Abstract
AT normal temperatures, cæsium chloride is stable in a body-centred cubic lattice, and at higher temperatures in a simple face-centred lattice of the sodium chloride type. When single crystals were heated, it was found, using X-ray techniques, that a sharp transition occurred from one form to the other at 469°. Indications were, however, obtained that certain intensities of X-ray reflexions faded exceptionally rapidly on approaching the transition point1. This suggested that lattice defects of some kind might be increasing rapidly in number around the transition temperature. If these defects are of the type associated with ionic conductivity in crystals, a marked increase of electrical conductivity should be observed on passing through the transition point.
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References
Menary, Ubbelohde and Woodward, Proc. Roy. Soc., A, 208, 158 (1951).
Jaffray, J., C.R. Acad. Sci., Paris, 230, 525 (1950).
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HARPUR, W., UBBELOHDE, A. Electrical Conductivity of Cæsium Chloride near the Thermal Transition. Nature 170, 975 (1952). https://doi.org/10.1038/170975a0
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DOI: https://doi.org/10.1038/170975a0
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