Premium
Normal‐Relaxor‐Diffuse Ferroelectric Phase Transition and Electrical Properties of Bi ( Mg 1/2 Ti 1/2 ) 3 – PbZrO 3 – PbTiO 3 Solid Solution Ceramics Near the Morphotropic Phase Boundary
Author(s) -
Yi Haifeng,
Zuo Ruzhong
Publication year - 2014
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.12874
Subject(s) - materials science , ferroelectricity , phase boundary , tetragonal crystal system , analytical chemistry (journal) , dielectric , ternary operation , phase (matter) , perovskite (structure) , crystallography , mineralogy , crystal structure , chemistry , optoelectronics , organic chemistry , chromatography , computer science , programming language
Perovskite‐type x Bi ( Mg 1/2 Ti 1/2 ) O 3 –(0.56 − x ) PbZrO 3 –0.44 PbTiO 3 ( x BMT – PZ – PT ) ternary solid solution ceramics were synthesized via a conventional solid‐state reaction method. The phase transition behaviors, dielectric, ferroelectric, and piezoelectric properties were investigated as a function of the BMT content. The X‐ray diffraction analysis showed that the tetragonality of x BMT – PZ – PT was enhanced with increasing the BMT content, and a morphotropic phase boundary ( MPB ) between rhombohedral and tetragonal phases was identified approximately in the composition of x = 0.08. In addition, the dielectric diffuseness and frequency dispersion behavior were induced with the addition of BMT and a normal‐relaxor‐diffuse ferroelectric transformation was observed from the PZ ‐rich side to the BMT ‐rich side. The electrical properties of x BMT – PZ – PT ceramics exhibit obviously compositional dependence. The x = 0.08 composition not only possessed the optimum properties with ε T 33 / ε 0 = 1450, Q m = 69, d 33 = 390 pC/N, k p = 0.46, P r = 30 μC/cm 2 , E c = 1.4 kV/mm, T c = 325°C, and a strain of 0.174% ( d 33 * = 436 pm/V) under an electric field of 4 kV/mm as a result of the coexistence of two ferroelectric phases near the MPB , but also owned a good thermal‐depolarization behavior with a d 33 value of >315 pC/N up to 290°C and a frequency‐insensitive strain behavior.