Preparation of pure Tl2Ba2CuO6±x : the contribution of phase equilibrium studies

The formation of the pure thallium-based cuprate Tl2Ba2CuO6+x (2201) using a convenient process in the ternary TIO1.5-BaO-CuO phase diagram is described. This process is based on the congruent formation of the oxide Tl2Ba2O5 to which CuO is mixed, constituting a quasi-binary system. In the resulting...

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Published in:Physica. C, Superconductivity Superconductivity, 1993-01, Vol.205 (1-2), p.177-185
Main Authors: JORDA, J. L, JONDO, T. K, ABRAHAM, R, COHEN-ADAD, M. T, OPAGISTE, C, COUACH, M, KHODER, A, SIBIEUDE, F
Format: Article
Language:English
Subjects:
Condensed Matter
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
Superconductivity
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container_issue 1-2
container_start_page 177
container_title Physica. C, Superconductivity
container_volume 205
creator JORDA, J. L
JONDO, T. K
ABRAHAM, R
COHEN-ADAD, M. T
OPAGISTE, C
COUACH, M
KHODER, A
SIBIEUDE, F
description The formation of the pure thallium-based cuprate Tl2Ba2CuO6+x (2201) using a convenient process in the ternary TIO1.5-BaO-CuO phase diagram is described. This process is based on the congruent formation of the oxide Tl2Ba2O5 to which CuO is mixed, constituting a quasi-binary system. In the resulting 2201 compound no trace of the main poisoning magnetic impurity BaCuO2 could be detected by AC susceptibility measurements. The orthorhombic to tetragonal transformation is asserted to be due to thallium deficiency which occurs during the heat treatments at a temperature depending on the oxygen partial pressure.
doi_str_mv 10.1016/0921-4534(93)90185-S
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subjects Condensed Matter
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
Superconductivity
title Preparation of pure Tl2Ba2CuO6±x : the contribution of phase equilibrium studies
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