Abstract Polycrystalline [90 wt% Na0.5Bi0.5TiO3 (NBT) – 10 wt% BaFe12O19 (BaM)] nanocomposite system has been fabricated with the help of solid state reaction method. The Rietveld refinement of X-ray diffraction (XRD) pattern and Transmission electron microscopy (TEM) have been provided the information about the pure phase formation and grain size of desired composite system. Microstructural electric and magnetic transport properties have been carried by complex impedance spectroscopic technique. From electric transport properties it is interestingly observed that, the system has shown double positive temperature coefficient of resistance (PTCR) behaviour due to different transport mechanism of BaM-NBT and NBT-NBT interfaces in different temperature ranges. Magnetoimpedance study has been revealed the negative magnetoresistance [MR (%)] behaviour of both the interfaces. From magnetotransport properties of this nanocomposite system it is explored that BaM-NBT interfaces obey the small polaron tunnelling where NBT-NBT interfaces obey the over lapping large polaron tunneling mechanism for charge transportation.

中文翻译：

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研究用于磁阻抗传感器应用的 Na 0.5 Bi 0.5 TiO 3 – BaFe 12 O 19 纳米复合材料系统的电和磁传输特性

摘要 多晶 [90 wt% Na0.5Bi0.5TiO3 (NBT) – 10 wt% BaFe12O19 (BaM)] 纳米复合系统已在固态反应方法的帮助下制造。X 射线衍射 (XRD) 图案和透射电子显微镜 (TEM) 的 Rietveld 细化提供了有关所需复合系统的纯相形成和晶粒尺寸的信息。微结构的电和磁传输特性已由复阻抗光谱技术承载。从电传输特性有趣地观察到，由于 BaM-NBT 和 NBT-NBT 界面在不同温度范围内的不同传输机制，该系统表现出双正电阻温度系数 (PTCR) 行为。磁阻抗研究已经揭示了两个界面的负磁阻 [MR (%)] 行为。从该纳米复合材料系统的磁传输特性可以看出，BaM-NBT 界面服从小极化子隧穿，其中 NBT-NBT 界面服从重叠的大极化子隧穿机制以进行电荷传输。