Determination of the thermal expansion of orthorhombic sulfur

The temperature variation of the lattice parameters of orthorhombic sulfur was determined in the range 100 to 300 K using X-ray powder diffractometry. The following equations represent the results: a_T = 10.3506-2.962 × 10^-4T + 2.346 × 10^-6T² Å b_T = 12.8518 - 1.198 × 10^-3T + 4.038 × 10^-6T² Å c_T = 24.1986 + 7.952 × 10^-4T + 9.902 × 10^-7T² Å. Values are given for the thermal expansion coefficients and the Gruneisen parameter.