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Thermodynamics and Phase Equilibria in the Ca─Cu─O System
Author(s) -
Suzuki Ryosuke O.,
Bohac Petr,
Gauckler Ludwig J.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb06955.x
Subject(s) - electromotive force , thermodynamics , gibbs free energy , phase diagram , ternary operation , partial pressure , ternary numeral system , electrolyte , chemistry , phase (matter) , emf measurement , chemical stability , atmospheric temperature range , analytical chemistry (journal) , oxygen , physics , organic chemistry , electrode , quantum mechanics , chromatography , computer science , programming language
Phase equilibria in the CaO─CuO─Cu system were determined at 1173 K from the results of X‐ray diffraction measurements using specimens annealed in the oxygen partial pressure range from P O 2 = 1 to 10 −8 atm. Electromotive force (emf) measurements using ZrO 2 solid electrolyte cells were carried out in the ternary phase equilibria. Gibbs free energies for the chemical reactions were summarized by equations with linear temperature dependence, and the standard free energy of formation for Ca 2 CuO 3 was derived. The stability conditions of the oxides are displayed in the p – T – x diagram, and the possible phase equilibria with the liquid are evaluated.