Investigations of dielectric, pyroelectric and electrical properties of Ba5SmTi3Nb7O30 ferroelectric ceramic
Investigations of dielectric, pyroelectric and electrical properties of Ba5SmTi3Nb7O30 ferroelectric ceramic
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DOI：
10.1016/j.jallcom.2009.05.034
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发表时间：
2009-09
影响因子：
6.2
通讯作者：
P. Ganguly;A. Jha;K. L. Deori
中科院分区：
文献类型：
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作者：
P. Ganguly;A. Jha;K. L. Deori
采用高温固相反应法制备了Ba 5SmTi 3 Nb 7 O30多晶样品，并对其介电性能和电学性能进行了研究。X射线衍射（XRD）分析表明，在室温下形成具有正交晶体结构的单相化合物。通过扫描电子显微镜（SEM）的微观结构分析表明，该化合物具有明确的晶粒，这些晶粒均匀地分布在整个样品中。详细的介电性能的化合物作为频率和温度的函数表明，该化合物经历非弛豫型的扩散性质的铁电-顺电相变。本文讨论了该化合物的铁电和热释电性质。研究了该化合物的交流和直流电导率的温度依赖性。在很宽的温度范围内的电导率研究表明，该化合物具有负温度系数的电阻（NTCR）的行为。
The polycrystalline sample of Ba5SmTi3Nb7O30specimen was prepared by high-temperature solid-state reaction method and studied for their dielectric and electrical properties. X-ray diffraction (XRD) analysis reveals the formation of single-phase compound having orthorhombic crystal structure at room temperature. Microstructural analysis by scanning electron microscope (SEM) shows that the compound has well-defined grains, which are distributed uniformly throughout the sample. Detailed dielectric properties of the compound as a function of frequency and temperature show that the compound undergoes non-relaxor kind of ferroelectric–paraelectric phase transition of diffuse nature. Ferroelectric and pyroelectric studies of the compound have been discussed in this paper. The temperature dependence of ac and dc conductivity of the compound has been investigated. The conductivity study over a wide temperature range suggests that the compound has negative temperature coefficient of resistance (NTCR) behaviour.