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Properties of Pb0.71K0.145Sm0.145Nb2O6 analysed within piezoelectric, dielectric, impedance, electric modulus and conductivity
Published online by Cambridge University Press: 09 April 2008
Abstract
Orthorhombic tungsten bronze Pb$_{1-x}$K$_{2x-3y}$
SmyNb2O6
(where x = 0.29 and y = 0.145) ceramic has been synthesized by the
conventional sintering technique. Preliminary X-ray diffractogram analysis
of crystal structure showed that a single phase compound has been formed
with orthorhombic system. Frequency and temperature dependences of
impedance, modulus, conductivity and dielectric permittivity have been
performed in the frequency and temperature range 45 Hz–5 MHz and 35–595 °C respectively. Impedance spectroscopy study showed the presence
of both bulk and grain boundary effects in the materials. The complex
impedance spectra above 440 °C have been fitted by the superposition of
two Cole-Cole types of relaxations. The ac conductivity spectrum obeyed the
Jonscher's power law. Modulus analysis indicated the possibility of hopping
mechanism for electrical process in the system.
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- © EDP Sciences, 2008
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