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The lattice parameters of Ni3AI have been determined accurately for the temperature range 25 to 594 "C by a high-temperature x-ray powder diffraction method. These data are used to evaluate the coefficients of thermal expansion at various tmperatures. The thermal expansion of Ni3AI has also been measured from 25 to 1000 "C by a dilation method. The thermal expansion values obtained by the dilation method are in good agreement with those determined by the x-ray diffraction method at around room temperature, but the agreement deteriorates with increase in temperature.

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