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Thermodynamic study at high temperature of the superconducting system YBa2Cu3Oz with 6 <z<7

Published online by Cambridge University Press:  31 January 2011

J. F. Marucco ,
C. Noguera ,
P. Garoche  and
G. Collin
J. F. Marucco
Affiliation:
Laboratoire des Composés non stoechiométriques, CNRS, UA 446, Bât. 415, Université de Paris XI. F-91405 Orsay Cedex, France
C. Noguera
Affiliation:
Dph G/SPAS, CENSACLAY, F-91191 GIF Sur Yvette, France
P. Garoche
Affiliation:
Laboratoire de Physique des Solides, Bât 510, Université de Paris XI, F-91405 Orsay Cedex, France
G. Collin
Affiliation:
Laboratoire de Physique des Solides, Bât 510, Université de Paris XI, F-91405 Orsay Cedex, France
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Abstract

The YBa2Cu3Oz system has been investigated by thermogravimetry in a controlled partial oxygen pressure PO2 ranging from 105-10 Pa. A compound with z = 6.290 was prepared at T = 950°C and PO2 = 105 Pa and identified as a metastable β phase. Subsequent isothermal or isobar phase stability studies were performed. This β phase has a narrow metastability domain 6.25 <z < 6.50 at high temperature. By decreasing the temperature or increasing the PO2, the β phase transforms irreversibly into an α phase characterized by large deviations 7—x from stoichiometry. Near the stoichiometry z = 7, the structure of the a phase is orthorhombic, and fully ionized vacancies are likely to be predominant. By decreasing the PO2, the β phase transforms into a new phase with a lower oxygen content (z < 6.1).

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 6 , December 1987 , pp. 757 - 761
Copyright
Copyright © Materials Research Society 1987

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References

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