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The lattice spacing of cubic barium titanate (BaTiO3) has been measured as a function of temperature by means of a Unicam X-ray camera. The relation between a0 (in Å) and t between 350 °C and 1050 °C is:[Formula: see text]The maximum systematic error in a0 is 0.0005 Å. The linear expansion coefficient varies in an approximately linear fashion between 10.8 × 10−6 per °C at 350 °C to 17.5 × 10−6 = per °C at 1050 °C.
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J. A. C. Bland (1959) studied this question.
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