Thermomechanical Measurements of Lead Halide Single Crystals

The linear thermal expansion of lead halide (PbCl2, PbBr2, PbI2) crystals was measured between room temperature and their melting points. Using the temperature dependence of linear thermal expansion Δl/l, the coefficients of linear thermal expansion α and their temperature dependencies were calculated and the results presented. The thermal expansion of compounds such as CuCl, CsPbCl3, CsPbBr3 and RbPbCl3 was also measured and the changes in α were used in the study of polymorphism in lead halides.