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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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8 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1983

Low-gravity experiments on Liquid Phase Miscibility Gap (LPMG) alloys: Materials Experiments Assembly (MEA)

Space shuttle experiments which study the massive separation which occurred during sounding rocket Al-In alloy tests are described. The gradient cool experiment studies surface tension driven droplet migration and particle pushing in an LPMG alloy. Isothermal experiments on the Te-Tl alloys test the hypothesis that LPMG systems with low surface energies produce relatively fine, and uniform emulsions and dispersions. It also examines the effect of droplet concentration on phase separation kinetics. Isothermal plunger experiments on Al-In alloys determine whether surface tension driven convection currents originating at a free surface contribute to massive separation. They ascertain whether In-rich droplets migrate under the action of a temperature gradient when they are not influenced by the crucible walls.

Gelles, S. H.↗
NASA NTRS1985

Liquid Phase Miscibility Gap Materials

The manner in which the microstructural features of liquid-phase miscibility gap alloys develop was determined. This will allow control of the microstructures and the resultant properties of these alloys. The long-duration low gravity afforded by the shuttle will allow experiments supporting this research to be conducted with minimal interference from buoyancy effects and gravitationally driven convection currents. Ground base studies were conducted on Al-In, Cu-Pb, and Te-Tl alloys to determine the effect of cooling rate, composition, and interfacial energies on the phase separation and solidification processes that influence the development of microstructure in these alloys. Isothermal and directional cooling experiments and simulations are conducted. The ground based activities are used as a technological base from which flight experiments formulated and to which these flight experiments are compared.

Gelles, S. H.↗
DOE OSTI2020

Materials Data on TlTe by Materials Project

TlTe crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Tl1+ is bonded in a 6-coordinate geometry to eight Te1- atoms. There are a spread of Tl–Te bond distances ranging from 3.46–4.11 Å. There are three inequivalent Te1- sites. In the first Te1- site, Te1- is bonded in a 10-coordinate geometry to eight equivalent Tl1+ and two equivalent Te1- atoms. Both Te–Te bond lengths are 3.11 Å. In the second Te1- site, Te1- is bonded in a 2-coordinate geometry to eight equivalent Tl1+ and six Te1- atoms. There are two shorter (3.11 Å) and four longer (3.40 Å) Te–Te bond lengths. In the third Te1- site, Te1- is bonded in a 10-coordinate geometry to eight equivalent Tl1+ and two equivalent Te1- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl5Te3 by Materials Project

Tl5Te3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a 5-coordinate geometry to five Te+1.67- atoms. There are a spread of Tl–Te bond distances ranging from 3.22–3.69 Å. In the second Tl1+ site, Tl1+ is bonded to six Te+1.67- atoms to form corner-sharing TlTe6 octahedra. The corner-sharing octahedra tilt angles range from 0–41°. There are two shorter (3.23 Å) and four longer (3.45 Å) Tl–Te bond lengths. There are two inequivalent Te+1.67- sites. In the first Te+1.67- site, Te+1.67- is bonded in a 2-coordinate geometry to ten Tl1+ atoms. In the second Te+1.67- site, Te+1.67- is bonded in a 8-coordinate geometry to eight Tl1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl5Te3 by Materials Project

Tl5Te3 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. there are three inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a 5-coordinate geometry to one Tl1+ and four Te+1.67- atoms. The Tl–Tl bond length is 3.46 Å. There are a spread of Tl–Te bond distances ranging from 3.33–3.57 Å. In the second Tl1+ site, Tl1+ is bonded in a 4-coordinate geometry to one Tl1+ and four Te+1.67- atoms. The Tl–Tl bond length is 3.49 Å. There are a spread of Tl–Te bond distances ranging from 3.34–3.57 Å. In the third Tl1+ site, Tl1+ is bonded in a 2-coordinate geometry to four Tl1+ and two Te+1.67- atoms. There are one shorter (3.24 Å) and one longer (3.46 Å) Tl–Te bond lengths. There are three inequivalent Te+1.67- sites. In the first Te+1.67- site, Te+1.67- is bonded in a 7-coordinate geometry to six Tl1+ and one Te+1.67- atom. The Te–Te bond length is 3.07 Å. In the second Te+1.67- site, Te+1.67- is bonded in a distorted q6 geometry to ten Tl1+ atoms. In the third Te+1.67- site, Te+1.67- is bonded in a distorted octahedral geometry to two equivalent Tl1+ and four equivalent Te+1.67- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlTe by Materials Project

TlTe crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Tl1+ is bonded in a 7-coordinate geometry to three equivalent Tl1+ and seven Te1- atoms. There are one shorter (3.58 Å) and two longer (3.79 Å) Tl–Tl bond lengths. There are a spread of Tl–Te bond distances ranging from 3.49–3.72 Å. There are three inequivalent Te1- sites. In the first Te1- site, Te1- is bonded in a 10-coordinate geometry to eight equivalent Tl1+ and two equivalent Te1- atoms. Both Te–Te bond lengths are 3.16 Å. In the second Te1- site, Te1- is bonded to four equivalent Tl1+ and four Te1- atoms to form corner-sharing TeTl4Te4 hexagonal bipyramids. There are two shorter (3.02 Å) and two longer (3.16 Å) Te–Te bond lengths. In the third Te1- site, Te1- is bonded in a 9-coordinate geometry to eight equivalent Tl1+ and one Te1- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl2Te3 by Materials Project

Tl2Te3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Tl3+ is bonded in a 6-coordinate geometry to six Te2- atoms. There are a spread of Tl–Te bond distances ranging from 3.46–3.70 Å. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 6-coordinate geometry to four equivalent Tl3+ and three Te2- atoms. There are a spread of Te–Te bond distances ranging from 2.88–3.62 Å. In the second Te2- site, Te2- is bonded in a 8-coordinate geometry to four equivalent Tl3+ and four equivalent Te2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl2Te3 by Materials Project

Tl2Te3 is beta Boron-derived structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent Tl3+ sites. In the first Tl3+ site, Tl3+ is bonded in a 6-coordinate geometry to six Te2- atoms. There are a spread of Tl–Te bond distances ranging from 3.39–3.71 Å. In the second Tl3+ site, Tl3+ is bonded in a 6-coordinate geometry to six Te2- atoms. There are a spread of Tl–Te bond distances ranging from 3.52–3.75 Å. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 6-coordinate geometry to three Tl3+ and three Te2- atoms. There are a spread of Te–Te bond distances ranging from 2.88–3.27 Å. In the second Te2- site, Te2- is bonded in a 8-coordinate geometry to six Tl3+ and two Te2- atoms. The Te–Te bond length is 3.13 Å. In the third Te2- site, Te2- is bonded in a 6-coordinate geometry to three Tl3+ and three Te2- atoms.

36 MATERIALS SCIENCE↗