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Transition Temperatures for the Tetragonal‐Orthorhombic Phase Transition in the 123 Superconductor
Author(s) -
Wang Hong,
Li Dong X.,
Thomson William J.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb07550.x
Subject(s) - tetragonal crystal system , orthorhombic crystal system , phase transition , hysteresis , materials science , transition temperature , superconductivity , oxygen , condensed matter physics , diffraction , analytical chemistry (journal) , chemistry , crystallography , crystal structure , optics , physics , chromatography , organic chemistry
Transition temperatures for the reversible orthorhombic‐tetragonal phase transition in the “123′’superconductor have been measured using dynamic X‐ray diffraction. Results are reported for heating/cooling rates up to 180°C/min and in oxygen partial pressures from 3.2 to 21 kPa and are consistent with a rapid second‐order (order‐disorder) transition. In air and at cooling rates ≤12°C/min, the transition is perfectly reversible with no detectable hysteresis. At higher heating or cooling rates and at lower oxygen pressures the transition has a definite hysteresis and a measurable dependence on time.