Determination of the Orthorhombic-Tetragonal YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> Phase Boundary in the δ-T Diagram
Yoshimi KuboFundamental Research Laboratories, NEC CorporationY. NakabayashiFundamental Research Laboratories, NEC CorporationJunji TabuchiFundamental Research Laboratories, NEC CorporationTsutomu YoshitakeFundamental Research Laboratories, NEC CorporationAtsushi OchiFundamental Research Laboratories, NEC CorporationKazuaki UtsumiFundamental Research Laboratories, NEC CorporationHitoshi IgarashiFundamental Research Laboratories, NEC CorporationMasatomo YonezawaFundamental Research Laboratories, NEC Corporation
1987en
ABI
Abstract
The orthorhombic-tetragonal YBa 2 Cu 3 O 7-δ phase boundary in the δ- T diagram was determined by a detailed isobar TG measurement under the oxygen partial pressures of 1 to 0.01 atm. The phase boundary was found not to be located at δ = const., but to have a slope of dδ/d T ∼-4.7×10 -4 K -1 . The experimental results are discussed with a simple order-disorder transformation model of oxygen atoms on the Cu plane sandwiched by Ba planes.
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