Relaxation and Conduction Mechanisms of High Tc Lead-Free Ba (Zr,Ti)O3 Positive Temperature Coefficient of Resistivity Ceramic Using Impedance Spectroscopy
International Journal of Mechanical Engineering and Applications
Volume 2, Issue 1, February 2014, Pages: 11-17
Received: Dec. 25, 2013; Published: Jan. 30, 2014
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Authors
Md. Azizar Rahman, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
Abdul Quader, Faculty of Engineering & Technology, Eastern University, Dhaka, Bangladesh
A. K. M. Akther Hossain, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
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Abstract
High Tc lead–free Ba (Zr0.52Ti0.48)O3 positive temperature coefficient of resistivity (PTCR) ceramic was produced by the standard solid state reaction technique. X–ray diffraction pattern confirms the formation of the tetragonal perovskite structure of the ferroelectric sample. The conduction and relaxation mechanisms of the piezoelectric ceramic have been studied on the basis of activation energy. The relaxation mechanism is investigated for this sample based on the peaks of the imaginary part of electrical impedance and modulus spectra. The Cole-Cole plots indicate that the grain effect is influenced by the increase of temperature up to 200 °C and disappeared beyond this temperature. The temperature versus electrical resistivity plots show that a phase transition occurs at the Curie temperature, Tc =150 °C. The ceramic exhibits a PTCR jump of almost two orders of magnitude starting at 150 °C and ending at 275 °C with a high temperature coefficient of resistivity of ~25 % per °C. The electrical resistivity measurements also reveal that the sample shows semiconducting behavior beyond 275 °C with the value of negative temperature coefficient of resistivity of ~ 0.6% per °C.
Keywords
Relaxation Mechanism, Conduction Mechanism, Impedance Spectroscopy, Modulus Spectroscopy
To cite this article
Md. Azizar Rahman, Abdul Quader, A. K. M. Akther Hossain, Relaxation and Conduction Mechanisms of High Tc Lead-Free Ba (Zr,Ti)O3 Positive Temperature Coefficient of Resistivity Ceramic Using Impedance Spectroscopy, International Journal of Mechanical Engineering and Applications. Vol. 2, No. 1, 2014, pp. 11-17. doi: 10.11648/j.ijmea.20140201.13
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