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Preparation and electrical properties of high-Curie temperature ferroelectrics

Published online by Cambridge University Press:  31 January 2009

B.-J. Fang ,
C.-L. Ding ,
W. Liu ,
L.-Q. Li  and
L. Tang
B.-J. Fang*
Affiliation:
School of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164, P.R. China Key Laboratory for Polymer Materials, Changzhou, Jiangsu 213164, P.R. China
C.-L. Ding
Affiliation:
School of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164, P.R. China
W. Liu
Affiliation:
School of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164, P.R. China
L.-Q. Li
Affiliation:
Staff Room of Chemistry, Bengbu Medical College, Bengbu, Anhui 233000, P.R. China
L. Tang
Affiliation:
Staff Room of Chemistry, Bengbu Medical College, Bengbu, Anhui 233000, P.R. China
*
fangbj@em.jpu.edu.cn
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Abstract

( $1-x$ )Pb(Fe0.5Nb0.5)O3-xPb(Zr0.2Ti0.8)O3 (PFN-PZT, x = 0.75, 0.80, 0.85) ferroelectric ceramics were prepared by conventional solid-state reaction method via the wolframite precursor route. XRD measurements confirmed that the synthesized PFN-PZT ceramics are of pure tetragonal perovskite structure. With the increase of Pb(Zr0.2Ti0.8)O3 (PZT) content, tetragonality (defined as the ratio of cell parameter c/a) increases slightly accompanied by the variation of cell volume. At the optimized sintering condition of 1175 °C for 2 h, the 0.20PFN-0.80PZT ceramics exhibit the largest value of relative density (93.77%). The PFN-PZT ceramics exhibit first-order ferroelectric phase transition of typical normal ferroelectrics, where the dielectric response peaks are narrow, sharp and without frequency dispersion, and the dielectric constant above Curie temperature (T C ) can be fitted well by Curie law. The sintered PFN-PZT ceramics exhibit high-T C , and with the increase of PZT content, T C increases and reaches 368, 394 and 401 °C, respectively. With the increase of PZT content, the P-E ferroelectric hysteresis loops of the PFN-PZT ceramics become narrower accompanied by the decrease of remanent polarization (P r ) and coercive field (E C ). Piezoelectric constant d 33 of all the PFN-PZT ceramics is small, less than 10 pC/N.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 45 , Issue 2 , February 2009 , 20302
Copyright
© EDP Sciences, 2009

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