Oxygen Content and Phase Diagram of the High-T_c Superconductor Ba_2ErCu_3O_y : Electrical Properties of Condensed Matter
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概要
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The oxygen content of Ba_2ErCu_3O_y was determined by both thermogravimetric measurement and iodometric titration analysis. Four distinct regions were found in the diagram of log P_<O_2> -1 / T plots. These regions were proposed to correspond to : the first orthorhombic phase (O_I), the second orthorhombic phase (O_<II>), the tetragonal phase (T) and the coexistence of two phases. The partial molar enthalpy of oxygen, ΔH^^-_<O_2>, was obtained as -194±6kJ / mol for the O_I phase, -166±4kJ / mol for the O_<Ii> phase and -142+4kJ / mol for the T phase. A pseudobinary phase diagram was proposed based on the log P_<O_2> -1 / T plots, quenching investigation and high-temperature X-ray diffraction analysis.
- 社団法人応用物理学会の論文
- 1988-07-20
著者
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NAKAMURA Tetsuro
Research Institute of Aging Science
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Liang R
Research Laboratory Of Engineering Materials Tokyo Institute Of Technology
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Liang Ruixing
Research Laboratory Of Engineering Materials Tokyo Institute Of Technology
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