caa a22 4500 463233026 CHVBK 20180405153248.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-0748-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0748-6 Modulus spectroscopy of lead potassium titanium niobate (Pb0.95K0.1Ti0.25Nb1.8O6) ceramics [Elektronische Daten] [Konapala Rao, Prayaga Krishna, Dasari Prasad, D. Gangadharudu] The modulus Spectroscopy of Lead Potassium Titanium Niobate (Pb0.95K0.1Ti0.25Nb1.8O6, PKTN) Ceramics was investigated in the frequency range from 45Hz to 5MHz and the temperature, from 30 to 600°C. XRD analysis in PKTN indicated a orthorhombic structure with lattice parameters a=18.0809Å, b=18.1909Å and c=3.6002Å. 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 (T C°C) has been found to different from that of the above and below T C. The temperature dependence of electrical modulus has been studied and results are discussed. Springer Science+Business Media, LLC, 2007 Rao Konapala Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut Krishna Prayaga Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut Prasad Dasari Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut Gangadharudu D. Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 4801-4809 0022-2461 42:13<4801 2007 42 10853 https://doi.org/10.1007/s10853-006-0748-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0748-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rao Konapala Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut NATIONALLICENCE 700 1- Krishna Prayaga Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut NATIONALLICENCE 700 1- Prasad Dasari Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut NATIONALLICENCE 700 1- Gangadharudu D. Centre for Piezoelectric Transducer Materials, Physics Department, Andhra University, 530 003, Visakhapatnam, India aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 4801-4809 0022-2461 42:13<4801 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer