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Ferroelectrics Volume 261, 2001 - Issue 1
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Session C: Relaxor ferroelectrics

Effect of stoichiometry on dielectric and field-induced piezoelectric properties of 0.75Pb(Ni1/3Nb2/3)O3-0.25PbTiO3 ceramics

Yong Zhang Beijing Fine Ceramics Laboratory, Institute of Nuclear Energy Technology and State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China
,
Jiemo Tian Beijing Fine Ceramics Laboratory, Institute of Nuclear Energy Technology and State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China
,
Longtu Li Beijing Fine Ceramics Laboratory, Institute of Nuclear Energy Technology and State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China
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Zhilun Gui State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China
Pages 119-124 | Received 03 Aug 2001, Published online: 25 Oct 2011
 
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Abstract

The influences of stoichiometry on the dielectric and field-induced piezoelectric properties of 0.75Pb(Ni1/3Nb2/3)O3-0.25PbTiO3 are examined. The addition of excess Ni(Ac)2 was found to restrain the generation of pyrochlore phase and resulted in pure perovskite phase, while the addition of lead titanate can not enhance the yield of the perovskite phase. With increasing excess nickel content, the maximum dielectric constant decreases gradually and the maximum Curie temperature does not shift. This decrease was attributed to the increase in minor phases with lower dielectric constant. The piezoelectric effect induced by a direct current bias field was also investigated. The evaluation showed that the induced electromechanical thickness coupling coefficients measured at room temperature decreased as the content of excess nickel oxide increased.

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