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Simultaneous Thermogravimetry and Evolved‐Gas Analysis of YBa 2 Cu 3 O 7 and LaBa 2 Cu 3 O 7 Superconductors
Author(s) -
Wada Takahiro,
Yamauchi Hisao,
Tanaka Shoji
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04253.x
Subject(s) - thermogravimetry , analytical chemistry (journal) , impurity , superconductivity , diffraction , evolved gas analysis , powder diffraction , x ray crystallography , materials science , chemistry , mineralogy , crystallography , thermal analysis , thermal , inorganic chemistry , physics , condensed matter physics , organic chemistry , chromatography , meteorology , optics
Concurrent thermogravimetry (TG) and evolved‐gas analysis (EGA) were done for YBa 2 Cu 3 O 7‐z and LaBa 2 Cu 3 ‐O 7‐z superconductors. The sample weights were monitored by thermobalance and the evolved O 2 and CO 2 species were monitored by quadruple mass spectrometer (QMS). No diffraction peak for the impurity phase containing a carbonate group was observed in the X‐ray diffraction patterns for these samples, but the release of CO 2 was detected by EGA. CO 2 gas began to evolve from YBa 2 Cu 3 O 7‐z at 543°C and from LaBa 2 Cu 3 O 7‐z at 692°C. Preparation of high‐quality YBa 2 Cu 3 O 7‐z and LaBa 2 Cu 3 O 7‐z superconductors is discussed on the basis of results of these thermal analyses.