Materials Data on HoAgSe2 by Materials Project

Abstract

AgHoSe2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ho3+ is bonded to six Se2- atoms to form HoSe6 octahedra that share corners with six equivalent HoSe6 octahedra, edges with four equivalent HoSe6 octahedra, and edges with eight equivalent AgSe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.85 Å) and four longer (2.89 Å) Ho–Se bond lengths. Ag1+ is bonded to six Se2- atoms to form AgSe6 octahedra that share corners with six equivalent AgSe6 octahedra, edges with four equivalent AgSe6 octahedra, and edges with eight equivalent HoSe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.85 Å) and four longer (2.89 Å) Ag–Se bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to four equivalent Ho3+ and two equivalent Ag1+ atoms to form a mixture of corner and edge-sharing SeHo4Ag2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second Se2- site, Se2- is bonded to two equivalent Ho3+ and four equivalent Ag1+ atoms to form SeHo2Ag4 octahedra that share corners with six equivalent SeHo2Ag4 octahedra and edges with twelve SeHo4Ag2 octahedra. The corner-sharing octahedral tilt angles are 0°.