Phase coexistence and critical temperatures of the (Bi, Pb)2Sr2Ca2Cu3Ox phase under partial pressures of oxygen between 10−3 and 0.21 bar with and without additions of silver

Daumling, Manfred; Maad, R.; Jeremie, Andréa; Flukiger, René-Louis

doi:10.1557/JMR.1997.0198

Scientific article

Open access

English

Phase coexistence and critical temperatures of the (Bi, Pb)₂Sr₂Ca₂Cu₃Ox phase under partial pressures of oxygen between 10−3 and 0.21 bar with and without additions of silver

ContributorsDaumling, Manfred; Maad, R.; Jeremie, Andréa; Flukiger, René-Louis

Published inJournal of Materials Research, vol. 12, no. 06, p. 1445-1450

Collection

Open Access - Licence nationale Cambridge University Press

Publication date1997

Abstract

We have investigated the stability of the (Bi, Pb)2Sr2Ca2Cu3Ox phase for the stoichiometry (Bi: Pb: Sr:Ca: Cu = 1.72: 0.34: 1.83: 1.97: 3.13), subjecting it to temperatures between 700 and 850 °C under various oxygen partial pressures. A narrow region was found in which Bi, Pb(2223) was the only superconducting phase. This region follows closely the thermal decomposition line. X-ray pure Bi, Pb(2223) will partially decompose if treated outside of the stability region. For a given oxygen partial pressure, the Bi, Pb(2223) phase tends to coexist with the 2201 phase for temperatures above, and the 2212 phase for temperatures below this region. At even lower temperatures an additional lead-rich phase appears. Critical temperatures Tc vary little with treatment and range between 108.5 K and 110.8 K. If 10% silver is added to the starting powder, the phase coexistence regions shift. Silver does not seem to have a significant effect on the absolute values of the critical temperature. The Bi, Pb(2223) thermal decomposition temperature for a given oxygen pressure is lowered by at least 10 K by the presence of Ag.

Affiliation

Faculté des sciences / Section de physique / Département de physique de la matière quantique

Citation (ISO format)

DAUMLING, Manfred et al. Phase coexistence and critical temperatures of the (Bi, Pb)2Sr2Ca2Cu3Ox phase under partial pressures of oxygen between 10−3 and 0.21 bar with and without additions of silver. In: Journal of Materials Research, 1997, vol. 12, n° 06, p. 1445–1450. doi: 10.1557/JMR.1997.0198

Article (Published version)

OA NATIONAL

Identifiers

PID : unige:102702
DOI : 10.1557/JMR.1997.0198

Commercial URLhttp://www.journals.cambridge.org/abstract_S0884291400039935

ISSN of the journal2044-5326

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Phase coexistence and critical temperatures of the (Bi, Pb)2Sr2Ca2Cu3Ox phase under partial pressures of oxygen between 10−3 and 0.21 bar with and without additions of silver

Technical informations

Phase coexistence and critical temperatures of the (Bi, Pb)₂Sr₂Ca₂Cu₃Ox phase under partial pressures of oxygen between 10−3 and 0.21 bar with and without additions of silver