Monoclinic Low-Temperature Polymorph of Cesium Nitrate

Abstract

A new CsNO₃ polymorph with space group P2₁/c, Z = 4, a = 4.5699(9) Å, b = 11.1871(10) Å, c = 9.1484(18) Å, β = 131.24(3)° has been prepared by crystallization from a mixture of water and DMSO. Flat triangles NO₃ are located in the (010) and (020) planes between the layers formed by coordination polyhedra of Cs atoms in the (040) plane. In contrast to the previously known low-temperature polymorph, the new modification is characterized by the crystal equivalence of all Cs and NO₃ groups.