Effect of Oxygen Loss on Densification When Hot Isostatic Pressing YBa 2 Cu 3 O 7−δ

Hot isostatic pressing of the high‐T c superconductor YBa 2 Cu 3 O 7−δ can lead to loss of oxygen and transformation of the material from the high‐T c orthorhombic phase to the nonsuperconducting tetragonal phase. It is shown that glass encapsulation helps retain the orthorhombic structure, whereas...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1989-08, Vol.72 (8), p.1508-1510
Main Authors: Niska, John, Loberg, Bengt, Easterling, Kenneth
Format: Article
Language:English
Subjects:
Engineering Materials
Materialteknik
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Summary:Hot isostatic pressing of the high‐T c superconductor YBa 2 Cu 3 O 7−δ can lead to loss of oxygen and transformation of the material from the high‐T c orthorhombic phase to the nonsuperconducting tetragonal phase. It is shown that glass encapsulation helps retain the orthorhombic structure, whereas steel encapsulation resulted in formation of the tetragonal phase. Reasons for this phenomenon are discussed. The equilibrium oxygen gas pressure for the oxygen decomposition reaction in YBa 2 Cu 3 O 7 , however, prevents full densification of this material in glass when employing hot isostatic pressing conditions of 200 MPa and 845°C.
ISSN:0002-7820
1551-2916
1551-2916
DOI:10.1111/j.1151-2916.1989.tb07691.x