Dopant and milling time effect on impedance and electrical properties of perovskite ceramics

محورهای موضوعی : Journal of Theoretical and Applied Physics

Shristi Chaudhary ¹ , Mikanshi Chaudhary ² , Sheela Devi ³ , Shilpi Jindal ⁴

1 - Department of Physics, Chandigarh University, Gharuan, Mohali, Punjab, India.
2 - Department of Physics, Chandigarh University, Gharuan, Mohali, Punjab, India.
3 - Department of Applied Sciences, MSIT, C-4, Janakpuri, New Delhi, India.
4 - Department of Physics, Chandigarh University, Gharuan, Mohali, Punjab, India.

تاریخ دریافت : 1401/09/09 تاریخ پذیرش : 1401/12/04 تاریخ انتشار : 1402/02/11

کلید واژه: ferroelectrics, XRD, SEM, PE, barium titanate,

چکیده مقاله :

Tungsten doped Barium Titanate (BT) with composition BaW0.05Ti0.95O3 (BWT) were prepared by using ball milling technique for different hours (10h, 20h and 30h). In the present paper, the microstructural, dielectric and impedance studies are discussed. The microstructural studies using XRD data reveals the formation of single phased tetragonal structure and perovskite structure. The dielectric properties of BT nanoceramics were significantly enhanced by the partial replacement of W (at B site) showing the diffuse phase transition at 80°C. Dielectric loss rises as the temperature rises. There is increase in charge carrier mobility which results in increased polarization and significant dielectric loss. Additionally, compared to the un-milled BWT ceramic sample, the 30h milled had superior dielectric characteristics with high dielectric constant and reduced loss. The nature of the phase transition was confirmed by the Curie-Weiss law and the ferroelectric analysis was carried by well-established P-E loops. The impedance studies were carried out by plotting Nyquist plots. The ac conductivity plot follows Arrhenius relation and the calculated activation energy confirms the negative temperature coefficient of resistance (NTCR) behavior of the material.