Zur Struktur der Selenide Cs2Pd3Se4, Rb2Pd3Se4 und K2Pd3Se4 / On the Crystal Structure of Cs2Pd3Se4, Rb2Pd3Se4, and K2Pd3Se4

Abstract

The ternary selenides Cs2Pd3Se4, Rb2Pd3Se4 and K2Pd3Se4 have been prepared by fusion reactions of alkali carbonates with palladium and selenium at 850°C. According to X-ray powder patterns (Guinier-Simon technique) Cs2Pd3Se4 is monoclinic with α= 6,493 Å, b =14,204Å, c = 6,414Å, β=120,41° and is isotypic with Cs2Pd3S4 (C 2/m, No. 12). Rb2Pd3Se4 and K2Pd3Se4 are orthorhombic and isotypic with K2Pd3S4 (Fddd, No. 70). Rb2Pd3Se4: α=11,076 Å, b = 27,092 Å, c= 6,353 Å; K2Pd3Se4: a= 10,954 Å, b = 26,196 A, c = 6,317 Å.