An investigation of the invariant reactions in BiPbSrCaCuO system

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1996.0273· OSTI ID:383755

Liu, L; Jin, Z ^[1]

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1. Department of Materials Science and Engineering, Central South University of Technology, Changsha, Hunan 410083, People`s Republic of (China)

The phases present around the (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} (2223) phase between 830{endash}880{degree}C have been studied by X-ray diffraction (XRD) and electron probe micro-analysis (EPMA) methods. The decomposition and melting temperatures of the 2223 phase in these samples have been measured by differential thermal analysis (DTA) method. Partial substitution of Bi with Pb (Pb:Bi=3:22) does not change the 850{degree}C phase relations around 2223 phase. 2223 decomposes to liquid, Sr{sub 7}Ca{sub 7}Cu{sub 24}O{sub 41} (7724), and Ca{sub 2}CuO{sub 3} at 875{degree}C. The invariant reactions (degree of freedom is zero) among 2223, 7724, Ca{sub 2}CuO{sub 3}, CuO, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (2212), and liquid were proposed to be: L+7724+Ca{sub 2}CuO{sub 3}{r_arrow}2223+2212, L+7724+Ca{sub 2}CuO{sub 3}{r_arrow}2223+CuO, L+7724{r_arrow}2223 +2212+CuO. The reaction temperatures were estimated to be 860{degree}C, 860{degree}C, and 854{degree}C, respectively. An invariant reaction scheme and a tentatively liquidus projection were sketched out. {copyright} {ital 1996 Materials Research Society.}

• OSTI ID: 383755
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 9 Vol. 11; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
CHEMICAL REACTIONS
COPPER OXIDES
DIFFERENTIAL THERMAL ANALYSIS
HIGH-TC SUPERCONDUCTORS
LEAD OXIDES
PHASE STUDIES
STRONTIUM OXIDES
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES