Abstract
The cell dimensions of β-rhombohedral boron have been measured in the temperature range 10–1273 K, using X-ray diffraction. The linear thermal expansion coefficients ( α l =( l− l 298)/ l 298 ( T− T 298)) were determined along the a and c directions. It was found that β- rhombohedral boron is anisotropic, displaying a significantly larger thermal expansion coefficient in the c direction than in the a direction. The average linear thermal expansion coefficient is 6.4×10 −6 K −1 in the temperature range 293–1023 K.
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