NDLI: Phase formation from liquid phase under various post-annealing conditions

Content Provider	IEEE Xplore Digital Library
Author	Nakao, F. Osamura, K.
Copyright Year	2002
Abstract	The process of phase formation from the liquid phase during post-annealing process has been studied precisely using the powder XRD Rietveld analysis. Mass fraction of the liquid phase was estimated to be 9.3% from the sum of phases that formed during post-annealing. Phase conversion from the liquid phase depended strongly on post-annealing temperature and its regime is mainly divided into two patterns. The first is the conversion into (Bi,Pb)2212 and CaPbO/sub 4/ and the second is into (Pb,Bi)3221 and AEC. The former regime was observed during post-annealing at around 1073 K, whereas the latter occurred at around 1053 K. The liquid phase existed at (Bi,Pb)2223 grain boundaries is suggested to limit superconducting current path. The increase of critical current by 1.4 times after post-annealing is closely related with the crystallization of grain boundary liquid.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2450
Ending Page	2453
Page Count	4
File Size	193600
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Powders X-ray scattering Heat treatment Grain boundaries Critical current Crystallization Superconducting materials Chemicals Phase estimation Temperature dependence Rietveld analysis (Bi,Pb)2223 critical current density liquid phase phase conversion post-anneal
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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