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Densification behaviors and piezoelectric properties of MnO2, SiO2-doped Pb(Ni1/3Nb2/3)O3–PbTiO3–PbZrO3 ceramics

Published online by Cambridge University Press:  03 March 2011

Jong H. Moon ,
Hyun M. Jang  and
Beoung D. You
Jong H. Moon
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
Hyun M. Jang*
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
Beoung D. You
Affiliation:
Advanced Technology and Research Center, Agency for Defense Development (ADD), Yusung 305-600, Republic of Korea
*
a)Author to whom correspondence should be addressed.
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Abstract

The roles of additives (MnO2, SiO2, and CdO) in controlling microstructural development and piezoelectric properties of Pb(Ni1/3Nb2/3)O3– PbTiO3–PbZrO3(PNN–PT–PZ) ceramics were systematically examined. The addition of SiO2 (<1 wt. %) to the pseudoternary PNN–PT-PZ system enhances densification, but suppresses grain growth significantly. On the other hand, the presence of MnO2 expedites the rate of grain growth without increasing the rate of densification appreciably. The observed difference in the grain-growth behavior was discussed in terms of the viscosity of liquid phase formed during sintering and the diffusion-controlled process for the solute-atoms transport. The rapid increase in the mechanical quality factor (Qm) and the decrease in the relative dielectric permittivity (∊r) and d33 for the MnO2-doped specimens indicate the formation of oxygen vacancies by the dissolution of Mn-atoms into the B-sites of perovskite structure. On the contrary, the presence of CdO (2 mol %) remarkably increases ∊r and d33 of PNN–PT–PZ ceramics.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 12 , December 1993 , pp. 3184 - 3191
Copyright
Copyright © Materials Research Society 1993

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