High-Temperature Elastic Properties of Polycrystalline MgO and Al2O3
- 1 July 1966
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 49 (7), 355-359
- https://doi.org/10.1111/j.1151-2916.1966.tb13283.x
Abstract
Adiabatic bulk modulus, Bs, of polycrystalline MgO and Al2O3 was measured from 298° to 1473°K using the resonance technique. The Grüneisen constant, calculated from the measured bulk modulus, was constant over the whole temperature range (1.53 for MgO and 1.34 for Al2O3). Another important parameter, , is constant at high temperature and is 3.1 for MgO and 3.6 for Al2O3. The Poisson's ratio increases linearly with temperature for MgO and Al2O3. To describe the change of bulk modulus with temperature a theoretical equation was verified by using the foregoing constants. A practical form of this theoretical equation is where Bs0 is the adiabatic bulk modulus at 0°K, δ is the quantity , γ is the Grüneisen constant, H is the enthalpy. The experimental data are described very well by this equation, which is equivalent to the empirical equation suggested by Wachtman et al., BsT= Bs0 - CT exp (-Tc/T), where C and Tc are empirical constants.Keywords
This publication has 12 references indexed in Scilit:
- Derivation of Wachtman's Equation for the Temperature Dependence of Elastic Moduli of Oxide CompoundsPhysical Review B, 1966
- Grüneisen Parameter of Magnesium OxideJournal of Applied Physics, 1966
- Relation of Single‐Crystal Elastic Constants to Polycrystalline Isotropic Elastic Moduli of MgO: II, Temperature DependenceJournal of the American Ceramic Society, 1964
- Temperature Dependence of Elastic Constants of Vitreous SilicaJournal of the American Ceramic Society, 1962
- Temperature variation of the grüneisen parameter in magnesium oxidePhilosophical Magazine, 1962
- Exponential Temperature Dependence of Young's Modulus for Several OxidesPhysical Review B, 1961
- Young's Modulus of Various Refractory Materials as a Function of TemperatureJournal of the American Ceramic Society, 1959
- Thermal properties of aluminum oxide from 0 to 1200 KJournal of Research of the National Bureau of Standards, 1956
- The Temperature Variation of the Elastic Moduli of NaCl, KCl and MgOPhysical Review B, 1936
- The Coefficient of Thermal Expansion of Magnesium OxidePhysics, 1936