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Dependence of Grain Shape and Growth on PT Content in PbO‐Excess PMN–PT
Author(s) -
Seo Chang Eui,
Yoon Duk Yong,
Wallace Jay S.,
Blendell John E.
Publication year - 2006
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.1551-2916.2006.00938.x
Subject(s) - grain growth , grain size , materials science , sharpening , content (measure theory) , mineralogy , crystallography , analytical chemistry (journal) , chemistry , metallurgy , mathematics , chromatography , computer science , computer vision , mathematical analysis
When Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) with 40 wt% excess PbO is sintered at 1050°C, the grains grow normally and have flat {100} surface segments with round edges. As PbTiO 3 (PT) is added up to 8 mol%, the grain growth is still nearly normal, characterized by time invariant normalized size distributions, but the grain edges become more sharply curved. This normal growth behavior is consistent with relatively small surface step free energy as indicated by the round grain edges. As the PT content is increased above 10–35 mol%, the grain edges become sharp and abnormal grain growth occurs. This is consistent with the step free energy increasing with the PT content as indicated by the sharpening grain edges.