CS2AG2ZRTE4 - A NEW LAYERED TELLURIDE CONTAINING TETRAHEDRALLY COORDINATED ZIRCONIUM

摘要

The compound Cs2Ag2ZrTe4 was synthesized through reaction of the elements in a Cs2Te3/Te flux at 900 degrees C. The compound crystallizes in the orthorhombic space group D-2(6) - C222 with two formula units in a cell of dimensions a = 6.508(7) Angstrom, b = 15.164(16) Angstrom, c = 6.518(6) Angstrom, V = 643.2(11) Angstrom(3) at 113 K. The structure has been refined to a value of R(w)(F-0(2)) of 0.111 for 1138 data and 24 variables; the value of R(1) (on F) is 0.053. The Cs-2- Ag2ZrTe4 structure comprises two-dimensional slabs of Ag- and Zr-centered tetrahedra separated by Cs+ cations. This appears, to be the first example of the tetrahedral coordination of Zr4+ by chalcogen anions in a solid-state compound. [References: 28]