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Mechanism for the Peritectic Reaction and Growth of Aligned Grains in YBa 2 Cu 3 O 6+ x
Author(s) -
Bateman Charles A.,
Zhang Lijie,
Chan Helen M.,
Harmer Martin P.
Publication year - 1992
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.1151-2916.1992.tb05572.x
Subject(s) - supercooling , nucleation , materials science , microstructure , dissolution , precipitation , mechanism (biology) , thermodynamics , reaction mechanism , mineralogy , crystallography , chemical physics , chemical engineering , metallurgy , chemistry , catalysis , physics , quantum mechanics , biochemistry , meteorology , engineering
It is experimentally observed that the peritectic reaction, 211 + liquid → 123, can be driven essentially to completion in 1 h at an undercooling of only ∽30°C. The kinetic data, together with the observed microstructures, are inconsistent with the normal mechanism of the peritectic reaction. It is proposed that the mechanism of the reaction involves dissolution of 211 particles into the liquid and precipitation of solid 123. The aligned grain structure is explained through sympathetic nucleation of new 123 grains on existing grains.