Oxygen nonstoichiometry of the YBa 2 Cu 3 O 7- x phase has been determined for between 200 to 850°C and oxygen partial pressure of 1.0 to 3.0×10 -4 atm by thermogravimetric measurements. Values of the partial molar enthalpy of oxygen were estimated. The stable region of the orthorhombic phase was suggested to expand at lower temperatures.
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Yamaguchi et al. (1988) studied this question.
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