Dielectric properties of Pb (Zn1/3 Nb2/3) O3?PbZrO3?PbTiO3 solid solution near morphotropic phase boundary |
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| Authors: | Xiangping Jiang Jianwen Fang Huarong Zeng Guorong Li Daren Chen and Qingrui Yin |
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| Affiliation: | (1) Laboratory of Functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050 Shanghai, China;(2) Material Engineering Department, Jingdezhen Ceramic Institute, 333001 Jingdezen, China |
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| Abstract: | The dielectric properties of Pb(Zn1/3Nb2/3) O3-PbZrO3−PbTiO3 (PZN-PZ-PT) system near the rhombohedral/tetragonal morphotropic phase boundary (MPB) are carefully studied in this paper.
It is found that, for all samples, the curves around the temperatures of dielectric permittivity peak show the characteristics
of diffuse phase transition. The change in PbZrO3/PbTiO3 ratio has much influence on the dielectric properties of the samples. The extent of diffuse phase transition increases with
the increasing Zr/Ti ratio. The samples in rhombohedral region have typical diffuse phase transition in the temperature range
measured. However, for the samples with tetragonal symmetry, a spontaneous normal ferroelectric-relaxor phase transition exists
at temperature lower than that of permittivity peak. This normal ferroelectric-relaxor phase transition is confirmed by the
experiment of thermally driven current. The analysis of TEM reveals that the samples in tetragonal region show a 90% macrodomain
structure, while the samples in rhombohedral region have the configuration of microdomain structure. |
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| Keywords: | PZN-PZ-PT solid solution morphotropic phase boundary dielectric property phase transition |
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