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Thermal Expansion and Oxygen Nonstoichiometry in High‐ T c YBa 2 Cu 3 O x Superconductor
Author(s) -
Olekhnovich N. M.,
Zhabko T. E.,
Orlova N. S.,
Janovich V. D.,
Pashkovskii O. I.,
Zykova T. L.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260614
Subject(s) - thermal expansion , superconductivity , anisotropy , oxygen , ceramic , oxide , materials science , lattice (music) , thermal , lattice constant , transition temperature , analytical chemistry (journal) , chemistry , condensed matter physics , thermodynamics , composite material , metallurgy , chromatography , diffraction , organic chemistry , physics , quantum mechanics , acoustics , optics
The lattice parameters as well as the axial thermal expansion coefficients for YBa 2 Cu 3 O x superconducting oxide ceramics with different oxygen content ranging from × = 6.14 to × = 6.95 are determined as a function of temperature between 80 and 400 K using X‐ray powder diffractometry technique. The effect of oxygen concentration on the thermal expansion behaviour is regarded. The values of α are found to decrease with the oxygen content reducing and depend on the condition of heat treatment. The essential anisotropy of thermal expansion is shown to exist, with α c being larger than α a and α b . The relationship between α a and α b depends both on the sample preparation conditions and temperature.