温度和频率对ABO3型正交钙钛矿结构和介电行为研究的影响

DAE SOLID STATE PHYSICS SYMPOSIUM 2018 Pub Date : 2019-07-12 DOI:10.1063/1.5113434

Abhinav Yadav, S. P. Mantry, P. M. Sarun

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引用次数: 0

摘要

采用常规固相反应法制备无铅铌酸钠(NaNbO3)陶瓷，烧结温度为1150℃，烧结时间为4h。利用x射线衍射和场发射扫描电镜(FE-SEM)分析了样品的结构和表面形貌。对NaNbO3 (NN)样品的XRD研究证实其形成了具有正交晶型结构的单相。神经网络样品的表面显微照片表明，形成的晶粒具有清晰的晶界和正交形状。详细研究了神经网络陶瓷在宽频率范围(100 Hz - 1 MHz)和不同温度(250℃- 330℃)下的介电性能。实际介电常数(e′)和介电损耗(tan δ)的大小与温度和频率密切相关。频率相关电导率的分析表明，电导率是由晶界和晶粒共同完成的。阻抗研究揭示了神经网络陶瓷的负电阻温度系数(NTCR)行为和时间弛豫。采用常规固相反应法制备无铅铌酸钠(NaNbO3)陶瓷，烧结温度为1150℃，烧结时间为4h。利用x射线衍射和场发射扫描电镜(FE-SEM)分析了样品的结构和表面形貌。对NaNbO3 (NN)样品的XRD研究证实其形成了具有正交晶型结构的单相。神经网络样品的表面显微照片表明，形成的晶粒具有清晰的晶界和正交形状。详细研究了神经网络陶瓷在宽频率范围(100 Hz - 1 MHz)和不同温度(250℃- 330℃)下的介电性能。实际介电常数(e′)和介电损耗(tan δ)的大小与温度和频率密切相关。频率相关电导率的分析表明，电导率是由晶界和晶粒共同完成的。阻抗研究表明，负温度系数…

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Effect of temperature and frequency on the studies of structural and dielectric behavior of ABO3 type orthorhombic perovskite

Lead-free sodium niobate (NaNbO3) ceramics is prepared via conventional solid state reaction technique at sintering temperature 1150 °C for 4 h. The structural and surface morphology of the sample has been done by using X-ray diffraction and Field emission scanning electron microscopy (FE-SEM), respectively. The XRD study of NaNbO3 (NN) sample confirmed the formation of single phase with orthorhombic crystal structure. The surface micrographs of NN sample indicates the formation of grains with clear grain boundaries and orthorhombic shape. The detailed investigation of dielectric properties of NN ceramics are done in wide frequency range (100 Hz – 1 MHz) at various temperatures (250 °C – 330 °C). The magnitude of real dielectric constant (e′) and dielectric loss (tan δ) are strongly dependent on temperature and frequency. The analysis of frequency dependent conductivity reveals that the conduction done by grain boundaries and grains, both. The impedance study reveals that the negative temperature coefficient of resistance (NTCR) behavior and time relaxation in NN ceramic.Lead-free sodium niobate (NaNbO3) ceramics is prepared via conventional solid state reaction technique at sintering temperature 1150 °C for 4 h. The structural and surface morphology of the sample has been done by using X-ray diffraction and Field emission scanning electron microscopy (FE-SEM), respectively. The XRD study of NaNbO3 (NN) sample confirmed the formation of single phase with orthorhombic crystal structure. The surface micrographs of NN sample indicates the formation of grains with clear grain boundaries and orthorhombic shape. The detailed investigation of dielectric properties of NN ceramics are done in wide frequency range (100 Hz – 1 MHz) at various temperatures (250 °C – 330 °C). The magnitude of real dielectric constant (e′) and dielectric loss (tan δ) are strongly dependent on temperature and frequency. The analysis of frequency dependent conductivity reveals that the conduction done by grain boundaries and grains, both. The impedance study reveals that the negative temperature coeffici...

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DAE SOLID STATE PHYSICS SYMPOSIUM 2018

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