Thermodynamic and nonstoichiometric behavior of the GdBa2Cu3Ox system

被引：0
作者：
Tetenbaum, M [1 ]
Diana, D [1 ]
Tani, BS [1 ]
Blander, M [1 ]
机构：
[1] Argonne Natl Lab, Div Chem Technol, Argonne, IL 60439 USA
来源：
PROCEEDINGS OF THE FIRST CHINA INTERNATIONAL CONFERENCE ON HIGH-PERFORMANCE CERAMICS | 2001年
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中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Electromotive force (EMF) measurements of oxygen fugacities as a function of stoichiometry have been made on the GdBa2Cu3Ot, system in the temperature range similar to 400-600 degreesC by means of an oxygen titration technique with an yttria-stabilised zirconia electrolyte. Equations for the variation of oxygen partial pressure with composition and temperature have been derived from our EMF measurements. The shape of the 400 degreesC isotherms as a function of oxygen stoichiometry for the Gd and Nd cuprate systems suggests the presence of miscibility gaps at values of x that are higher than those in the YBa2Cu3Ot system. For a given oxygen stoichiometry, oxygen partial pressures above Gd-123 and Nd-123 cuprate systems are higher (above x = 6.5) than that for the Y-123 system. A thermodynamic assessment and inter-comparison of our partial pressure measurements with the results of related measurements will be presented.
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页码：479 / 482
页数：4
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