Abstract
A large volume belt-type or girdle-type high pressure apparatus is generally used for materials synthesis at high pressure and high temperature conditions. In this article, pressure correction at high temperatures in these apparatuses was reviewed. Nominal pressures were determined at room temperature using the pressure-induced phase transitions such as Bi, Tl, Ba and Sn. Practical pressures at high temperatures were estimated from measured phase boundaries such as the melting curve of Ag and the equilibrium boundary of coesite-stishovite in a belt-type apparatus. It was clear from the correction that the pressure difference between the nominal pressure and the practical one was strongly dependent on pressure transmitting media. Also, various technical problems of high temperature generation and internal standard for pressure and temperature estimation are discussed.
