Title :
Complex impedance analyses of PTCR ceramics based on barium-lithium-bismuth titanate
Author :
Plutenko, T.A. ; V´yunov, O.I. ; Belous, A.G.
Author_Institution :
Vernadskii Inst. of Gen. & Inorg. Chem., Kiev, Ukraine
Abstract :
The formation of (1-x)BaTiO3-xLi0.5Bi0.5TiO3 (0 ≤ x ≤ 0.6) solid solutions with positive temperature coefficient of resistance (PTCR) effect was studied. Powders were prepared by solid-phase reaction technique. Ceramics were sintered under reducing atmosphere N2/H2 in the temperature range 1200-1450°C with subsequent oxidation in air. It was shown that minimum value of resistivity rises with increase in x value. Complex impedance analysis shown that ceramic grains of (1-x)BaTiO3-xLi0.5Bi0.5TiO3 materials consist of three areas with different electrical properties. Boundaries and outer layers of grains make the main contribution to the PTCR effect in lithium-containing solid solutions. The potential barrier decreases with increasing x.
Keywords :
barium compounds; ceramics; electrical resistivity; grain size; oxidation; powders; sintering; solid solutions; BaTiO3-Li0.5Bi0.5TiO3; PTCR ceramics; PTCR effect; ceramic grains; complex impedance analyses; electrical properties; oxidation; positive temperature coefficient of resistance; potential barrier; powders; resistivity; sintering; solid solutions; solid-phase reaction technique; temperature 1200 degC to 1450 degC; Immune system; Lead; NIST; Oxidation; Temperature; PTCR; barium titanate; complex impedance analysis; perovskite;
Conference_Titel :
Oxide Materials for Electronic Engineering (OMEE), 2014 IEEE International Conference on
Conference_Location :
Lviv
Print_ISBN :
978-1-4799-5960-0
DOI :
10.1109/OMEE.2014.6912364
