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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3765

Title: THE DECOMPOSITION OF THE OXALATE PRECURSOR AND THE STABILITY AND REDUCTION OF THE YBA2CU4O8 SUPERCONDUCTOR STUDIED BY TG COUPLED WITH FTIR AND BY XRD
Authors: MULLENS, Jules
VOS, A
DE BACKER, An
FRANCO, Dirk
YPERMAN, Jan
VAN POUCKE, Lucien
Issue Date: 1993
Publisher: JOHN WILEY & SONS LTD
Citation: JOURNAL OF THERMAL ANALYSIS, 40(1). p. 303-311
Abstract: The 124 superconductor YBa2Cu4O8 was prepared from the oxalate precursor Y2(C2O4)3.4BaC2O4.8CuC2O4.xH2O at one atmosphere oxygen pressure. In 02 the precursor decomposes in one stop at 300-degrees-C and mom gradually (300-degrees-600-degrees-C) in Ar. The stability of the superconductor is strongly dependent on the gas atmosphere: in 02 and in air them is no significant weight change as long as the temperature does not exceed 800-degrees-C, whereas in & 1% 02-99% N2 mixture decomposition starts at about 670-degrees-C with the formation of CuO and YBa2Cu3Ox with x<7. The reduction of YBa2Cu4O8 in a 5% H-2-95% Ar mixture takes place in at least four major steps with formation of products such ag Y2O3, BaO, Cu2O, Cu, BaY2O4 and Ba4Y2O7.
Notes: MULLENS, J, LIMBURGS UNIV CENTRUM,INST MAT RES,INORGAN & PHYS CHEM LAB,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3765
ISI #: A1993LT31000031
ISSN: 0368-4466
Type: Journal Contribution
Appears in Collections: Research publications

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