Conductivity relaxation and oxygen vacancies-related electron hopping mechanism in Pb1-xLax/2Smx/2Ti1-xFexO3 solid solutions

Polycrystalline samples of Pb 1-x La x/2 Sm x/2 Ti 1-x Fe x O 3 (x = 0.20 and 0.30) have been prepared by solid state reaction route. The electrical properties of synthesized samples have been investigated using complex impedance spectroscopy as a function of frequency (100 Hz-1 MHz) within the temp...

Full description

Saved in:
Bibliographic Details
Published inJournal of Asian Ceramic Societies Vol. 6; no. 3; pp. 222 - 231
Main Authors Sharma, Vandana, Kaur, Randeep, Singh, Mandeep, Selvamani, Rachna, Gupta, Surya M., Tiwari, Vidya Sagar, Karnal, A. K., Singh, Anupinder
Format Journal Article
LanguageEnglish
Published Taylor & Francis 03.07.2018
Taylor & Francis Group
Subjects
ac conductivity
Ceramics
complex impedance spectroscopy
Online AccessGet full text

Cover

More Information
Summary:Polycrystalline samples of Pb 1-x La x/2 Sm x/2 Ti 1-x Fe x O 3 (x = 0.20 and 0.30) have been prepared by solid state reaction route. The electrical properties of synthesized samples have been investigated using complex impedance spectroscopy as a function of frequency (100 Hz-1 MHz) within the temperature range of (448-573 K). The fitting of the Nyquist plots reveals that both grain and grain boundary contribute to relaxation and the grain boundaries are more resistive and capacitive than the grains. Modulus analysis shows that relaxation in both the samples is of non-Debye type and temperature independent. The Jonscher`s power law fit to the ac conductivity data confirms that the conduction in the prepared samples is due to the hopping of charge carriers. Long range conductivity type of relaxation is found in both the samples.
ISSN:2187-0764
DOI:10.1080/21870764.2018.1489941