Abstract
In high temperature and high pressure experiments, it is essential to have a reliable pressure calibration standard over a wide temperature and pressure range. The Au pressure scales reported by Jamieson et al.(1982), Anderson et al.(1989), and Shim et al.(2002), and the MgO pressure scales by Jamieson et al.(1982), Matsui et al.(2000), and Speziale et al.(2001) have recently been often used to estimate pressure at high temperatures in both diamond-anvil and multi-anvil experiments. Detailed description and criticism will be made for each of these pressure scales at high temperatures in relation to the physical properties of the deep earth.In addition, the electronic thermal pressure of Au at high temperatures and high pressures are calculated using the uniform electron gas model with the random-phase approximation(Kanhere et al., 1986) for the exchange-correlation potential, in order to estimate the contribution of the electronic thermal pressure to the total pressure at the temperatures and pressures conditions found in multi-anvil, laser heated diamond-anvil experiments, or shock compression measurements of Au.
