Simultaneous thermogravimetry and evolved-gas analysis of YBa sub 2 Cu sub 3 O sub 7 and LaBa sub 2 Cu sub 3 O sub 7 superconductors

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb04253.x· OSTI ID:7297487

Wada, T; Yamauchi, H; Tanaka, S ^[1]

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1. Superconductivity Research Lab., International Superconductivity Technology Center, Tokyo 135 (JP)

Concurrent thermogravimetry (TG) and evolved-gas analysis (EGA) were done for YBa{sub 2}Cu{sub 3}O{sub 7{minus}z} and LaBa{sub 2}Cu{sub 3}-O{sub 7{minus}z} superconductors. The sample weights were monitored by thermobalance and the evolved O{sub 2} and CO{sub 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{sub 2} was detected by EGA. CO{sub 2} gas began to evolve from YBa{sub 2}Cu{sub 3}O{sub 7{minus}z} at 543{degrees}C and from LaBa{sub 2}Cu{sub 3}O{sub 7{minus}z} at 692{degrees}C. In this paper preparation of high-quality YBa{sub 2}Cu{sub 3}O{sub 7{minus}z} and LaBa{sub 2}Cu{sub 3}O{sub 7{minus}z} superconductors is discussed on the basis of results of these thermal analyses.

• OSTI ID: 7297487
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:6; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
664200 -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
665412* -- Superconducting Devices-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
COHERENT SCATTERING
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
GRAVIMETRIC ANALYSIS
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
MASS SPECTRA
NONMETALS
NUCLEAR QUADRUPOLE RESONANCE
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
RESONANCE
SCATTERING
SPECTRA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS