Materials Data on KEuAsS4 by Materials Project
KEuAsS4 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of K–S bond distances ranging from 3.37–3.58 Å. Eu2+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Eu–S bond distances ranging from 2.98–3.58 Å. As5+ is bonded in a tetrahedral geometry to four S2- atoms. There are two shorter (2.19 Å) and two longer (2.20 Å) As–S bond lengths. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to one K1+, three equivalent Eu2+, and one As5+ atom. In the second S2- site, S2- is bonded in a 5-coordinate geometry to two equivalent K1+, two equivalent Eu2+, and one As5+ atom. In the third S2- site, S2- is bonded to three equivalent K1+, one Eu2+, and one As5+ atom to form a mixture of distorted edge and corner-sharing SK3EuAs trigonal bipyramids.