Materials Data on KErTe2 by Materials Project
KErTe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. K1+ is bonded to six equivalent Te2- atoms to form distorted KTe6 octahedra that share corners with six equivalent ErTe6 octahedra, edges with six equivalent KTe6 octahedra, and edges with six equivalent ErTe6 octahedra. The corner-sharing octahedral tilt angles are 10°. All K–Te bond lengths are 3.54 Å. Er3+ is bonded to six equivalent Te2- atoms to form ErTe6 octahedra that share corners with six equivalent KTe6 octahedra, edges with six equivalent KTe6 octahedra, and edges with six equivalent ErTe6 octahedra. The corner-sharing octahedral tilt angles are 10°. All Er–Te bond lengths are 3.09 Å. Te2- is bonded to three equivalent K1+ and three equivalent Er3+ atoms to form a mixture of edge and corner-sharing TeK3Er3 octahedra. The corner-sharing octahedral tilt angles are 0°.