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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Nb5Ga3 by Materials Project

Nb5Ga3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Nb sites. In the first Nb site, Nb is bonded in a 6-coordinate geometry to two equivalent Nb and four equivalent Ga atoms. Both Nb–Nb bond lengths are 2.53 Å. All Nb–Ga bond lengths are 2.78 Å. In the second Nb site, Nb is bonded in a 5-coordinate geometry to five Ga atoms. There are a spread of Nb–Ga bond distances ranging from 2.60–2.90 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded to four equivalent Nb and two equivalent Ga atoms to form corner-sharing GaNb4Ga2 octahedra. The corner-sharing octahedral tilt angles are 0°. Both Ga–Ga bond lengths are 2.53 Å. In the second Ga site, Ga is bonded in a distorted q6 geometry to ten Nb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nb5Ga3 by Materials Project

Nb5Ga3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Nb sites. In the first Nb site, Nb is bonded in a 6-coordinate geometry to six Ga atoms. There are a spread of Nb–Ga bond distances ranging from 2.74–2.96 Å. In the second Nb site, Nb is bonded in a 6-coordinate geometry to two equivalent Nb and four equivalent Ga atoms. Both Nb–Nb bond lengths are 2.55 Å. All Nb–Ga bond lengths are 2.74 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a distorted q6 geometry to ten Nb atoms. In the second Ga site, Ga is bonded in a 10-coordinate geometry to eight equivalent Nb and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nb5Ga3 by Materials Project

Nb5Ga3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Nb sites. In the first Nb site, Nb is bonded in a 8-coordinate geometry to two equivalent Nb and six equivalent Ga atoms. Both Nb–Nb bond lengths are 2.65 Å. All Nb–Ga bond lengths are 2.74 Å. In the second Nb site, Nb is bonded in a 5-coordinate geometry to five equivalent Ga atoms. There are a spread of Nb–Ga bond distances ranging from 2.69–2.90 Å. Ga is bonded in a 9-coordinate geometry to nine Nb atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1973

High temperature superconductor NB3Ga

The discovery of superconductivity at 20.3 K in the Nb-Ga system by applying chemical vapor deposition (CVD) techniques to the materials preparation problem is reported. Films on ceramic substrates have been grown with superconducting onsets of up to 20.3 K. Critical fields at 4.2 K in excess of 300 kG and alpha's of 1100,000 T-A/sq cm have been obtained. The results confirm that the outstanding properties of Nb-Ga are due to an equilibrium configuration of the system, namely, the stoichiometric A-15 compound Nb3Ga, which is stable at relatively low temperatures. Practical materials preparation problems center on the codeposition of an adjacent Nb5Ga3 phase and the requirement that the deposition temperature be low. Some ternary alloys were also prepared, with part of the Ga replaced by Sn, Sb, Al, or Ge.

Vieland, L. J.↗