The morphotropic phase boundary and dielectric properties of the xPb(Zr{sub 1/2}Ti{sub 1/2})O{sub 3}-(1-x)Pb(Ni{sub 1/3}Nb{sub 2/3})O{sub 3} perovskite solid solution
- Department of Physics Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand)
The solid solution between the normal ferroelectric Pb(Zr{sub 1/2}Ti{sub 1/2})O{sub 3} (PZT) and relaxor ferroelectric Pb(Ni{sub 1/3}Nb{sub 2/3})O{sub 3} (PNN) was synthesized by the columbite method. The phase structure and dielectric properties of xPZT-(1-x)PNN where x=0.4-0.9 and the Zr/Ti composition was fixed close to the morphotropic phase boundary (MPB) were investigated. With these data, the ferroelectric phase diagram between PZT and PNN has been established. The relaxor ferroelectric nature of PNN gradually transformed towards a normal ferroelectric state towards the composition 0.7PZT-0.3PNN, in which the permittivity was characterized by a sharp peak and the disappearance of dispersive behavior. X-ray diffraction analysis demonstrated the coexistence of both the rhombohedral and tetragonal phases at the composition 0.8PZT-0.2PNN, a new morphotropic phase boundary within this system. Examination of the dielectric spectra indicates that PZT-PNN exhibits an extremely high relative permittivity near the MPB composition. The permittivity shows a shoulder at the rhombohedral to tetragonal phase transition temperature T{sub RT}=195 deg. C, and then a maximum permittivity (36 000 at 10 kHz) at the transition temperature T{sub max}=277 deg. C at the MPB composition. The maximum transition temperature of this system was 326 deg. C at the composition x=0.9 with the relative permittivity of 32 000 at 10 kHz.
- OSTI ID:
- 20662148
- Journal Information:
- Journal of Applied Physics, Vol. 96, Issue 9; Other Information: DOI: 10.1063/1.1796511; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CRYSTAL STRUCTURE
FERROELECTRIC MATERIALS
KHZ RANGE 01-100
NICKEL COMPOUNDS
NIOBIUM COMPOUNDS
PEAKS
PERMITTIVITY
PEROVSKITE
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PZT
RAMAN SPECTRA
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TRANSITION TEMPERATURE
X-RAY DIFFRACTION