SEARCH · Search NASA
Results for “MnZn”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Materials Data on MnZn(InS2)4 by Materials Project
MnZn(InS2)4 crystallizes in the monoclinic Cm space group. The structure is two-dimensional and consists of two MnZn(InS2)4 sheets oriented in the (1, 0, 0) direction. Mn2+ is bonded to six S2- atoms to form MnS6 octahedra that share a cornercorner with one ZnS4 tetrahedra, corners with five InS4 tetrahedra, edges with two equivalent MnS6 octahedra, and edges with four equivalent InS6 octahedra. There are a spread of Mn–S bond distances ranging from 2.54–2.64 Å. Zn2+ is bonded to four S2- atoms to form ZnS4 tetrahedra that share a cornercorner with one MnS6 octahedra, corners with two equivalent InS6 octahedra, corners with two equivalent ZnS4 tetrahedra, and corners with four equivalent InS4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–62°. There are a spread of Zn–S bond distances ranging from 2.35–2.41 Å. There are four inequivalent In3+ sites. In the first In3+ site, In3+ is bonded to four S2- atoms to form InS4 tetrahedra that share a cornercorner with one InS6 octahedra, corners with two equivalent MnS6 octahedra, and corners with six InS4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–60°. There are a spread of In–S bond distances ranging from 2.44–2.52 Å. In the second In3+ site, In3+ is bonded to four S2- atoms to form InS4 tetrahedra that share a cornercorner with one MnS6 octahedra, corners with two equivalent InS6 octahedra, and corners with six InS4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–59°. There are one shorter (2.44 Å) and three longer (2.51 Å) In–S bond lengths. In the third In3+ site, In3+ is bonded to six S2- atoms to form InS6 octahedra that share corners with two equivalent ZnS4 tetrahedra, corners with four InS4 tetrahedra, edges with two equivalent InS6 octahedra, and edges with four equivalent MnS6 octahedra. There are a spread of In–S bond distances ranging from 2.60–2.71 Å. In the fourth In3+ site, In3+ is bonded to four S2- atoms to form InS4 tetrahedra that share a cornercorner with one InS6 octahedra, corners with two equivalent MnS6 octahedra, corners with two equivalent InS4 tetrahedra, and corners with four equivalent ZnS4 tetrahedra. The corner-sharing octahedra tilt angles range from 61–66°. There are a spread of In–S bond distances ranging from 2.46–2.53 Å. There are eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a trigonal non-coplanar geometry to two equivalent Zn2+ and one In3+ atom. In the second S2- site, S2- is bonded in a trigonal non-coplanar geometry to one Zn2+ and two equivalent In3+ atoms. In the third S2- site, S2- is bonded to two equivalent Mn2+ and two In3+ atoms to form SMn2In2 tetrahedra that share corners with six SMn2In2 tetrahedra and edges with two equivalent SMnIn3 trigonal pyramids. In the fourth S2- site, S2- is bonded to one Mn2+, one Zn2+, and two equivalent In3+ atoms to form distorted SMnZnIn2 tetrahedra that share corners with six SMn2In2 tetrahedra, corners with three equivalent SMnIn3 trigonal pyramids, and an edgeedge with one SMnIn3 trigonal pyramid. In the fifth S2- site, S2- is bonded in a trigonal non-coplanar geometry to three In3+ atoms. In the sixth S2- site, S2- is bonded in a trigonal non-coplanar geometry to three In3+ atoms. In the seventh S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mn2+ and two In3+ atoms. In the eighth S2- site, S2- is bonded to one Mn2+ and three In3+ atoms to form distorted SMnIn3 trigonal pyramids that share corners with three equivalent SMnZnIn2 tetrahedra, corners with two equivalent SMnIn3 trigonal pyramids, and edges with three SMn2In2 tetrahedra.
Materials Data on MnZn by Materials Project
MnZn is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mn is bonded in a body-centered cubic geometry to eight equivalent Zn atoms. All Mn–Zn bond lengths are 2.60 Å. Zn is bonded in a body-centered cubic geometry to eight equivalent Mn atoms.
Materials Data on MnZn by Materials Project
MnZn is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Mn is bonded to six equivalent Mn and six equivalent Zn atoms to form MnMn6Zn6 cuboctahedra that share corners with eighteen equivalent MnMn6Zn6 cuboctahedra, edges with six equivalent MnMn6Zn6 cuboctahedra, edges with twelve equivalent ZnMn6Zn6 cuboctahedra, faces with eight equivalent MnMn6Zn6 cuboctahedra, and faces with twelve equivalent ZnMn6Zn6 cuboctahedra. All Mn–Mn bond lengths are 2.64 Å. All Mn–Zn bond lengths are 2.68 Å. Zn is bonded to six equivalent Mn and six equivalent Zn atoms to form ZnMn6Zn6 cuboctahedra that share corners with eighteen equivalent ZnMn6Zn6 cuboctahedra, edges with six equivalent ZnMn6Zn6 cuboctahedra, edges with twelve equivalent MnMn6Zn6 cuboctahedra, faces with eight equivalent ZnMn6Zn6 cuboctahedra, and faces with twelve equivalent MnMn6Zn6 cuboctahedra. All Zn–Zn bond lengths are 2.64 Å.
Materials Data on MnZn(CrS2)4 by Materials Project
MnZn(CrS2)4 is Spinel-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Cr3+ is bonded to six S2- atoms to form CrS6 octahedra that share corners with three equivalent MnS4 tetrahedra, corners with three equivalent ZnS4 tetrahedra, and edges with six equivalent CrS6 octahedra. All Cr–S bond lengths are 2.42 Å. Mn2+ is bonded to four equivalent S2- atoms to form MnS4 tetrahedra that share corners with twelve equivalent CrS6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Mn–S bond lengths are 2.37 Å. Zn2+ is bonded to four equivalent S2- atoms to form ZnS4 tetrahedra that share corners with twelve equivalent CrS6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Zn–S bond lengths are 2.37 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to three equivalent Cr3+ and one Mn2+ atom to form a mixture of distorted edge and corner-sharing SMnCr3 trigonal pyramids. In the second S2- site, S2- is bonded to three equivalent Cr3+ and one Zn2+ atom to form distorted SZnCr3 trigonal pyramids that share corners with twelve SMnCr3 trigonal pyramids and edges with three equivalent SZnCr3 trigonal pyramids.
Materials Data on MnZn(FeO2)4 by Materials Project
MnZn(FeO2)4 is Spinel-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Mn2+ is bonded to four equivalent O2- atoms to form MnO4 tetrahedra that share corners with twelve equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 59°. All Mn–O bond lengths are 2.04 Å. Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with three equivalent MnO4 tetrahedra, corners with three equivalent ZnO4 tetrahedra, and edges with six equivalent FeO6 octahedra. There are three shorter (2.04 Å) and three longer (2.06 Å) Fe–O bond lengths. Zn2+ is bonded to four equivalent O2- atoms to form ZnO4 tetrahedra that share corners with twelve equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Zn–O bond lengths are 2.01 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Mn2+ and three equivalent Fe3+ atoms to form a mixture of distorted edge and corner-sharing OMnFe3 trigonal pyramids. In the second O2- site, O2- is bonded to three equivalent Fe3+ and one Zn2+ atom to form distorted OZnFe3 trigonal pyramids that share corners with twelve OMnFe3 trigonal pyramids and edges with three equivalent OZnFe3 trigonal pyramids.
Materials Data on MnZn(GeO3)2 by Materials Project
Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
Materials Data on MnZn(SiO3)2 by Materials Project
Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
Materials Data on MnZn(Br2O3)2 by Materials Project
Mn(O3Br)2ZnBr2 crystallizes in the orthorhombic Pbam space group. The structure is one-dimensional and consists of two Mn(O3Br)2 ribbons oriented in the (1, 0, 0) direction and four zinc dibromide molecules. In each Mn(O3Br)2 ribbon, there are two inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded in an octahedral geometry to six O2- atoms. There is two shorter (1.70 Å) and four longer (2.12 Å) Mn–O bond length. In the second Mn2+ site, Mn2+ is bonded in an octahedral geometry to six O2- atoms. There is two shorter (1.68 Å) and four longer (2.12 Å) Mn–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Mn2+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one Mn2+ and one Br2+ atom. The O–Br bond length is 1.72 Å. In the third O2- site, O2- is bonded in a single-bond geometry to one Mn2+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Mn2+ and one Br2+ atom. The O–Br bond length is 1.72 Å. Br2+ is bonded in a water-like geometry to two O2- atoms.
Encapsulation Residual Stress and Ferrite Loss in Inductive Coil Assemblies
As inductive wireless charging reaches higher power levels, thermal management and mechanical durability become more critical. To address these concerns, past works have demonstrated the benefit of encapsulating coil assemblies in thermally conductive materials. However, due to the sensitivity of the MnZn ferrites commonly used in coil assemblies to mechanical stress, care must be taken to avoid creating large stresses in the ferrite that cause higher hysteresis loss. The stress formation in the encapsulant curing process is overviewed and modeled and an experiment is performed to demonstrate the effect in a small-scale coil assembly. Finally, the effect is shown in the reduced coil-coil efficiency of a first generation high power inductive power transfer prototype using a stiff epoxy compared to better performance in a second prototype using a softer thermally-conductive silicone encapsulant.
Design, Fabrication, and Characterization of UHF Ferrite Hybrid Absorbers
The is a poster on the fabrication and characterization of NiZn and MnZn ferrites for ultra-high frequency (UHF) RF absorbers. This will be presented at the American Ceramic Society EMA 2025 conference.
Wide Temperature Core Loss Characteristics of Transverse Magnetically Annealed Amorphous Tapes for High Frequency Aerospace Magnetics
100 kHz core loss properties of sample transverse magnetically annealed, cobalt-based amorphous and iron-based nanocrystalline tape wound magnetic cores are presented over the temperature range of -150 C to 150 C, at selected values of B(sub peak). For B-fields not close to saturation, the core loss is not sensitive to temperature in this range and is as low as seen in the best MnZn power ferrites at their optimum temperatures. Frequency resolved characteristics are given over the range of 50 kHz to 1 MHz, but at B(sub peak) = 0.1 T and 50 C only. For example, the 100 kHz specific core loss ranged from 50 - 70 mW/cubic cm for the 3 materials, when measured at 0.1 T and 50 C. This very low high frequency core loss, together with near zero saturation magnetostriction and insensitivity to rough handling, makes these amorphous ribbons strong candidates for power magnetics applications in wide temperature aerospace environments.
Wide Temperature Characteristics of Transverse Magnetically Annealed Amorphous Tapes for High Frequency Aerospace Magnetics
100 kHz core loss and magnetization properties of sample transverse magnetically annealed, cobalt-based amorphous and iron-based nanocrystalline tape wound magnetic cores are presented over the temperature range of -150 to 150 C, at selected values of B(sub peak). For B-fields not close to saturation, the core loss is not sensitive to temperature in this range and is as low as seen in the best MnZn power ferrites at their optimum temperatures. Frequency resolved characteristics are given over the range of 50 kHz to 1 MHz, at B(sub peak) = 0.1 T and 50 C only. A linear permeability model is used to interpret and present the magnetization characteristics and several figures of merit applicable to inductor materials arc reviewed. This linear modeling shows that, due to their high permeabilities, these cores must he gapped in order to make up high Q or high current inductors. However, they should serve well, as is, for high frequency, anti ratcheting transformer applications.
Comparative Wide Temperature Core Loss Characteristics of Two Candidate Ferrites for the NASA/TRW 1500 W PEBB Converter
High frequency core loss and magnetization properties of commercial type MN8CX and PC40, high resistivity, MnZn based, power ferrites are presented over the temperature range of -l50 C to 150 C, at selected values of peak flux density (B (sub p)). Most of the data is at 100 kHz, with some data extended to 200 and 300 kHz for the MN8CX. Plots of the specific Core loss against temperature exhibit the minimal characteristic of such ferrites. These plots show that the MN8CX is optimized for minimum loss at about 25 C, whereas the PC40 is optimized at about 80 C. At the points of minimum loss and for the same B (sub p), the MN8CX has roughly half the losses of the PC40 at the lower flux densities. This loss ratio continues down to cryogenic temperatures. However, above about 80 C the losses are practically equal. The lowest 100 kHz loss recorded, 50 mW/cm3 for the MNGCX at a B (sub p) of 0.1T, equals that of a very low loss, Co based, transverse magnetically annealed, amorphous ribbon material. Except possibly at lower B (sub p) or much higher frequencies, these ferrites are not competitive for low losses over a wide temperature range with certain specialty amorphous materials. Permeability is computed from a linear model, plots against temperature are presented and again compared to the specialty amorphous materials.