Electron Spin Resonance Investigations and Compensation Mechanism of Europium-Doped Barium Titanate Ceramics

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概要

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• The electron spin resonance (ESR) technique was employed to investigate the point defects and evidence of Eu2+ in Eu-doped barium titanate (EBT) ceramics sintered in air according to the formula (Ba1-xEux)Ti1-x/8O3. The charge equilibrium compensation mechanism was discussed on the basis of ESR with the aid of X-ray diffraction (XRD) and differential scanning calorimetric (DSC) techniques. Eu is incorporated into Ba sites of BaTiO3 as Eu3+ up to $x=0.02$ and as mixed Eu2+/Eu3+ at $x=0.03$, which is evidenced by Eu3+-induced Ti-vacancy defects with $g=2.004$ and a broad Eu2+ signal with $g=1.98$, and a single-phase tetragonal perovskite structure can be retained. When $x\geq 0.04$, it is concluded that high density and low porosity in highly insulating and fine-grained EBT ceramics originate from the coexistence of mixed Eu2+/Eu3+; in particular, the increase in the proportion of Eu2+ in the perovskite phase increases ceramic density, but is accompanied by emergence of the Eu2Ti2O7 phase.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2006-11-15

著者

• Lu Da-yong

  Department Of Physics Jilin University

• Toda Masayuki

  Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan

• Sun Xiu-Yun

  Department of Applied Chemistry, Jilin Institute of Chemical Technology, Chengde Street 45, Jilin, Jilin 132022, China

• Lu Da-Yong

  Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan

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