Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Effect of MnO2 Addition on Dielectric, Piezoelectric and Ferroelectric Properties of 0.2Pb(Zn1/3Nb2/3) O3–0.8Pb(Zr1/2Ti1/2)O3 Ceramics

Athipong Ngamjarurojana, and Supon Ananta
* Author for corresponding; e-mail address: suponananta@yahoo.com
Volume: Vol.36 No.1 (JANUARY 2009)
Research Article
DOI:
Received: 20 December 2008, Revised: -, Accepted: 7 January 2009, Published: -

Citation: Ngamjarurojana A. and Ananta S., Effect of MnO2 Addition on Dielectric, Piezoelectric and Ferroelectric Properties of 0.2Pb(Zn1/3Nb2/3) O3–0.8Pb(Zr1/2Ti1/2)O3 Ceramics, Chiang Mai Journal of Science, 2009; 36(1): 59-68.

Abstract

Piezoelectric materials are presently being extensively developed for applications such as ultrasonic motors and piezoelectric transformers. In this study, the dielectric, piezoelectric, and ferroelectric properties of  MnO2-doped 0.2Pb(Zn1/3 Nb2/3)O3 -0.8Pb(Zr1/2Ti1/2)O3 (here after 0.2PZN - 0.8PZT), which is the morphotropic phase boundary composition of  the PZN-PZT system, were investigated. It was found that crystal structure moved to rhombohedral side when increasing MnO2  content.  With the addition of  MnO2 , Curie temperature Tc , the piezoelectric constant d33 , and electromechanical coupling factor kp  were slightly decreased, but the mechanical quality factor Qm  was significantly increased. The P–E  and  s-E loop demonstrated decreased Pr and strain level but increased Ec with addition of  MnO2 These. results clearly showed the significance of  MnO2 addition on the electrical properties of  the PZN–PZT system with ‘‘hard’’ characteristics.

Keywords: dielectric, piezoelectric, ferroelectric, hard doping

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