The coefficient of thermal expansion is measured at intervals of 2.5^∘{}C between 200^∘{}C and 500^∘{}C for single and polycrystalline specimens of nickel of varying known degrees of purity. The data yield the value 3.24±{}0.15×{}10^-4 for the ferromagnetic change in volume per unit volume of pure nickel.
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Clarke Williams (1934) studied this question.
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