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Isothermal Grain Growth of Pressure‐Sintered PLZT Ceramics
Author(s) -
LANGMAN RICHARD A.,
RUNK ROBERT B.,
BUTLER SIDNEY R.
Publication year - 1973
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.1151-2916.1973.tb12530.x
Subject(s) - materials science , sintering , grain growth , isothermal process , ceramic , impurity , activation energy , grain size , grain boundary , analytical chemistry (journal) , mineralogy , composite material , metallurgy , microstructure , thermodynamics , chemistry , physics , organic chemistry , chromatography
PLZT specimens 99.99% of theoretical density containing 7 at.% La with a 65/35 Zr/Ti atom ratio were fabricated with average grain diameters of ∼1 μm by pressure sintering. The dense, single‐phase specimens were isothermally heat‐treated in a low PbO activity atmosphere. For grain diameters from 1 to 5 μm, grain growth obeyed the D 3 ‐D 0 3 =k't relation, with an apparent activation energy of 86 kcal/mol. The mechanism controlling the grain‐growth rate is consistent with a solid‐solution impurity drag caused by an La ion concentration gradient near the grain boundaries.