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6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RbSb by Materials Project

RbSb crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six Sb1- atoms. There are a spread of Rb–Sb bond distances ranging from 3.73–4.20 Å. In the second Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six Sb1- atoms. There are a spread of Rb–Sb bond distances ranging from 3.72–3.95 Å. There are two inequivalent Sb1- sites. In the first Sb1- site, Sb1- is bonded in a 8-coordinate geometry to six Rb1+ and two equivalent Sb1- atoms. There are one shorter (2.89 Å) and one longer (2.92 Å) Sb–Sb bond lengths. In the second Sb1- site, Sb1- is bonded in a 8-coordinate geometry to six Rb1+ and two equivalent Sb1- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbSb by Materials Project

RbSb is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Rb1+ is bonded to six equivalent Sb1- atoms to form a mixture of edge and corner-sharing RbSb6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Rb–Sb bond lengths are 3.80 Å. Sb1- is bonded to six equivalent Rb1+ atoms to form a mixture of edge and corner-sharing SbRb6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbSb by Materials Project

RbSb crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 5-coordinate geometry to five Sb1- atoms. There are a spread of Rb–Sb bond distances ranging from 3.70–3.88 Å. In the second Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six Sb1- atoms. There are a spread of Rb–Sb bond distances ranging from 3.73–4.00 Å. There are two inequivalent Sb1- sites. In the first Sb1- site, Sb1- is bonded in a 8-coordinate geometry to six Rb1+ and two equivalent Sb1- atoms. There are one shorter (2.90 Å) and one longer (2.91 Å) Sb–Sb bond lengths. In the second Sb1- site, Sb1- is bonded in a 7-coordinate geometry to five Rb1+ and two equivalent Sb1- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbSb by Materials Project

RbSb is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Rb1+ is bonded to four equivalent Sb1- atoms to form corner-sharing RbSb4 tetrahedra. All Rb–Sb bond lengths are 3.69 Å. Sb1- is bonded to four equivalent Rb1+ atoms to form corner-sharing SbRb4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2024

ASb 3 Mn 9 O 19 (A = K or Rb): New Mn-Based 2D Magnetoplumbites with Geometric and Magnetic Frustration

Magnetoplumbites are one of the most broadly studied families of hexagonal ferrites, typically with high magnetic ordering temperatures, making them excellent candidates for permanent magnets. However, magnetic frustration is rarely observed in magnetoplumbites. Herein, the discovery, synthesis, and characterization of the first Mn-based magnetoplumbite, as well as the first magnetoplumbite involving pnictogens (Sb), ASb 3 Mn 9 O 19 (A = K or Rb) are reported. The Mn 3+ ( S = 2) cations, further confirmed by DC magnetic susceptibility and X-ray photoelectron spectroscopy, construct three geometrically frustrated sublattices, including Kagome, triangular, and puckered honeycomb lattices. Magnetic properties measurements revealed strong antiferromagnetic spin–spin coupling as well as multiple low-temperature magnetic features. Heat capacity data does not show any prominent λ-anomaly, suggesting minimal associated magnetic entropy. Moreover, neutron powder diffraction (NPD) implied the absence of long-range magnetic ordering in KSb 3 Mn 9 O 19 down to 3 K. However, several magnetic peaks are observed in RbSb 3 Mn 9 O 19 at 3 K, corresponding to an incommensurate magnetic structure. Interestingly, strong diffuse scattering is seen in the NPD patterns of both compounds at low angles and is analyzed by reverse Monte Carlo refinements, indicating short-range spin ordering related to frustrated magnetism as well as 2D magnetic correlations in ASb 3 Mn 9 O 19 (A = K or Rb).

2-D magnetic correlation↗
NASA NTRS2011

Science Enabling ASICs and FEEs for the JUICE and JEO Missions

A family of science enabling radiation hard Application Specific Integrated Circuits (ASICs), Front End Electronics (FEEs) and Event Processing Systems, with flight heritage on many NASA missions, is presented. These technologies play an important role in the miniaturization of instruments -and spacecraft systems- at the same time increasing performance and reducing power. The technologies target time of flight, position sensing, and energy measurements as well as standard housekeeping and telemetry functions for particle and fields instruments, but find applications in other instrument categories too. More specifically the technologies include: the TOF chip, 1D and 2D Delay Lines with MCP detectors, for high precision fast and low power time of flight and position sensing; the Energy chip for multichannel SSD readout with time over threshold and standard voltage read out for TDC and ADC digitization; Fast multi channel read out chip with commandable thresholds; the TRIO chip for multiplexed ADC and housekeeping etc. It should be mentioned that the ASICs include basic trigger capabilities to enable random event processing in a heavy background of penetrators and UV foreground. Typical instruments include time of flight versus energy and look angle particle analyzers such as: plasma composition, energetic particle, neutral atom imaging as well as fast plasma and deltaE/E ion/electron telescopes. Flight missions include: Cassini/LEMMS, IMAGE/HENA, MESSENGER/EPPS/MLA/X-ray/MLA, STEREO, PLUTO-NH/PEPSSI/LORI, IBEX-Lo, JUNO/JEDI, RBSP/RBSPICE, MMS/HPCA/EPD, SO/SIS. Given the proven capability on heavy radiation missions such as JUNO, MMS and RBSB, as well diverse long duration missions such as MESSENGER, PLUTO and Cassini, it is expected that these technologies will play an important role in the particle and fields (at least) instruments on the upcoming JUICE and JEO missions.

Paschalidis, Nicholas↗