Applied Science and Convergence Technology

The Korean Vacuum Society (한국진공학회)
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Effects of Nb5+ Addition on Microstructure and Dielectric Properties of BaTiO3

  • Kim, Yeon Jung (Center for Innovative Engineering Education, Dankook University) ;
  • Hyun, June Won (Department of Physics, Dankook University)
  • Received : 2017.09.16
  • Accepted : 2017.09.28
  • Published : 2017.09.30
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Abstract

Structural studies on the addition characteristics of Nb ions to $BaTiO_3$ 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 $BaTiO_3$ solid solutions with different mole% of Nb were analyzed. We also investigated the relationship between the dielectric and structural properties of Nb-doped $BaTiO_3$. The transition temperatures of $BaTiO_3$ solid solution doped with 0.5mole%Nb and 1.0 mole%Nb were ${\sim}116^{\circ}C$ and ${\sim}87^{\circ}C$, respectively, which were found to be shifted to very low temperature from the transition temperature of pure $BaTiO_3$ (about $125^{\circ}C$). As a result of analysis of 1/K versus T and ln[$(1/K)-(1/K_m)$ versus ($T-T_m$)] of the two compositions used in this experiment, the diffusivity slightly differs from that of pure $BaTiO_3$ at temperatures above Curie temperature. And this characteristic was analyzed by applying the modified Curie-Weiss law.

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