Induction of Relaxor Behavior in Na1−xSrx/2x/2NbO3 through the Introduction of Cationic Vacancies

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• 作者：Almudena Torres-Pardo ; Ricardo Jimnez ; Jose M. Gonzlez-Calbet ; Ester Garca-Gonzlez
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：June 9, 2009
• 年：2009
• 卷：21
• 期：11
• 页码：2193-2200
• 全文大小：331K
• 年卷期：v.21,no.11(June 9, 2009)
• ISSN：1520-5002

文摘

Materials in the Na_1−xSr_x/2x/2NbO₃ system (0.3 ≤ x ≤0.4) have been investigated by combining diffraction methods and high resolution electron microscopy with dielectric measurements. They undergo a microstructural evolution by continuously decreasing the coherent structural domain size as a consequence of the random distribution of the growing A-vacancy concentration. Change in the electrical properties occurs from the achievement of relaxor ferroelectric character in Na_0.7Sr_0.15NbO₃ to the strongly diffuse phase transition of Na_0.6Sr_0.2NbO₃. The nanometric size of the structural domains found in the relaxor material led us to discuss the relationship between structural domain and polar region.