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Liquid Formation at the Peritectic Temperature in Superconducting YBa 2 Cu 3 O 7−x —Observation of a New Phase YBa 4 CuAIO 8
Author(s) -
Zhou JiPing,
Sorrell Charles C.,
Bourdillon Antony J.,
Dou ShiXue
Publication year - 1990
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.1151-2916.1990.tb05291.x
Subject(s) - tetragonal crystal system , stoichiometry , superconductivity , materials science , high temperature superconductivity , phase (matter) , crystal structure , inorganic compound , lattice constant , critical current , analytical chemistry (journal) , mineralogy , crystallography , condensed matter physics , chemistry , diffraction , physics , organic chemistry , chromatography , optics
In the system Y‐Ba‐Cu‐O, partial melting of peritectically decomposing YBa 2 Cu 3 O 7‐ x (123) was used to produce a bulk material of high critical current density when the material was aligned. The liquid formation mechanism and its relation to reaction with alumina refractory was studied. A previously unreported phase of the approximate stoichiometric ratio Y:Ba:Cu:Al = 1:4:1:1 (YBa 4 CuAlO 8 ) was detected. The crystal structure was determined to be tetragonal, with lattice parameters a 0 = b 0 = 1.651 nm, c 0 = 1.793 nm. The 1411 phase bears a close structural relationship to BaCuO 2 .