酸化物の相平衡に及ぼす不活性ガス圧の影響

概要

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Phase stability of Y-Ba-Cu-O superconducting phase was evaluated as a function of temperature, oxygen partial pressure and total gas pressure by the hot isostatic pressing method using argon and oxygen mixtures as a surrounding stmosphere. The phase transformation temperature from Y_2Ba_4Cu_7O_y to YBa_2Cu_4O_8 increased with increasing the total gas pressure, even if the oxygen partial pressure was kept constant. It indicates that the equilibrium partial pressure of a gas involving the chemical reaction changes if a solid-gas reaction is progressed under high total gas pressure. Dependence of chemical potential of the reactant gas on the inert gas pressure was thermodynamically discussed on the basis of Lewis-Randall's empirical scaling law and Ishizaki's approximation. These two approximations resembled each other at pressures less than the usual HIPing pressure.
社団法人日本セラミックス協会の論文
1999-08-01