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Structural, Electrical and Ferroelectric Characteristics of Bi(Fe0.9La 0.1)O3
Ceramics International ( IF 5.2 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.ceramint.2018.08.185
Nripesh Kumar , Alok Shukla , Nitin Kumar , Sushrisangita Sahoo , Sugato Hajra , R.N.P. Choudhary

Abstract Nowadays, much attention is paid for the development of lead-free complex or mixed metal oxides, which can be utilized for multi-functional devices. This communication provides the information on synthesis (by mixed oxide route) and physical properties (structural, electrical and ferroelectric) of the polycrystalline sample of Bi(Fe 0.9 La 0.1 )O 3 Analysis of the phase formation and basic crystal data of the material using X-ray diffraction (XRD) technique shows an orthorhombic symmetry with well-defined cell parameters. It has been shown that a small amount (10%) of La substitution at the Fe site of BiFeO 3 suppresses the impurity phase usually observed during phase formation of BiFeO 3 . The average crystallite size, calculated through applying Scherrer's technique, was found to be 68 nm. For the study of surface morphology (grain size and distribution) of the compound, the scanning electron microscope (SEM) was used. The grains of different dimension were found homogeneously distributed at the entire surface of the sample. The La substitution strongly affects the capacitive (dielectric) and resistive (electrical) characteristics of bismuth ferrite in a wide range of frequency and temperature. The contributions of grains and grain boundaries in the capacitive as well as in the resistive properties of the material at different temperatures and frequencies were studied by means of the impedance spectroscopy technique. This study has provided numerous useful and interesting data which may find potential industrial applications.

中文翻译:

Bi(Fe0.9La 0.1)O3 的结构、电学和铁电特性

摘要 目前,可用于多功能器件的无铅络合物或混合金属氧化物的开发备受关注。本通讯提供了 Bi(Fe 0.9 La 0.1 )O 3 多晶样品的合成(通过混合氧化物途径)和物理特性(结构、电学和铁电)的信息,使用该材料分析相形成和基本晶体数据X 射线衍射 (XRD) 技术显示具有明确定义的细胞参数的正交对称性。已经表明,在 BiFeO 3 的 Fe 位点处的少量 La 取代(10%)抑制了通常在 BiFeO 3 相形成过程中观察到的杂质相。发现通过应用 Scherrer 技术计算的平均微晶尺寸为 68 nm。为了研究化合物的表面形态(晶粒尺寸和分布),使用了扫描电子显微镜 (SEM)。发现不同尺寸的晶粒均匀分布在样品的整个表面。La 取代强烈影响铋铁氧体在很宽的频率和温度范围内的电容(介电)和电阻(电)特性。借助阻抗谱技术研究了晶粒和晶界对材料在不同温度和频率下的电容和电阻特性的贡献。这项研究提供了许多有用和有趣的数据,可能会发现潜在的工业应用。发现不同尺寸的晶粒均匀分布在样品的整个表面。La 取代强烈影响铋铁氧体在很宽的频率和温度范围内的电容(介电)和电阻(电)特性。借助阻抗谱技术研究了晶粒和晶界对材料在不同温度和频率下的电容和电阻特性的贡献。这项研究提供了许多有用和有趣的数据,可能会发现潜在的工业应用。发现不同尺寸的晶粒均匀分布在样品的整个表面。La 取代强烈影响铋铁氧体在很宽的频率和温度范围内的电容(介电)和电阻(电)特性。借助阻抗谱技术研究了晶粒和晶界对材料在不同温度和频率下的电容和电阻特性的贡献。这项研究提供了许多有用和有趣的数据,可能会发现潜在的工业应用。La 取代强烈影响铋铁氧体在很宽的频率和温度范围内的电容(介电)和电阻(电)特性。借助阻抗谱技术研究了晶粒和晶界对材料在不同温度和频率下的电容和电阻特性的贡献。这项研究提供了许多有用和有趣的数据,可能会发现潜在的工业应用。La 取代强烈影响铋铁氧体在很宽的频率和温度范围内的电容(介电)和电阻(电)特性。借助阻抗谱技术研究了晶粒和晶界对材料在不同温度和频率下的电容和电阻特性的贡献。这项研究提供了许多有用和有趣的数据,可能会发现潜在的工业应用。
更新日期:2018-12-01
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