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Reaction Mechanisms in the Formation of Lead Zirconate Titanate Solid Solutions under Hydrothermal Conditions
Author(s) -
Cheng Humin,
Ma Jiming,
Zhu Bin,
Cui Yuhong
Publication year - 1993
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.1151-2916.1993.tb03651.x
Subject(s) - crystallite , hydrothermal circulation , lead zirconate titanate , tetragonal crystal system , materials science , phase boundary , phase (matter) , solid solution , mineralogy , zirconate , perovskite (structure) , chemical engineering , analytical chemistry (journal) , crystallography , titanate , crystal structure , ferroelectricity , ceramic , metallurgy , dielectric , chemistry , chromatography , optoelectronics , organic chemistry , engineering
Reaction mechanisms in the formation of PZT solid solution were studied under hydrothermal conditions (Pb/(Zr+Ti) = 1.0 to 1.9, Zr/Ti = 0/10 to 10/0, 1 M to 5 M KOH, 100° to 220°C, 2 h). A yellow tabular crystallite with tetragonal symmetry and Pb/Ti ∼ 2 was formed at 100° to 130°C. A PZT crystallite was formed just above 150°C. The crystallite was a mixture of Ti‐rich PZT and Zr‐rich PZT phases. When the temperature and KOH concentration were increased, the composition of the PZT product tended to be homogeneous. The PZT in the morphotropic phase boundary zone was formed at Zr/Ti = 5/5, 5M KOH, 220°C, 2 h. Neither PbTiO 3 nor PbZrO 3 was detected as a separate phase under the above hydrothermal conditions.