Crystal structure and enhanced electromechanical properties of Aurivillius ferroelectric ceramics, Bi₄Ti_{3鈭?/sub>x(Mg1/3Nb2/3)xO12}

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• 作者：Changbai Long ; Huiqing Fan ; Mengmeng Li ; Guangzhi Dong ; Qiang Li
• 关键词：Bi4Ti3&minus ; x(Mg1/3Nb2/3)xO12 ; Aurivillius ferroelectric ceramics ; Piezoelectricity ; Rietveld refinement ; Leakage current
• 刊名：Scripta Materialia
• 出版年：15 March, 2014
• 年：2014
• 卷：75
• 期：Complete
• 页码：70-73
• 全文大小：1039 K

文摘

The effect of Mg²⁺/Nb⁵⁺ co-substitution at the B-site on the structures and electrical properties of modified Aurivillius ceramics, Bi₄Ti_{3鈭?/sub>x(Mg1/3Nb2/3)xO12, was investigated. Rietveld refinement suggested that Bi4Ti3鈭?/sub>x(Mg1/3Nb2/3)xO12 crystallized in the orthorhombic space group B2cb at room temperature. A high remnant polarization of 15.5 渭C cm^鈭?, a large field-induced strain of 0.068% and a high piezoelectric activity of 30 pC N^鈭? were observed in Bi4Ti2.95(Mg1/3Nb2/3)0.05O12, with a Curie point of 685 掳C, due to an enhancement in structural distortion and a reduction in leakage current.}