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Mass Transport and Chemical Demixing of Y‐Ba‐Cu‐O Compounds During Sintering in Temperature Gradients
Author(s) -
Rahaman Mohamed N.,
De Jonghe Lutgard C.,
Chu MayYing
Publication year - 1988
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.1151-2916.1988.tb05066.x
Subject(s) - eutectic system , sintering , temperature gradient , materials science , analytical chemistry (journal) , phase (matter) , mass transport , high temperature superconductivity , chemical composition , concentration gradient , stoichiometry , superconductivity , mineralogy , microstructure , chemistry , metallurgy , chromatography , condensed matter physics , physics , organic chemistry , engineering physics , quantum mechanics , engineering
A thin cylindrical powder compact (3‐mm diameter by 20‐mm) with a nominal composition of YBa 2 Cu 3 O x was sintered in a static temperature gradient of 25°C/mm in air for 12 h. The temperature at the hot end of the sample was maintained at 940°±5°C. Considerable mass transport and chemical demixing occurred along the length of the sample. The results are consistent with the formation of a liquid phase at the hot end of the sample, transport of the liquid down the temperature gradient, and the formation of different eutectic compositions along the length of the sample. The implications for processing high‐T c superconductors in the system Y‐Ba‐Cu‐O are discussed.