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DOE OSTI2020

Materials Data on Nb3As by Materials Project

Nb3As crystallizes in the tetragonal P4_2/n space group. The structure is three-dimensional. there are three inequivalent Nb sites. In the first Nb site, Nb is bonded in a 2-coordinate geometry to four equivalent As atoms. There are a spread of Nb–As bond distances ranging from 2.51–2.95 Å. In the second Nb site, Nb is bonded in a 2-coordinate geometry to three equivalent As atoms. There are a spread of Nb–As bond distances ranging from 2.60–2.92 Å. In the third Nb site, Nb is bonded in a distorted bent 150 degrees geometry to two equivalent As atoms. There are one shorter (2.60 Å) and one longer (2.62 Å) Nb–As bond lengths. As is bonded in a 9-coordinate geometry to nine Nb atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1983

Experiments with phase transitions at very high pressure

Diamond cells were constructed for use to 1 Mbar. A refrigerator for cooling diamond cells was adapted for studies between 15 and 300 K. A cryostat for superconductivity studies between 1.5 to 300 K was constructed. Optical equipment was constructed for fluorescence, transmission, and reflectance studies. X-ray equipment was adapted for use with diamond cells. Experimental techniques were developed for X-ray diffraction studies using synchrotron radiation. AC susceptibility techniques were developed for detecting superconducting transitions. The following materials were studied: compressed solidified gases (Xe, Ar), semiconductors (Ge, Si, GaAs), superconductors (Nb3Ge, Nb3Si, Nb3As, CuCl), molecular crystals (I).

Spain, I. L.↗