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short communications
The Bond technique was used to measure the lattice parameter of the red transition-metal oxide, ReO3, as a function of temperature. At 298 K the lattice parameter is 3.7477 (1) Å. The thermal expansion is linear with temperature between 291 and 464 K and a linear coefficient of thermal expansion of 1.1 (1) × 10-6 K-1 was fit to the data.