Materials Data on CeSe2 by Materials Project

Abstract

CeSe2 is Keatite-like structured and crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. there are three inequivalent Ce4+ sites. In the first Ce4+ site, Ce4+ is bonded to four Se2- atoms to form corner-sharing CeSe4 tetrahedra. There are a spread of Ce–Se bond distances ranging from 2.71–2.74 Å. In the second Ce4+ site, Ce4+ is bonded to four Se2- atoms to form corner-sharing CeSe4 tetrahedra. All Ce–Se bond lengths are 2.70 Å. In the third Ce4+ site, Ce4+ is bonded to four Se2- atoms to form corner-sharing CeSe4 tetrahedra. There are two shorter (2.70 Å) and two longer (2.74 Å) Ce–Se bond lengths. There are seven inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a bent 150 degrees geometry to two Ce4+ atoms. In the second Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms. In the third Se2- site, Se2- is bonded in a linear geometry to two equivalent Ce4+ atoms. In the fourth Se2- site, Se2- is bonded in a bent 150 degrees geometry to two Ce4+ atoms. In the fifth Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms. In the sixth Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms. In the seventh Se2- site, Se2- is bonded in a linear geometry to two equivalent Ce4+ atoms.