Phase Transitions in CsSnCl3and CsPbBr3. An NMR and NQR Study

Abstract

The phase transitions in CsSnCl3 and CsPbBr3 have been studied by X-ray powder diffraction, by 81Br-NQR and by1H-, 119Sn-, and 113Cs-NMR. At room temperature in air CsSnCI3 forms a hydrate which can be dehydrated to the monoclinic phase II of CsSnCI3. The high temperature phase I has the Perovskite structure, as the X-ray and NMR experiments show. The three phases of CsPbBr3, known from literature, have been corroborated. The results are discussed in the framework of the group ABX3, A = alkalimetal ion, B = IV main group ion, and X = Halogen ion. © 1991, Walter de Gruyter. All rights reserved.