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An investigation of the invariant reactions in the BiPbSrCaCuO system

Published online by Cambridge University Press:  31 January 2011

Libin Liu  and
Zhanpeng Jin
Libin Liu
Affiliation:
Department of Materials Science and Engineering, Central South University of Technology, Changsha, Hunan 410083, People's Republic of China
Zhanpeng Jin
Affiliation:
Department of Materials Science and Engineering, Central South University of Technology, Changsha, Hunan 410083, People's Republic of China
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Abstract

The phases present around the (Bi, Pb)2Sr2Ca2Cu3Ox (2223) phase between 830–880 °C have been studied by x-ray diffraction (XRD) and electron probe microanalysis (EPMA) methods. The decomposition and melting temperatures of the 2223 phase in these samples have been measured by the differential thermal analysis (DTA) method. Partial substitution of Bi with Pb (Pb: Bi = 3: 22) does not change the 850 °C phase relations around 2223 phase. 2223 decomposes to liquid, Sr7Ca7Cu24O41 (7724), and Ca2CuO3 at 875 °C. The invariant reactions (degree of freedom is zero) among 2223, 7724, Ca2CuO3, CuO, Bi2Sr2CaCu2O8 (2212), and liquid were proposed to be L + 7724 + Ca2CuO3 → 2223 + 2212, L + 7724 + Ca2CuO3 → 2223 + CuO, L + 7724 → 2223 + 2212 + CuO. The reaction temperatures were estimated to be 860 °C, 860 °C, and 854 °C, respectively. An invariant reaction scheme and a tentative liquidus projection were sketched out.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 9 , September 1996 , pp. 2142 - 2151
Copyright
Copyright © Materials Research Society 1996

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