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6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NiAsSe by Materials Project

NiAsSe is Spinel-like structured and crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Ni3+ is bonded to three equivalent As1- and three equivalent Se2- atoms to form NiAs3Se3 octahedra that share corners with twelve equivalent NiAs3Se3 octahedra, corners with three equivalent SeNi3As tetrahedra, and corners with three equivalent AsNi3Se trigonal pyramids. The corner-sharing octahedra tilt angles range from 63–64°. All Ni–As bond lengths are 2.42 Å. All Ni–Se bond lengths are 2.46 Å. As1- is bonded to three equivalent Ni3+ and one Se2- atom to form AsNi3Se trigonal pyramids that share corners with three equivalent NiAs3Se3 octahedra, corners with nine equivalent SeNi3As tetrahedra, and corners with six equivalent AsNi3Se trigonal pyramids. The corner-sharing octahedral tilt angles are 79°. The As–Se bond length is 2.49 Å. Se2- is bonded to three equivalent Ni3+ and one As1- atom to form SeNi3As tetrahedra that share corners with three equivalent NiAs3Se3 octahedra, corners with six equivalent SeNi3As tetrahedra, and corners with nine equivalent AsNi3Se trigonal pyramids. The corner-sharing octahedral tilt angles are 80°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiAsS by Materials Project

NiAsS is Spinel-like structured and crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Ni3+ is bonded to three equivalent As1- and three equivalent S2- atoms to form NiAs3S3 octahedra that share corners with twelve equivalent NiAs3S3 octahedra, corners with three equivalent AsNi3S tetrahedra, and corners with three equivalent SNi3As tetrahedra. The corner-sharing octahedral tilt angles are 64°. All Ni–As bond lengths are 2.41 Å. All Ni–S bond lengths are 2.34 Å. As1- is bonded to three equivalent Ni3+ and one S2- atom to form AsNi3S tetrahedra that share corners with three equivalent NiAs3S3 octahedra, corners with six equivalent AsNi3S tetrahedra, and corners with nine equivalent SNi3As tetrahedra. The corner-sharing octahedral tilt angles are 78°. The As–S bond length is 2.33 Å. S2- is bonded to three equivalent Ni3+ and one As1- atom to form SNi3As tetrahedra that share corners with three equivalent NiAs3S3 octahedra, corners with six equivalent SNi3As tetrahedra, and corners with nine equivalent AsNi3S tetrahedra. The corner-sharing octahedral tilt angles are 79°.

36 MATERIALS SCIENCE↗
DOE OSTI2026

Accessing terapascal pressures on two-stage light-gas guns for high-energy-density research

We present pressure amplifiers that have been developed to enable the study of material behavior at terapascal (TPa) pressures using two-stage light-gas gun (2SLGG) facilities. When impacted by a hyper-velocity projectile, Mach reflections within the pressure amplifier eventually merge to form a Mach stem, generating a planar output shock that greatly exceeds the initial drive. Validation experiments demonstrated that peak pressures of 0.6 and 1.073 TPa were achieved in quartz samples for two different amplifier designs. These pressures represent an approximately fivefold increase over the sample pressures typically attainable at 2SLGG facilities. The temporal and spatial uniformity of the pressure drive is suitable for high-precision equation-of-state measurements of materials relative to a shock standard. This work greatly extends the capabilities of 2SLGG facilities and opens new avenues of study in high-energy-density physics using these drivers.

Gorman, Martin G. [First Light Fusion, Oxford (Uni↗