Crystal structures of the three forms of CsZnPO4

Structural investigation of cesium zinc monophosphate CsZnPO4 has been carried out at three different temperatures. At room temperature, this salt is monoclinic, P21/a with a = 18.33(8), b = 5.45(4), c = 9.25(6) Å, β. = 90.14(8)° and Z = 8 (form III):at 260°C, it becomes orthorhombic, Pn21a with a = 9.246(9), b = 5.468(6), c = 9.359(7) Å and Z = 4 (form II),at 310°C, it is orthorhombic Pnma with a = 9.191(5), b = 5.493(5), c = 9.406(5) Å = Z = 4 (form I). Crystal structures of these three forms have been solved and refined with final R values: R = .043 (at room temperature) for 2914 independent reflections, R = .041 (at T = 280°C) for 735 independent reflections, R = .042 (at T = 340°C) for 644 independent reflections.