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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TiAg by Materials Project

TiAg is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ti is bonded to four equivalent Ti and eight equivalent Ag atoms to form TiTi4Ag8 cuboctahedra that share corners with twelve equivalent TiTi4Ag8 cuboctahedra, edges with eight equivalent TiTi4Ag8 cuboctahedra, edges with sixteen equivalent AgTi8Ag4 cuboctahedra, faces with eight equivalent AgTi8Ag4 cuboctahedra, and faces with ten equivalent TiTi4Ag8 cuboctahedra. All Ti–Ti bond lengths are 2.89 Å. All Ti–Ag bond lengths are 2.92 Å. Ag is bonded to eight equivalent Ti and four equivalent Ag atoms to form AgTi8Ag4 cuboctahedra that share corners with twelve equivalent AgTi8Ag4 cuboctahedra, edges with eight equivalent AgTi8Ag4 cuboctahedra, edges with sixteen equivalent TiTi4Ag8 cuboctahedra, faces with eight equivalent TiTi4Ag8 cuboctahedra, and faces with ten equivalent AgTi8Ag4 cuboctahedra. All Ag–Ag bond lengths are 2.89 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiAg by Materials Project

TiAg crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ti is bonded to eight equivalent Ti and four equivalent Ag atoms to form distorted TiTi8Ag4 cuboctahedra that share corners with four equivalent TiTi8Ag4 cuboctahedra, corners with eight equivalent AgTi4Ag8 cuboctahedra, edges with eight equivalent TiTi8Ag4 cuboctahedra, edges with sixteen equivalent AgTi4Ag8 cuboctahedra, faces with six equivalent AgTi4Ag8 cuboctahedra, and faces with twelve equivalent TiTi8Ag4 cuboctahedra. There are four shorter (2.79 Å) and four longer (2.92 Å) Ti–Ti bond lengths. All Ti–Ag bond lengths are 2.96 Å. Ag is bonded to four equivalent Ti and eight equivalent Ag atoms to form distorted AgTi4Ag8 cuboctahedra that share corners with four equivalent AgTi4Ag8 cuboctahedra, corners with eight equivalent TiTi8Ag4 cuboctahedra, edges with eight equivalent AgTi4Ag8 cuboctahedra, edges with sixteen equivalent TiTi8Ag4 cuboctahedra, faces with six equivalent TiTi8Ag4 cuboctahedra, and faces with twelve equivalent AgTi4Ag8 cuboctahedra. There are four shorter (2.92 Å) and four longer (2.98 Å) Ag–Ag bond lengths.

36 MATERIALS SCIENCE↗
NASA NTRS1971

Development of lithium diffused radiation resistant solar cells, part 2

The work performed to investigate the effect of various process parameters on the performance of lithium doped P/N solar cells is described. Effort was concentrated in four main areas: (1) the starting material, (2) the boron diffusion, (3) the lithium diffusion, and (4) the contact system. Investigation of starting material primarily involved comparison of crucible grown silicon (high oxygen content) and Lopex silicon (low oxygen content). In addition, the effect of varying growing parameters of crucible grown silicon on lithium cell output was also examined. The objective of the boron diffusion studies was to obtain a diffusion process which produced high efficiency cells with minimal silicon stressing and could be scaled up to process 100 or more cells per diffusion. Contact studies included investigating sintering of the TiAg contacts and evaluation of the contact integrity.

Payne, P. R.↗