Abstract
IN the course of an investigation of some cæsium–lead halide compounds, a phase transition has been observed in cæsium plumbochloride (CoPbCl3). This compound may be obtained from plumbous chloride dissolved in a hot aqueous solution of cæsium chloride on cooling1, or simply by melting or sintering cæsium chloride and plumbous chloride together in the correct stoichiometric proportion. The crystals are pale yellow and rectangular in shape. At room temperature they show birefringence under the polarizing microscope. However, on heating, the interference colours change continually and completely disappear at 46.9° C. This phenomenon is reversible; and on cooling, the interference colours appear again in the reverse order. Different types of twin formation can also be observed in these crystals; very common is twinning with (110) as the composition plane.
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References
Wells, H. L., Z. Anorg. Chem., 3, 195 (1893).
Megaw, H. D., Experientia, 2, 183 (1946); Proc. Roy. Soc., A, 189, 261 (1947).
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MØLLER, C. A Phase Transition in Cæsium Plumbochloride. Nature 180, 981–982 (1957). https://doi.org/10.1038/180981a0
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DOI: https://doi.org/10.1038/180981a0
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