Ferroelectric Properties of (Na0.5K0.5)NbO3–BaZrO3–(Bi0.5Li0.5)TiO3 Thin Films Deposited on Pt/(001)MgO Substrate by Pulsed Laser Deposition
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概要
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0.92(Na0.5K0.5)NbO3–0.06BaZrO3–0.02(Bi0.5Li0.5)TiO3 (NKN–BZ–BLT) thin films with a thickness of about 2.0 μm were fabricated on a Pt/(001)MgO substrate by pulsed laser deposition (PLD). The X-ray diffraction pattern (XRD) showed that the NKN–BZ–BLT thin films that were oriented in both the 001pt and the 101pt directions [determined by pseudo-tetragonal perovskite (pt)] were grown on the Pt/(001)MgO substrate. A rocking curve measurement revealed that the fluctuations of the crystalline orientation of the 001pt- and 101pt-oriented NKN–BZ–BLT grains are very small. The reciprocal space map and pole figure showed that the 001pt-oriented NKN–BZ–BLT grains epitaxially grew on the Pt/(001)MgO substrate. On the other hand, the 010pt axis (existing in the in-plane) of the 101pt-oriented NKN–BZ–BLT grains rotated by 45° for the 100 axis (existing in the in-plane) of the (001)MgO substrate. The dielectric constant $\varepsilon_{\text{r}}$ and the dielectric loss $\tan\delta$ of the NKN–BZ–BLT thin films were 682 and 0.076 at 1 kHz, respectively. The $P$–$E$ hysteresis loops of the NKN–BZ–BLT thin films showed clear ferroelectricity. The remanent polarization $P_{\text{r}}$ and coercive electric field $E_{\text{c}}$ were 24.5 μC/cm2 and 29.3 kV/cm, respectively. The NKN–BZ–BLT thin films exhibited larger $P_{\text{r}}$ values than NKN–BZ–BLT ceramics.
- 2010-09-25
著者
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Yamazoe Seiji
Department Of Materials Chemistry Ryukoku University
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Adachi Hideaki
Advanced Technology Research Laboratories Matsushita Electric Ind. Co. Ltd.
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Wada Takahiro
Department Of Intelligent Mechanical Systems Faculty Of Engineering Kagawa University
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Miyoshi Yuzo
Department of Materials Chemistry, Ryukoku University, Otsu 520-2194, Japan
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Hattori Takafumi
Department of Materials Chemistry, Ryukoku University, Otsu 520-2194, Japan
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Wada Takahiro
Department of Chemistry, Tokyo Metropolitan University
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