Synthesis and structural and electrical characterization of new materials Bi₃R₂FeTi₃O₁₅

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• 作者：O.D. Gil Novoa ; D.A. Landí ; nez Té ; llez ; J. Roa-Rojas ; ^{jroar@unal.edu.co}
• 关键词：Complex perovskite ; Structure ; Electric properties
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 August, 2012
• 卷：407
• 期：16
• 页码：3099-3101
• 文件大小：287 K

摘要

In this work we report the synthesis of polycrystalline samples of Bi₅FeTi₃O₁₅ and Bi₃R₂FeTi₃O₁₅ new compounds with R=Nd, Sm, Gd, Dy, Ho and Yb. The materials were synthesized by the standard solid state reaction recipe from high purity (99.99%) powders. The structural characteristics of materials were analyzed by X-ray diffraction experiments. Rietveld refinement by the GSAS code was performed, taking the input data from the ICSD 74037 database. Results reveal that materials crystallized in orthorhombic single-phase structures and space group Fmm2. Measurements of polarization as a function of applied electric field were carried out using a Radiant Technology polarimeter. We determine the occurrence of hysteretic behaviors, which are characteristic of ferroelectric materials. The main values of remnant and coercive applied fields were observed for substitutions with Yb and Nd, which have the main atomic radii.