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北田 和也*; 小舟 正文*; 足立 渉*; 矢澤 哲夫*; 齋藤 寛之; 青木 勝敏; 水木 純一郎; 石川 健哉*; 平永 良臣*; 長 康雄*
Chemistry Letters, 37(5), p.560 - 561, 2008/05
被引用回数:9 パーセンタイル:37.65(Chemistry, Multidisciplinary)Bi(NiTi)O ceramics with a perovskite structure was synthesized at a high pressure of 6 GPa. It was confirmed that the synthesized samples had a multidomain structure and ferroelectricity on the basis of scanning nonlinear dielectric microscopy (SNDM) and polarization-electric field (P-E) hysteresis loop measurements.
小舟 正文*; 福島 浩次*; 山路 徹*; 多田 英人*; 矢澤 哲夫*; 藤澤 浩訓*; 清水 勝*; 西畑 保雄; 松村 大樹; 水木 純一郎; et al.
Journal of Applied Physics, 101(7), p.074110_1 - 074110_6, 2007/04
被引用回数:8 パーセンタイル:33.33(Physics, Applied)高周波マグネトロンスパッタリングにより、Pt(100)/MgO(100)基板上に作製したビスマスランタンニッケル酸化物薄膜(BiLa)(NiTi)O(BLNT)のエピタキシャル成長、構造特性、誘電特性について、X線回折、透過型電子顕微鏡、ヒステリシスループ測定によって調べられた。強誘電的BLNTはx0.3でc軸配向し、単結晶の正方晶構造が現れる。c/aはLaの濃度が増えるにつれて1.004から1.028に変化する。成長方向の周りに4回対称性が見られた。X線異常散乱とX線吸収スペクトルの結果より、Biはペロブスカイト構造のAを+3価で占有していることが確かめられた。12C/cmの大きな残留分極の値が得られた。
齋藤 寛之; 北田 和也*; 小舟 正文*; 足立 渉*; 矢澤 哲夫*; 石川 健哉*; 平永 良臣*; 長 康雄*; 青木 勝敏
no journal, ,
Ferroelectric lead zirconate titanate is widely used as integral parts of electrical devices due to the high dielectric and electromechanical properties. However, the toxicity of lead oxide results in serious environmental problems and hence alternative compounds free from lead are urgently under development. Since Bi ion has the same electronic structure as the Pb ions, Bi-containing perovskites are promising candidates for lead-free ferroelectric ceramics. Bi(NiTi), BNT, ceramic was synthesized using reagent-grade BiO, TiO and NiCOnHO as starting materials. A mixture of the starting materials was calcined in air and then grounded to fine powder to fill up densely a high-pressure reaction cell. The sample was initially compressed and successively heated on keeping constant pressure. The single-phase perovskite structure was formed. P-E hysteresis loop shows that the BNT ceramic is ferroelectric. A multi domain structure of the BNT ceramic was also measured by scanning nonlinear dielectric microscopy.