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Thermodynamic studies of the orthorhombic–tetragonal transition in Ba2YCu3O7−δ (1988)

Lo, W. ; Tang, Tong B. ; Li, Chaorui ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 53 (1988), S. 2710-2712

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: The superconducting oxide Ba2YCu3O7−δ is known to exist in two crystallographic structures, being orthorhombic or, at higher temperature, tetragonal. Thermogravimetric experiments have been performed to study their transition at different oxygen partial pressures. Weight loss curves, recorded by heating samples at various constant rates, each exhibit two inflection points. In our interpretation, such points delimit the regime within which the two structural phases coexist. Limiting values of temperature at these points, calculated by extrapolation to zero heating rates, and the corresponding magnitudes of oxygen nonstoichiometry are presented. Such data have basic significance as well as relevance to the thermal processing of materials.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.100553

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