Synthesis and Dielectric-Magnetic Properties of Rare-Earth (La, Nd, Sm)-Modified Bi4Ti3O12
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概要
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Rare-earth ($\text{RE} = \text{La}$, Nd, Sm)-substitution into BiT (Bi4-XREXTi3O12) was conducted in a composition range of $0 \leq X \leq 3.0$. BiT powders, into which fixed amounts of RE cations were incorporated, were directly synthesized by low-temperature calcination of coprecipitated precursors. Complete substitution with RE was achieved for samples up to $X = 2.5$ at 1100 °C. Dielectric permittivity ($\varepsilon_{\text{r}}$)–temperature curves of the La-2.0, Nd-2.0, and Sm-2.0 ceramics showed $\varepsilon_{\text{r}}$ maxima in a frequency-dependent manner. The $\varepsilon_{\text{r}}$ maxima were located at around 540–560 °C (at 1 kHz), which corresponded to the transition from the ferroelectric to paraelectric phase. Increasing Nd-substitution from $X = 2.0$ to 2.5 resulted in a much suppressed $\varepsilon_{\text{r}}$ maximum at 200–300 °C, which may be due to substantial reduction in the structural distortion giving rise to ferroelectricity of the BiT-based phase. The appearance and enhancement of magnetization was found for the Nd- and Sm-substituted BiT samples. They revealed specified magnetization–magnetic field curves with a small hysteresis loop, suggesting the presence of a weak canted antiferromagnetic interaction.
- 2008-09-25
著者
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Itoh Hidenobu
Department Of Materials Science And Engineering Kitami Institute Of Technology
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Takahashi Junichi
Division Of Materials Chemistry Graduate School Of Engineering Hokkaido University
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Shigyo Tatsuhiro
Division of Materials Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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Kiyono Hajime
Division of Materials Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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Nakano Junya
Division of Materials Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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Kiyono Hajime
Division of Materials Chemistry, Graduate School of Engineering, Hokkaido University, N-13 W-8 Kita-ku, Sapporo 060-8628, Japan
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Kiyono Hajime
Division of Materials Chemistry, Faculty of Engineering, Hokkaido University
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