Ternäre Phosphide mit ThCr 2 Si 2 -Struktur / Ternary Phosphides with the ThCr 2 Si 2 Structure

Abstract

Ten new compounds with the general formula AB 2 P 2 (A = Ca, Sr, Eu, Ba; B = Cu, Ni, Co, Fe, Mn) have been prepared and their structures determined. They are isotypic and crystallize in the ThCr 2 Si 2 structure (space group I4/mmm) with the following constants: CaCu 1.75 P 2 a = 401.4 1 pm, c = 962.7(1) pm CaNi 2 P 2 a = 391.6 1 pm, c = 936.3(1) pm CaCo 2 P 2 a = 385.8 1 pm, c = 959.3(1) pm CaFe 2 P 2 a = 385.5 1 pm, c = 998.5(1) pm SrCu 1.75 P 2 a = 416.6 1 pm, c = 960.7(1) pm EUCU 1.75 P 2 a = 411.0 1 pm, c = 959.1(1) pm SrCo 2 P 2 a = 379.4 1 pm, c = 1161.0(1) pm SrFe 2 P 2 a = 382.5 1 pm, c = 1161.2(1) pm BaFe 2 P 2 a = 384.0 1 pm, c = 1244.2(1) pm BaMn 2 P 2 a = 403.7 1 pm, c = 1306.1(1) pm While in Ca(Sr,Eu)Cu 1.75 P 2 the P atoms form pairs, they are isolated from each other in the other compounds.