A high-temperature equation of state (EoS) for alpha-alumina (corundum) with a hexagonal close-packed (hcp) lattice was derived herein using experimental data on the thermodynamic properties, thermal expansion, compressibility and temperature-dependent bulk compression modulus. The experimental data were co-optimized using the temperature-dependent Tait equation over a pressure range from 0 to 1677 kbar and over a temperature range from 20 to 2327 K. The temperature dependence of thermodynamic and thermophysical parameters was fitted by an extended Einstein model. For the Tait equation, the isothermal bulk compression modulus and its pressure derivative at 0 K were estimated to be 2570.3 kbar and 4.1944, respectively. The temperature derivative of the bulk compression modulus was estimated to be 2.10·10^–4 K^–1. The obtained EoS provides a good fit to the whole set of the experimental data within the measurement error of individual parameters.

本文使用热力学性质、热膨胀、压缩性和温度相关的体积压缩模量的实验数据推导了具有六方密堆积 (hcp) 晶格的 α-氧化铝（刚玉）的高温状态方程 (EoS)。在 0 至 1677 kbar 的压力范围和 20 至 2327 K 的温度范围内，使用温度相关的 Tait 方程对实验数据进行协同优化。热力学和热物理参数的温度依赖性通过扩展的爱因斯坦模型进行拟合。对于 Tait 方程，等温体积压缩模量及其在 0 K 时的压力导数估计分别为 2570.3 kbar 和 4.1944。体积压缩模量的温度导数估计为2.10·10 ^–4  K ^–1。获得的EoS在各个参数的测量误差范围内与整组实验数据很好地拟合。