Inert Gas Pressure Effects on Phase Stability of Oxides

Autor:	Yoshiyuki Yasutomi, Yuichi Sawai, Makoto Nanko
Rok vydání:	1999
Předmět:	Materials science Vapor pressure Vapour pressure of water Buffer gas Thermodynamics General Chemistry Partial pressure Condensed Matter Physics Volume (thermodynamics) Materials Chemistry Ceramics and Composites Fugacity Compressibility factor Inert gas
Zdroj:	Scopus-Elsevier
ISSN:	1882-1022 0914-5400
DOI:	10.2109/jcersj.107.738
Popis:	Phase stability of Y-Ba-Cu-O superconducting phases 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 atmosphere. The phase transformation temperature from Y2Ba4Cu7Oy to YBa2Cu4O8 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6b53294d13a5332051bc18ab2e4708c https://doi.org/10.2109/jcersj.107.738 Zobrazit plný text záznamu