Modulus spectroscopy of lead potassium titanium niobate (Pb0.95K0.1Ti0.25Nb1.8O6) ceramics

The modulus Spectroscopy of Lead Potassium Titanium Niobate (Pb0.95K0.1Ti0.25Nb1.8O6, PKTN) Ceramics was investigated in the frequency range from 45 Hz to 5 MHz and the temperature, from 30 to 600 °C. XRD analysis in PKTN indicated a orthorhombic structure with lattice parameters a = 18.0809 Å, b =...

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Bibliographic Details
Published in:Journal of materials science 2007-07, Vol.42 (13), p.4801-4809
Main Authors: KONAPALA SAMBASIVA RAO, PRAYAGA MURALI KRISHNA, DASARI MADHAVA PRASAD, GANGADHARUDU, D
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Conduction
Dielectric relaxation
Electrical resistivity
Electrotechnical and electronic ceramics
Exact sciences and technology
Exponential functions
Frequency ranges
Impedance
Ion motion
Lattice parameters
Materials science
Niobates
Phase transitions
Potassium
Relaxation time
Space charge
Spectroscopy
Spectrum analysis
Technical ceramics
Temperature
Temperature dependence
Titanium
Transition temperature
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Summary:The modulus Spectroscopy of Lead Potassium Titanium Niobate (Pb0.95K0.1Ti0.25Nb1.8O6, PKTN) Ceramics was investigated in the frequency range from 45 Hz to 5 MHz and the temperature, from 30 to 600 °C. XRD analysis in PKTN indicated a orthorhombic structure with lattice parameters a = 18.0809 Å, b = 18.1909 Å and c = 3.6002 Å. The dielectric anomaly with a peak was observed at 510 °C. Variation of εI and εII with frequency at different temperatures exhibit high values, which reflects the effect of space charge polarization and/or conduction ion motion. The electrical relaxation in ionically conducting PKTN ceramic analyzed in terms of Impedance and Modulus formalism. The Cole–Cole plots of impedance were drawn at different temperatures. The dielectric modulus, which describes the dielectric relaxation behaviour is fitted to the Kohlrausch exponential function. Near the phase transition temperature, a stretched exponential parameter β indicating the degree of distribution of the relaxation time has a small value. From the AC conductivity measurements the activation energy near phase transition temperature (TC°C) has been found to different from that of the above and below TC. The temperature dependence of electrical modulus has been studied and results are discussed.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-0748-6