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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on ErAgSe2 by Materials Project

AgErSe2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Er3+ is bonded to six Se2- atoms to form ErSe6 octahedra that share corners with two equivalent AgSe6 octahedra, corners with four equivalent ErSe6 octahedra, edges with four equivalent ErSe6 octahedra, and edges with eight equivalent AgSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–7°. There are four shorter (2.85 Å) and two longer (2.86 Å) Er–Se bond lengths. Ag1+ is bonded to six Se2- atoms to form AgSe6 octahedra that share corners with two equivalent ErSe6 octahedra, corners with four equivalent AgSe6 octahedra, edges with four equivalent AgSe6 octahedra, and edges with eight equivalent ErSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–7°. There are four shorter (2.85 Å) and two longer (3.19 Å) Ag–Se bond lengths. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Er3+ and three equivalent Ag1+ atoms to form a mixture of edge and corner-sharing SeEr3Ag3 octahedra. The corner-sharing octahedra tilt angles range from 0–7°. In the second Se2- site, Se2- is bonded to three equivalent Er3+ and three equivalent Ag1+ atoms to form a mixture of edge and corner-sharing SeEr3Ag3 octahedra. The corner-sharing octahedra tilt angles range from 0–7°. In the third Se2- site, Se2- is bonded to three equivalent Er3+ and three equivalent Ag1+ atoms to form a mixture of edge and corner-sharing SeEr3Ag3 octahedra. The corner-sharing octahedra tilt angles range from 0–7°. There are two shorter (2.85 Å) and one longer (2.86 Å) Se–Er bond lengths. In the fourth Se2- site, Se2- is bonded to three equivalent Er3+ and three equivalent Ag1+ atoms to form a mixture of edge and corner-sharing SeEr3Ag3 octahedra. The corner-sharing octahedra tilt angles range from 0–7°. There are two shorter (2.85 Å) and one longer (2.86 Å) Se–Er bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErAgSe2 by Materials Project

AgErSe2 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. Er3+ is bonded to six Se2- atoms to form ErSe6 octahedra that share corners with four equivalent ErSe6 octahedra, corners with six equivalent AgSe4 trigonal pyramids, edges with four equivalent ErSe6 octahedra, and edges with three equivalent AgSe4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 43–52°. There are a spread of Er–Se bond distances ranging from 2.84–2.89 Å. Ag1+ is bonded to four Se2- atoms to form distorted AgSe4 trigonal pyramids that share corners with six equivalent ErSe6 octahedra, corners with four equivalent AgSe4 trigonal pyramids, and edges with three equivalent ErSe6 octahedra. The corner-sharing octahedra tilt angles range from 28–69°. There are a spread of Ag–Se bond distances ranging from 2.71–2.76 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Er3+ and two equivalent Ag1+ atoms to form a mixture of distorted corner and edge-sharing SeEr3Ag2 trigonal bipyramids. In the second Se2- site, Se2- is bonded to three equivalent Er3+ and two equivalent Ag1+ atoms to form a mixture of distorted corner and edge-sharing SeEr3Ag2 trigonal bipyramids.

36 MATERIALS SCIENCE↗