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Effect of Heating Rate on the Dielectric Properties of the PMN‐PT Relaxor Ceramics
Author(s) -
Liou YiCheng,
Wu Long
Publication year - 1994
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.1151-2916.1994.tb04579.x
Subject(s) - materials science , dielectric , ceramic , sintering , microstructure , perovskite (structure) , mineralogy , phase (matter) , composite material , analytical chemistry (journal) , evaporation , chemical engineering , thermodynamics , chemistry , chromatography , physics , optoelectronics , organic chemistry , engineering
The effect of heating rate (2 to 30°C/min) during sintering on the perovskite phase content, density, microstructure, and dielectric properties of 0.9PbMg 1/3 Nb 2/3 O 3 –0.1PbTiO 3 relaxor ferroelectric ceramics has been studied. Increasing the heating rate reduced the level of PbO evaporation and resulted in high perovskite content and dense ceramics. With slow heating rate (2–10°C/min), excess MgO segregated as isolated submicrometer particles in the perovskite grains; these precipitates were absent in ceramics sintered with a heating rate of 30°C/min. The maximum dielectric constant was optimized with a heating rate of 10°C/min. The temperature of maximum dielectric constant shifted downward as the heating rate was increased.