Lattice parameter and thermal expansion of CsCl and CsBr by x-ray powder diffraction. II. Thermal expansion of CsBr from room temperature to 78.2 °K
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The lattice parameters of CsBr at eight different temperatures from room temperature to 78.2 °K were measured and the true lattice parameters were obtained by the least squares method using the Nelson-Riley extrapolation function. Using these parameters the thermal expansion coefficients of CsBr were estimated at each temperature by fitting them into a cubic polynomial involving temperatureT. Theα T thus obtained were compared with the values of earlier workers who used an interferometric technique and the agreement was found to be good.
KeywordsNelson-Riley extrapolation thermal expansion caesium bromide powder diffraction lattice parameter cryostat
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