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Enhanced Dielectric and Ferroelectric Properties of Pb ( Mg 1/3 Nb 2/3 ) 0.65 Ti 0.35 O 3 Ceramics by ZnO Modification
Author(s) -
Promsawat Methee,
Watcharapasorn Anucha,
Ye ZuoGuang,
Jiansirisomboon Sukanda
Publication year - 2015
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/jace.13372
Subject(s) - ferroelectricity , materials science , dielectric , tetragonal crystal system , curie temperature , analytical chemistry (journal) , ceramic , microstructure , mineralogy , ferroelectric ceramics , doping , crystallography , crystal structure , condensed matter physics , composite material , chemistry , optoelectronics , chromatography , physics , ferromagnetism
Phase formation, microstructures, dielectric, and ferroelectric properties of ZnO‐modified Pb(Mg 1/3 Nb 2/3 ) 0.65 Ti 0.35 O 3 (PMNT/ x ZnO, where x = 0, 0.4, 2.0, 4.0, and 11.0 mol%) ceramics were studied. A coexistence of rhombohedral and tetragonal ferroelectric phases was observed at room temperature in all samples. The ceramics with the relative densities of 93%–95% were prepared. The modification by ZnO led to an increase in grain sizes of PMNT ceramics. The maximum dielectric constant of the pure PMNT ceramic was increased with x = 0.4–4.0 mol% ZnO doping, with the highest value being observed in the 2.0 mol% sample. Both the temperature at which the transition between rhombohedral and tetragonal ferroelectric phases took place ( T R‐T ) and the Curie temperature of the ceramics tended to increase with increasing x . The ferroelectric properties were enhanced with increased remanent polarization and P ( E ) loop squareness in the compositions with x = 0.4–4.0 mol%. However, the ferroelectric properties were attenuated with x = 11.0 mol%.