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首页> 外文期刊>Physica, B. Condensed Matter >Structural, microstructural and electrical studies of La and Cu doped BaTiO3 ceramics
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Structural, microstructural and electrical studies of La and Cu doped BaTiO3 ceramics

机译：La和Cu掺杂的BaTiO3陶瓷的结构，微结构和电学研究

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摘要

The polycrystalline samples of Ba0.92La0.08Ti1-xCuxO3 (x = 0.0, 0.02, 0.04, 0.06) were prepared by a standard high-temperature solid-state reaction method. X-ray diffraction studies at room temperature confirmed the formation of a single-phase polycrystalline compound with tetragonal (x = 0.0, 0.02) and orthorhombic (x = 0.04, 0.06) crystal structure. Scanning electron micrographs also suggest polycrystalline microstructure with the grains of unequal size distributed throughout the pellet sample. Scanning electron micrographs also suggest polycrystalline microstructure with the grains distributed throughout the pellet samples uniformly. Dielectric studies indicate ferroelectric-paraelectric phase transition with a clear shift in the Curie temperature (T-c) of BaTiO3 towards low temperature on doping. Complex impedance spectroscopy analysis indicated, negative temperature coefficient of resistance (NTCR) type behavior irrespective of doping. Conductivity and relaxation properties appear to be thermally activated process and their values suggest that both the conductivity and relaxation species are identical.
机译：通过标准的高温固态反应方法制备Ba0.92La0.08Ti1-xCuxO3（x = 0.0、0.02、0.04、0.06）的多晶样品。室温下的X射线衍射研究证实形成了具有四方晶系（x = 0.0，0.02）和正交晶系（x = 0.04，0.06）的单相多晶化合物。扫描电子显微照片还表明，多晶微结构具有不等大小的晶粒分布在整个颗粒样品中。扫描电子显微照片还表明多晶微观结构，晶粒均匀地分布在整个颗粒样品中。介电研究表明，掺杂时BaTiO3的居里温度（T-c）向低温明显转移，铁电-顺电相变。复阻抗谱分析表明，与掺杂无关，电阻的负温度系数（NTCR）类型行为。电导率和弛豫特性似乎是热激活过程，它们的值表明电导率和弛豫物种都相同。

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