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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.

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7 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2001

Partial Pressures of Te2 and Thermodynamic Properties of Ga-Te System

The partial pressures of Te2 in equilibrium with Ga(1-x)Te(x) samples were measured by optical absorption technique from 450 to 1100 C for compositions, x, between 0.333 and 0.612. To establish the relationship between the partial pressure of Te, and the measured optical absorbance, the calibration runs of a pure Te sample were also conducted to determine the Beer's Law constants. The partial pressures of Te2 in equilibrium with the GaTe(s) and Ga2Te3(s)compounds, or the so-called three-phase curves, were established. These partial pressure data imply the existence of the Ga3Te4(s) compound. From the partial pressures of Te2 over the Ga-Te melts, partial molar enthalpy and entropy of mixing for Te were derived and they agree reasonable well with the published data. The activities of Te in the Ga-Te melts were also derived from the measured partial pressures of Te2. These data agree well with most of the previous results. The possible reason for the high activity of Te measured for x less than 0.60 is discussed.

Su, Ching-Hua↗
DOE OSTI2020

Materials Data on Ga7Te10 by Materials Project

Ga7Te10 crystallizes in the trigonal R32 space group. The structure is three-dimensional. there are three inequivalent Ga+2.86+ sites. In the first Ga+2.86+ site, Ga+2.86+ is bonded in a trigonal non-coplanar geometry to three equivalent Te2- atoms. All Ga–Te bond lengths are 2.71 Å. In the second Ga+2.86+ site, Ga+2.86+ is bonded to four Te2- atoms to form a mixture of corner and edge-sharing GaTe4 tetrahedra. There are a spread of Ga–Te bond distances ranging from 2.59–2.71 Å. In the third Ga+2.86+ site, Ga+2.86+ is bonded to four Te2- atoms to form corner-sharing GaTe4 tetrahedra. There are a spread of Ga–Te bond distances ranging from 2.62–2.72 Å. There are five inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a trigonal non-coplanar geometry to three equivalent Ga+2.86+ atoms. In the second Te2- site, Te2- is bonded in an L-shaped geometry to two equivalent Ga+2.86+ atoms. In the third Te2- site, Te2- is bonded in a water-like geometry to two equivalent Ga+2.86+ atoms. In the fourth Te2- site, Te2- is bonded in a trigonal non-coplanar geometry to three Ga+2.86+ atoms. In the fifth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga+2.86+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga2Te5 by Materials Project

Ga2Te5 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Ga2+ is bonded to four equivalent Te+0.80- atoms to form edge-sharing GaTe4 tetrahedra. All Ga–Te bond lengths are 2.68 Å. There are two inequivalent Te+0.80- sites. In the first Te+0.80- site, Te+0.80- is bonded in a square co-planar geometry to four equivalent Te+0.80- atoms. All Te–Te bond lengths are 3.05 Å. In the second Te+0.80- site, Te+0.80- is bonded in a 2-coordinate geometry to two equivalent Ga2+ and one Te+0.80- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga2Te3 by Materials Project

Ga2Te3 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded to four Te2- atoms to form corner-sharing GaTe4 tetrahedra. There are one shorter (2.59 Å) and three longer (2.71 Å) Ga–Te bond lengths. In the second Ga3+ site, Ga3+ is bonded to four Te2- atoms to form corner-sharing GaTe4 tetrahedra. There are a spread of Ga–Te bond distances ranging from 2.60–2.72 Å. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a water-like geometry to two Ga3+ atoms. In the second Te2- site, Te2- is bonded in a trigonal non-coplanar geometry to three Ga3+ atoms. In the third Te2- site, Te2- is bonded in a trigonal non-coplanar geometry to three Ga3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GaTe by Materials Project

GaTe is Hittorf-derived structured and crystallizes in the monoclinic C2/m space group. The structure is one-dimensional and consists of two GaTe ribbons oriented in the (0, 1, 0) direction. there are three inequivalent Ga2+ sites. In the first Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Te2- atoms. There are one shorter (2.69 Å) and two longer (2.71 Å) Ga–Te bond lengths. In the second Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Te2- atoms. There are one shorter (2.70 Å) and two longer (2.71 Å) Ga–Te bond lengths. In the third Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Te2- atoms. There are two shorter (2.72 Å) and one longer (2.73 Å) Ga–Te bond lengths. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga2+ atoms. In the second Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga2+ atoms. In the third Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga3Te by Materials Project

Ga3Te crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ga is bonded in a 6-coordinate geometry to six equivalent Ga and four equivalent Te atoms. There are two shorter (3.04 Å) and four longer (3.16 Å) Ga–Ga bond lengths. There are two shorter (3.20 Å) and two longer (3.27 Å) Ga–Te bond lengths. Te is bonded to twelve equivalent Ga atoms to form a mixture of face and corner-sharing TeGa12 cuboctahedra.

36 MATERIALS SCIENCE↗