caa a22 4500 463215524 CHVBK 20180405153155.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00339-007-3884-1 doi (NATIONALLICENCE)springer-10.1007/s00339-007-3884-1 Dielectric relaxation in Sr modified PST ceramics [Elektronische Daten] [S. Sen, R.N.P. Choudhary] Nanocrystalline powders of strontium modified PbSn0.15Ti0.85O3 (PST) having the formula Pb0.94Sr0.06Sn0.15 have been synthesized by a precursor solution method. The electrical behavior of Pb0.94Sr0.06Sn0.15Ti0.85O3 sintered pellets has been studied by complex impedance spectroscopy analysis. The plot of the real and imaginary parts of the impedance shows that the semicircle exhibits a depression degree with a distribution of relaxation time. The modulus curve indicates the possibility of non-exponential type conductivity. The values of the activation energy calculated from both plots of Z” and M”, are 1.06 and 1.09eV, which reveals that the species responsible for conduction are same. It also confirms that oxygen vacancies play an important role in conduction. The non-overlapping of the peaks in the plot of M”/M”max and Z”/Z”max as a function of logarithmic frequency measured at 350°C indicates short-range conduction. The compounds exhibit a negative temperature coefficient of resistance with an α value of -5×10-2°C at 375°C. The frequency (ω) dependence of conductivity satisfies the ωn power law. The variation of n with temperature suggests that ac conduction is due to small polaron tunneling. Springer-Verlag, 2007 Sen S. National Metallurgical Laboratory, Jamshedpur, India aut Choudhary R.N.P. Department of Physics and Meteorology, I.I.T. Kharagpur, India aut Applied Physics A Springer-Verlag 87/4(2007-06-01), 727-731 0947-8396 87:4<727 2007 87 339 https://doi.org/10.1007/s00339-007-3884-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3884-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sen S. National Metallurgical Laboratory, Jamshedpur, India aut NATIONALLICENCE 700 1- Choudhary R.N.P. Department of Physics and Meteorology, I.I.T. Kharagpur, India aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 87/4(2007-06-01), 727-731 0947-8396 87:4<727 2007 87 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer