Thermal decomposition and chemical interactions observed by mass spectrometry of Y-Ba-Cu-O superconductors

Wahlbeck, P. G.; Myers, Dwight L.; Ho, J. C.

doi:10.1016/0921-4534(89)90127-5

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B Reduction and Melting1

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1997

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Cited by 11 publications

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“…[516] this excess of Cu on the grain boundaries causes a formation of a peritectic liquid which in turn results in a partial phase separation upon cooling. Vaporization studies [517,518] have shown measurable partial pressures of both Cu and Ba species over YBa2Cu306+w at temperatures around melting. At 890~ vapor pressure values (in Pa) of 1.2.10 -4 for Cu, 2.2.10 -5 for CuO and 2.5.10 -5 for BaO under 21 kPa of oxygen are obtained in Ref.…”

Section: B Reduction and Meltingmentioning

confidence: 98%

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Karen

Kjekshus

1997

Journal of Thermal Analysis

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Phase diagrams for cupratcs of alkaline earth and rare earth elements are presented, covering binary to quintenary oxides and including selected solid solution series with other elements. Elementary crystal chemical data are included for identification of the occurring phases. Chemical stability is discussed with respect to the high-temperature reactions with Lewis acids like CO2, protons, etc. Particularly the occurrence of oxide carbonates is consistently pointed out as one of the possible reasons for contradictory results in phase diagrams which comprise oxides with high basicity.

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Section: B Reduction and Meltingmentioning

confidence: 98%