{sub 3} powders with DBDP and without DBDP, it can be seen that the ball milled Al{sub 2}O{sub 3} powders with DBDP have small spherical structure morphology with very fine particles size and high specific surface area, which result in a higher chemical efficiency and a higher AlN conversion rate at lower thermal temperature. Meanwhile, the synthesized AlN powders can be known as hexagonal AlN with fine crystal morphology and irregular lump-like structure, and have uniform distribution with the average particle size of about between 500 nm and 1000 nm. This provides an important method for fabricating ultra fine powders and synthesizing nitrogen compounds.

36 MATERIALS SCIENCE↗
DOE OSTI2017

Green solid-state chemical synthesis and excellent xylene-detecting behaviors of Y-doped α-MoO{sub 3} nanoarrays

Graphical abstract: Y-doped α-MoO{sub 3} arrays constructed by nanorods are firstly synthesized by facile two-step solid-state chemical reaction, which exhibited excellent xylene-sensing property. - Highlights: • The Y-doped α-MoO{sub 3} nanoarrays constructed by nanorods were simply synthesized by solid-state chemical reaction. • The α-MoO{sub 3} arrays exhibited excellent gas-sensing properties for xylene. • This study is helpful to explore the xylene gas-sensitive materials with good comprehensive performance. - Abstract: Y-doped α-MoO{sub 3} nanoarrays constructed by nanorods were simply synthesized by a facile and simple two-step solid-state chemical reaction. X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy were applied to characterize the micro-structures and surface chemical composition of the as-prepared products. The results suggested that Y element had been successfully doped into the α-MoO{sub 3} nanoarrays. The gas-sensing behaviors of Y-doped nanoarrays toward seven kinds of harmful gases were also investigated. The results indicated that the Y-doped α-MoO{sub 3} nanoarrays display not only an improved response (the response value reaches 28.3 to 100 ppm xylene), but also an excellent selectivity to xylene. The good xylene-detecting behaviors were attributed to smaller size and the relative larger surface area. Furthermore, the doping of Y increased the electron donor defects and oxygen vacancies, which accelerated the mobility of oxygen ions and enhanced the conductivity of material, resulting in enhanced response to xylene.

36 MATERIALS SCIENCE↗
DOE OSTI2018

Surfactant-free synthesis of m-BiVO4 nanoribbons and enhanced visible-light photocatalytic properties

Highlights: • m-BiVO{sub 4} nanoribbons were synthesized by solvothermal route. • m-BiVO{sub 4} exhibited enhanced photocatalytic activity and stable recyclability. • The superior performance can be ascribed to the low band gap, high surface area and unique morphology. - Abstract: Monoclinic Bismuth vanadate (m-BiVO{sub 4}) is a promising material for photocatalytic degradation of organic moieties. Uniform m-BiVO{sub 4} nanoribbons were synthesized by facile solvothermal route without using the surfactant and characterized by X-ray diffraction, scanning electron microscopy and UV–vis diffuse reflectance spectra technique. The obtained m-BiVO{sub 4} nanoribbons possess well defined 1-D architectures with homogenous morphology and surface area of 22.4 m{sup 2}/g. The prepared photocatalyst showed efficient photocatalytic activities up to 97% in 30 min against the degradation of methylene blue (MB) under visible-light irradiation. The prepared photocatalyst is recyclable and showed a very small change in activity after three consecutive cycles. This higher activity can be attributed to higher surface area and crystallinity, which signify the promising commercial application of m-BiVO{sub 4} nanoribbons as highly novel and highly efficient photocatalyst for the degradation of organic pollutants.

77 NANOSCIENCE AND NANOTECHNOLOGY↗
DOE OSTI2016

Synthesis of GaN:ZnO solid solution by solution combustion method and characterization for photocatalytic application

GaN-ZnO solid solution has emerged as a successful and reproducible photocatalyst for overall water splitting by one-step photoexcitation, with a bandgap in visible region. When the solid solution is formed, some of the Zn and O ions are replaced by Ga and N ions respectively and there is a narrowing of bandgap which is hypothesized as due to Zn3d-N2p repulsion. The traditional method of synthesis of GaN-ZnO solid solution is by nitridation of the starting oxides under constant ammonia flow. Here we report a solution combustion technique for the synthesis of the solid solution at a temperature about 500 ° C in a muffle furnace with metal nitrates as precursors and urea as the fuel. The as prepared samples showed change in color with the increased concentration of ZnO in the solution. The structural, microstructural, morphological and optical properties of the samples were realized by Powder X ray diffraction, Scanning electron microscopy, Energy dispersive X ray analysis, Transmission electron microscopy and Photoluminescence. Finally the hydrogen production efficiency of the GaN-ZnO nanopowders by water splitting was found, using methanol as a scavenger. The apparent quantum yield (AQY) of 0.048% is obtained for GaN-ZnO solid solution.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2016

Optical and electrical properties of Cu-based all oxide semi-transparent photodetector

Zero-bias operating Cu oxide-based photodetector was achieved by using large-scale available sputtering method. Cu oxide (Cu{sub 2}O or CuO) was used as p-type transparent layer to form a heterojunction by contacting n-type ZnO layer. All metal-oxide materials were employed to realize transparent device at room temperature and showed a high transparency (>75% at 600 nm) with excellent photoresponses. The structural, morphological, optical, and electrical properties of Cu oxides of CuO and Cu{sub 2}O are evaluated in depth by UV-visible spectrometer, X-ray diffraction, scanning electron microscopy, atomic force microscopy, Kelvin probe force microscopy, and Hall measurements. We may suggest a route of high-functional Cu oxide-based photoelectric devices for the applications in flexible and transparent electronics.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2018

Structural and Phase Transformations in Alloys during Spark Plasma Sintering of Ti + 23.5 at % Al + 21 at % Nb Powder Mixtures

We have studied the effect of sintering temperature on the structural and phase transformations of alloys produced by the spark plasma sintering of Ti + 23.5 at % Al + 21 at % Nb powder mixtures at temperatures in the range 1100–1550°C. The sintered alloys have been characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy (elemental X-ray mapping). The alloys sintered at temperatures of 1100 and 1200°C have been shown to have a nonuniform microstructure. According to electron microscopy results, the alloys consist of grains of the α{sub 2} and Nb{sub 2}Al phases and small precipitates of the O-phase (intermetallic compound Ti{sub 2}AlNb). In addition, there are particles of unreacted niobium and titanium. The alloys sintered at a temperature of 1300°C have a uniform lamellar structure.

36 MATERIALS SCIENCE↗
DOE OSTI2018

Synthesis of Hybrid Materials Based on Iron Nanoparticle-Decorated Multiwalled Carbon Nanotubes

Fe-containing nanoparticles have been grown for the first time on the surface of multiwalled carbon nanotubes by metalorganic chemical vapor deposition using iron acetylacetonate, Fe(acac){sub 3}, as a precursor. The resultant hybrid nanomaterial has been characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and thermogravimetric analysis. The results demonstrate that the synthesized material consists of multiwalled carbon nanotubes whose surface is decorated with iron nanoparticles.

77 NANOSCIENCE AND NANOTECHNOLOGY↗
DOE OSTI2018

Study on Microwave Performance of Low-Temperature Sintered, Ba(CoTi){sub 1.5}Fe{sub 9}O{sub 19} Ferrite for Application at UHF Frequency

M-type barium ferrite, Ba(CoTi){sub 1.5}Fe{sub 9}O{sub 19}, was synthesized via the solid-state reaction method. BBSZ, i.e., B{sub 2}O{sub 3} −Bi{sub 2}O{sub 3} −SiO{sub 2} −ZnO, was added to adjust the sintering temperature to values lower than that of silver (i.e., ∼961 °C). The phase formation characteristics, microstructure, magnetic, and microwave properties were characterized by x-ray diffraction, scanning electron microscope, vibrating sample magnetometer, and impedance analyzer, respectively. The results show that densification of samples were enhanced by increasing the amount of BBSZ with corresponding gains realized in magnetic properties. Such enhanced properties in Ba(CoTi){sub 1.5}Fe{sub 9}O{sub 19} are attributed to the low-melting point experienced as the result of BBSZ glass additives which gave rise to the stabilization of a liquid phase during sintering.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2019

Characterization and Integrated Fabrication of Al Components with Thick TiC{sub p}/Al Composite Coatings via Self-Propagating Reaction

A novel and quick process combining self-propagating reaction with vacuum-expendable pattern casting is presented to accomplish integrated preparation of millimeter-thick TiC{sub p}/Al composite coatings on the Al substrate. Titanium and graphite powders were mixed with the polytetrafluoroethylene (PTFE) additive and pasted on the expendable polystyrene (EPS) followed by compaction. Al components with in situ TiC{sub p}/Al composite coating were simultaneously synthesized at a relatively low temperature of molten Al, which was poured into the assembly of EPS and powder compact inside the silica sands. Differential scanning calorimetry, x-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy and transmission electron microscopy were used to systematically investigate the thermodynamic characteristics of the reaction, the phase constituents, microstructure and tribological properties of the coatings. The infiltration model describing the densification of the reaction coatings was also developed for the critical wetting condition. The wear characteristics were assessed using a pin-on-disk tribometer with various loads. Results showed that uniform TiC particles stimulated by the PTFE-activated self-propagating reaction afforded superior mechanical properties and wear resistance.

36 MATERIALS SCIENCE↗
DOE OSTI2015

Low temperature one-step synthesis of rutile TiO{sub 2}/BiOCl composites with enhanced photocatalytic activity

The rutile TiO{sub 2}/BiOCl composites were successfully fabricated by a facile one-step hydrolysis method at low temperature (50 °C). The X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–vis diffuse reflectance spectra, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, and X-ray photoelectron spectroscopy measurements were employed to characterize the phase structures, morphologies, optical properties, surface areas, and electronic state of the samples. The rutile TiO{sub 2}/BiOCl composites exhibited higher photocatalytic activity than pure BiOCl and rutile TiO{sub 2} for the degradation of phenol under artificial solar light irradiation. In addition, the photocatalytic mechanism has also been investigated and discussed. The enhanced photocatalytic performance of rutile TiO{sub 2}/BiOCl composites is closely related to the heterojunctions between BiOCl and rutile TiO{sub 2}, which can not only broaden the light adsorption range of BiOCl but also improve the electron–hole separation efficiency under artificial solar light irradiation. - Highlights: • Rutile TiO{sub 2}/BiOCl was prepared by a low temperature one-step hydrolysis method. • The synthetic method is quite convenient and energy-saving. • The composites exhibit enhanced photocatalytic activity on phenol degradation. • The high photocatalytic activity relates to the heterojunctions of BiOCl and TiO{sub 2}.

36 MATERIALS SCIENCE↗
DOE OSTI2017

Microstructural characteristics of σ phase and P phase in Ru-containing single crystal superalloys

Microstructural instability caused by topologically close-packed (TCP) phase precipitation restricts the useful compositional range of advanced Ni-base single crystal superalloys in industrial applications. Limited systematic investigations of TCP formers (Cr and Mo) additions on microstructural evolution of both the σ phase and the P phase in Ru-containing single crystal superalloys have been reported. In this study, the microstructural characteristics of σ phase and P phase were investigated in three Ru-containing superalloys with different levels of Cr and Mo additions at 950 °C and 1100 °C by using phase extraction, X-ray diffraction, scanning electron microscope and high resolution transmission electron microscopy. The experimental results indicated that the high level additions of Cr and Mo promoted the formation of σ phase and P phase, respectively. The amount of σ phase was much higher than that of P phase after long term exposure at 950 °C and 1100 °C. The sheet-like σ phase existed in the alloy with higher Cr addition after thermal exposure at 950 °C and 1100 °C for 1000 h, while the needle-like P phase precipitated in high Mo content alloy after thermal exposure at 1100 °C for 1000 h and the intergrowth of σ phase and P phase was observed after thermal exposure at 950 °C for 500 h. Both the σ phase and P phase were enriched in Re, W, Cr and Mo, but the σ phase contained more Re and Cr while the P phase contained more Mo and Ni, and Ru was found in both phases. The nucleation of σ phase was much easier than P phase due to the more ledge steps in the interfacial structure between σ phase and matrix, as well as the higher partitioning ratios of Re, Cr and Mo. This study is helpful to understand the microstructural evolution of σ phase and P phase, and to optimize the alloy design in Ru-containing superalloys. - Highlights: •Microstructures of σ phase and P phase were characterized in detail. •Cr and Mo influenced the precipitation of σ phase and P phase, respectively. •Partitioning ratios and interfacial relationship decided precipitation behaviors.

36 MATERIALS SCIENCE↗
DOE OSTI2015

Mesoporous hollow Zn{sub 2}SiO{sub 4}:Mn{sup 2+} nanospheres: The study of photoluminescence and adsorption properties

Graphical abstract: Mesoporous hollow structure of Zn{sub 2}SiO{sub 4}:Mn{sup 2+} phosphors. - Highlights: • Mesoporous hollow Zn{sub 2}SiO{sub 4}:Mn{sup 2+} nanospheres are prepared via the layer-by-layer technique. • The Zn{sub 2}SiO{sub 4}:Mn{sup 2+} nanospheres exhibit better adsorption capabilities of Pb{sup 2+}, Fe{sup 3+} than Cd{sup 2+}. • The Zn{sub 2}SiO{sub 4}:Mn{sup 2+} nanospheres exhibit strong green emission around 524 nm. • With the increase of doped Mn{sup 2+} concentration, the emission peak shows a red-shift. - Abstract: Mesoporous hollow Zn{sub 2}SiO{sub 4}:Mn{sup 2+} nanospheres were prepared via the layer-by-layer technique using CTAB as surfactant. The structures/microstructures and morphologies of the as-synthesized phosphors were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope and N{sub 2} adsorption–desorption porosimetry. The adsorption capacity to remove toxic metal ions in water was tested and the results showed that the Zn{sub 2}SiO{sub 4}:Mn{sup 2+} nanospheres exhibited better adsorption capabilities of Pb{sup 2+}, Fe{sup 3+} than Cd{sup 2+}. Moreover, the as-obtained hollow Zn{sub 2}SiO{sub 4}:Mn{sup 2+} phosphors exhibited strong green emission around 524 nm at room temperature. When the atomic ratio of Zn to Mn was 97:3, the emission intensity of Zn{sub 2}SiO{sub 4}:Mn{sup 2+} phosphor was about 1.2 times that of commercial phosphors. Furthermore, with the increase of doped Mn{sup 2+} concentration, the emission peak showed a red-shift.

36 MATERIALS SCIENCE↗
DOE OSTI2015

Ternary and coupled binary zinc tin oxide nanopowders: Synthesis, characterization, and potential application in photocatalytic processes

Highlights: • Mechanochemically synthesized nanocrystalline zinc tin oxide (ZTO) powders. • Photocatalytic degradation of alprazolam in the presence of ZTO water suspensions. • Coupled binary ZTO exhibits enhanced photocatalytic activity compared to ternary ZTO. - Abstract: In this paper, ternary and coupled binary zinc tin oxide nanocrystalline powders were prepared via simple solid-state mechanochemical method. X-ray diffraction, scanning electron microscopy, Raman and reflectance spectroscopy were used to study the structure and optical properties of the obtained powder samples. The thermal behavior of zinc tin oxide system was examined through simultaneous thermogravimetric-differential scanning calorimetric analysis. The efficiencies of ternary (Zn{sub 2}SnO{sub 4} and ZnSnO{sub 3}) and coupled binary (ZnO/SnO{sub 2}) zinc tin oxide water suspensions in the photocatalytic degradation of alprazolam, short-acting anxiolytic of the benzodiazepine class of psychoactive drugs, under UV irradiation were determined and compared with the efficiency of pure ZnO and SnO{sub 2}.

36 MATERIALS SCIENCE↗
DOE OSTI2016

Near white light emitting ZnAl{sub 2}O{sub 4}:Dy{sup 3+} nanocrystals: Sol–gel synthesis and luminescence studies

Highlights: • ZnAl{sub 2}O{sub 4}:Dy{sup 3+} spinel synthesized using sol–gel method. • Characterized by XRD, SEM and PL spectroscopy. • Investigations of emission, excitation and lifetime properties. • Evaluation of defect centers and trap parameters of the system. • Evaluation of CIE indices of near white light emitting phosphor. - Abstract: ZnAl{sub 2}O{sub 4}:Dy{sup 3+} nanoparticles were synthesized using citrate sol–gel method and characterized systematically using X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. Emission spectrum of pure ZnAl{sub 2}O{sub 4} shows intense violet blue emission under ultra violet irradiation. Based on electron paramagnetic resonance (EPR) results; it was attributed to presence of singly ionized oxygen vacancy centres in ZnAl{sub 2}O{sub 4}. On doping Dy{sup 3+} in ZnAl{sub 2}O{sub 4}, complete host–dopant energy transfer does not take place. Local structural investigation and lifetime measurements reveal that dysprosium ion is distributed between both Zn{sup 2+} and Al{sup 3+} sites. Near white light from ZnAl{sub 2}O{sub 4}:Dy{sup 3+} is attributed to combined host and dopant luminescence. The trap parameters such as activation energy (E) and frequency factor (s) for TSL glow peak 165 °C were determined using different heating rate method. Thermally stimulated emission showed the presence of oxygen related defect centre.

36 MATERIALS SCIENCE↗
DOE OSTI2017

Composite electrolytes ceramic Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}/glassy Li{sub 2}O-Y{sub 2}O{sub 3}-SiO{sub 2}

Highlights: • We synthesized Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}-x wt% 40.2Li{sub 2}O·5.7Y{sub 2}O{sub 3}·54.1SiO{sub 2} (x = 1–10) composites. • Density of the composite samples is higher than one of the sintered Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}. • The composition with x = 5 has high total conductivity, 2.5 × 10{sup −5} S cm{sup −1} at 25 °C. - Abstract: We have investigated the effect of lithium yttrium-silicate glass 40.2Li{sub 2}O·5.7Y{sub 2}O{sub 3}·54.1SiO{sub 2} on the density and total conductivity of tetragonal Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}. An optimal sintering temperature (1200 °C) was selected on the basis of a composite with 1 wt% of the glass having the highest density and total conductivity after annealing at this temperature. A series of composites Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}-x wt% 40.2Li{sub 2}O·5.7Y{sub 2}O{sub 3}·54.1SiO{sub 2} (x = 1–10) was prepared. The samples were characterized by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. The data revealed that the sintering additive interacted with Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}, causing the glass to crystallize during annealing. The conductivity of the composites was studied using complex impedance spectroscopy over a temperature range of 20–250 °C. The composite with x = 5 exhibited the highest total conductivity at room temperature: 2.5 × 10{sup −5} S cm{sup −1}.

36 MATERIALS SCIENCE↗