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Research Paper

Applied Science and Convergence Technology 2017; 26(5): 143-147

Published online September 30, 2017

https://doi.org/10.5757/ASCT.2017.26.5.143

Copyright © The Korean Vacuum Society.

Effects of Nb5+ Addition on Microstructure and Dielectric Properties of BaTiO3

Yeon Jung Kima , * , and June Won Hyunb

aCenter for Innovative Engineering Education, Dankook University, Yongin 16890, Korea, bDepartment of Physics, Dankook University, Cheonan 31116, Korea

Correspondence to:E-mail: yjkim80@dankook.ac.kr

Received: September 16, 2017; Revised: September 26, 2017; Accepted: September 28, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Structural studies on the addition characteristics of Nb ions to BaTiO3 solid solutions were performed by XRD and SEM/EDS technique. The X-ray diffraction peaks of the (111), (200) and (002) planes of Nb-doped BaTiO3 solid solutions with different mole% of Nb were analyzed. We also investigated the relationship between the dielectric and structural properties of Nb-doped BaTiO3. The transition temperatures of BaTiO3 solid solution doped with 0.5mole%Nb and 1.0 mole%Nb were ~116°C and ~87°C, respectively, which were found to be shifted to very low temperature from the transition temperature of pure BaTiO3 (about 125°C). As a result of analysis of 1/K versus T and ln[(1/K)-(1/Km) versus (T-Tm)] of the two compositions used in this experiment, the diffusivity slightly differs from that of pure BaTiO3 at temperatures above Curie temperature. And this characteristic was analyzed by applying the modified Curie-Weiss law.

Keywords: Nb-doped BaTiO3, SEM/EDS, Dielectric properties, Modified Curie-Weiss law

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