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LaNiO<sub>3</sub> 전극위에 (100)으로 배향된 (Na<sub>0.5</sub>Bi<sub>0.5</sub>)TiO<sub>3</sub> 박막의 성장
유영배,박민석,손세모,정수태,Yoo Young-Bae,Park Min-Seok,Son Se-mo,Chung Su-Tae 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.2
[ $(Na_{0.5}Bi_{0.5})TiO_3$ ][NBT] thin films were prepared on a highly (100) oriented $LaNiO_3[LNO]$ by sol-gel process. X-ray diffraction patterns of the NBT films annealed above $600^{\circ}C$ for 5 minutes have confirmed a highly (100) oriented growth and pseudocubic structure (a=3.884${\AA}$). The (l00) orientation factor increased from 90 to $99\%$ with increasing soaking time from 5 to 60 minutes at $600^{\circ}C$. The NBT films ($600^{\circ}C$/5 min,) have a flat and dense microstructure with large columnar grains, and their grain size are about 44 nm. The Au/NBT/LNO/Si hetero structure sample show a ferroelectric properties.
(Na<sub>1</sub>K<sub>1</sub>Cd)NbO<sub>3</sub> 무연 세라믹스의 압전특성
노영우,유영배,손세모,정수태,No Young-Woo,Yoo Young-Bae,Son Se-Mo,Chung Su-Tae 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.8
Lead free $(Na_{0.5}K_{0.47}Cd_x)NbO_3$ ceramics (x=0.015-0.005) were prepared by the conventional mixed oxide route. The effects of CdO addition on the sintering, dielectric and piezoelectric properties of the samples were examined. The addition of CdO greatly enhanced the sinterability of ceramics and the sample has a lower dielectric loss. The $k_p\;and\;Q_m$ of the samples with 0.02 mol CdO addition are 0.35 and 125, respectively, The $(Na,K)NbO_3$ ceramics show a large degradation of $k_p$ due to the deliquescence when exposed to humidity, while the $(Na,K,Cd)NbO_3$ ceramics have no a significant degradation of it.