Characterization of the BaBiO3-doped BaTiO3 positive temperature coefficient of a resistivity ceramic using impedance spectroscopy with Tc=155℃

doi:10.1088/1674-1056/20/4/048701

Abstract BaBiO₃-doped BaTiO₃ (BB–BT) ceramic, as a candidate for lead-free positive temperature coefficient of resistivity (PTCR) materials with a higher Curie temperature, has been synthesized in air by a conventional sintering technique. The temperature dependence of resistivity shows that the phase transition of the PTC thermistor ceramic occurs at the Curie temperature, T_c=155 ℃, which is higher than that of BaTiO₃ ( ≤ 130 ℃). Analysis of ac impedance data using complex impedance spectroscopy gives the alternate current (AC) resistance of the PTCR ceramic. By additional use of the complex electric modulus formalism to analyse the same data, the inhomogeneous nature of the ceramic may be unveiled. The impedance spectra reveal that the grain resistance of the BB–BT sample is slightly influenced by the increase of temperature, indicating that the increase in overall resistivity is entirely due to a grain-boundary effect. Based on the dependence of the extent to which the peaks of the imaginary part of electric modulus and impedance are matched on frequency, the conduction mechanism is also discussed for a BB–BT ceramic system.

Keywords: BaBiO₃-doped BaTiO₃ positive temperature coefficient thermistor impedance spectroscopy high T_c

Received: 16 June 2010
Revised: 08 December 2010
Accepted manuscript online:

PACS:	87.19.rf	(Dielectric properties)
	84.32.Ff	(Conductors, resistors (including thermistors, varistors, and photoresistors))
	81.05.Je	(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
	82.56.Na	(Relaxation)

Fund: Project supported by the Research Funds of the Guangxi Key Laboratory of Information Materials at the School of Material Science and Engineering, China (Grant No. 0710908-07-Z).

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Yuan Chang-Lai(袁昌来), Liu Xin-Yu(刘心宇), Zhou Chang-Rong(周昌荣), Xu Ji-Wen(许积文), and Yang Yun(杨云) Characterization of the BaBiO₃-doped BaTiO₃ positive temperature coefficient of a resistivity ceramic using impedance spectroscopy with T_c=155℃ 2011 Chin. Phys. B 20 048701

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Characterization of the BaBiO3-doped BaTiO3 positive temperature coefficient of a resistivity ceramic using impedance spectroscopy with Tc=155℃

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Characterization of the BaBiO₃-doped BaTiO₃ positive temperature coefficient of a resistivity ceramic using impedance spectroscopy with T_c=155℃