Thermal Expansion of LaCoO_3

摘要

High-temperature X-ray diffraction （HTXRD） measurements of LaCoO3 powder was carried out in a temperature range from 298 to 1273 K. The experimental data obtained were adopted to evaluate the lattice parameters and cell volume. In this temperature range, the linear and volume expansion coefficients calculated using these cell parameters are 24.160～23.610×10-6·K-1 and 59.601～63.218×10-6·K-1 respectively. There is no discontinuity found in the cell parameters through the proposed first-order transition at 1210 K.