首页|Dielectric Characteristics of the Lead-free Piezoelectric Ceramics K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3

Dielectric Characteristics of the Lead-free Piezoelectric Ceramics K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3

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  • Trans Tech Publications Ltd
In order to improve the sintering density and dielectric properties of the lead-free K_(0.5)Na_(0.5)NbO_3-based ceramics, bythe use of solid-state reaction, part of the Nb atoms are substituted by the Ta atoms to form K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3 ceramics and the dielectric characteristics are detail investigated in this letter. It is found that the phases of K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3 ceramics are pure perovskite with typical orthorhombic symmetry, in addition, no other secondary phases could be certified. For pure K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3 ceramics, the shapes of the grains are quadrate and which would due to the increase of the porosity and can not be eliminated easily. Because of the phase stability of pure K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3 ceramics is limited to 1140℃ in this study, higher sintering temperature (over than 1140℃) is not suitable for the fabrication of K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3 ceramics. Moreover, the Ta atoms in the K_(0.5)Na_(0.5)NbO_3-based ceramics could be used to improve the dielectric properties effectively, and it also reveals lower Curie temperature and lower phase transition temperature than the pure K_(0.5)Na_(0.5)NbO_3 ceramics. In this letter, for 1120℃-sintered K_(0.50)Na_(0.50)Nb_(0.95)Ta_(0.05)O_3 ceramics, the optimum bulk density is 95.6 % of the theorical density, the Curie temperature is 380℃, and the optimum relative dielectric constant is 6107 at 10 kHz.

lead-freedielectric characteristicscurie temperature

Chien-Min Cheng、Kai-Huang Chen、Hung-Chi Yang、Cheng-Fu Yang、Wen-Cheng Tzou、Ming-Chang Kuan、Fuh-Cheng Jong

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Department of Electronic Engineering, Southern Taiwan University, Tainan, Taiwan

Department of Electronics Engineering and Computer Science, Tung-Fang Institute of Technology, Kaohsiung, Taiwan

Department of Electrical Engineering, Southern Taiwan University, Tainan, Taiwan

Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan

Department of Electro-Optical Engineering, Southern Taiwan University, Tainan, Taiwan

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2010

10.4028/www.scientific.net/KEM.434-435.285

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.434/435
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