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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on La2S3 by Materials Project

La2S3 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. there are three inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to eight S2- atoms to form a mixture of distorted corner, edge, and face-sharing LaS8 hexagonal bipyramids. There are a spread of La–S bond distances ranging from 2.91–3.12 Å. In the second La3+ site, La3+ is bonded to eight S2- atoms to form a mixture of distorted corner, edge, and face-sharing LaS8 hexagonal bipyramids. There are a spread of La–S bond distances ranging from 2.93–3.17 Å. In the third La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.88–3.31 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded to five La3+ atoms to form a mixture of distorted corner, edge, and face-sharing SLa5 trigonal bipyramids. In the second S2- site, S2- is bonded in a 6-coordinate geometry to six La3+ atoms. In the third S2- site, S2- is bonded to five La3+ atoms to form a mixture of distorted corner, edge, and face-sharing SLa5 square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La2S3 by Materials Project

La2S3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.88–3.17 Å. In the second La3+ site, La3+ is bonded to seven S2- atoms to form distorted edge-sharing LaS7 pentagonal bipyramids. There are a spread of La–S bond distances ranging from 2.89–3.08 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded to five La3+ atoms to form a mixture of distorted edge, face, and corner-sharing SLa5 trigonal bipyramids. In the second S2- site, S2- is bonded to five La3+ atoms to form a mixture of distorted edge, face, and corner-sharing SLa5 square pyramids. In the third S2- site, S2- is bonded to five La3+ atoms to form a mixture of distorted edge and corner-sharing SLa5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
NASA NTRS1987

Structure and tensile strength of LaS(1.4)

The tensile strength of LaS(1.4) has been estimated by diametral stress testing at room temperature, 800 and 1300 K. Brittle, tensile-type failures were obtained at all temperatures when the crosshead speed was 0.0021 mm/s; however, a 1300 K test at 0.00085 mm/s produced plastic flow. The microstructure of LaS(1.4) consisted of two phases with beta-La2S3 comprising about 15 vol percent of the structure and gamma-La2S3 the remainder. Because of the limited amount of material available for testing, no correlation between microstructure and mechanical strength could be drawn.

Whittenberger, J. Daniel↗