Impedance spectroscopy and structural properties of the perovskite-like Sn(Ba,Sr)O₃ stagnate

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• 作者：J. Cuervo Farfá ; n^a ; ^b ; J.J. Olaya^c ; E. Vera Ló ; pez^d ; D.A. Landí ; nez Té ; llez^a ; J. Roa-Rojas^a ; ^{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：3089-3092
• 文件大小：685 K

摘要

An exhaustive study of structural, electrical and transport properties on the perovskite stagnate Sn(Ba,Sr)O₃ was performed. Samples of SnBa_1鈭?em>xSr_xO₃ with 0鈮?em>x鈮?.00 were prepared by the solid state reaction method. The crystallographic structure was studied by X-ray diffraction experiments and Rietveld refinement using the GSAS code. Results reveal the material synthesized in a cubic structure (space group Pm3虅m, #221) for 0鈮?em>x鈮?.50 and in an orthorhombic (space group Pnma, #62) for x>0.50. The approximate grain size was found from experiments' Scanning Electron Microscopy. The electric response was studied by the Impedance Spectroscopy technique from 10.0 mHz up to 0,10 MHz. Electric polarization measurements for SnSrO₃ and SnBaO₃ were determined through curves of polarization as a function of applied electric field, which reveal the ferroelectric character of the material. From the saturation polarization the dielectric constants of materials were calculated.