Open AccessEnhanced electrical conductivity in Zr-Doped (La0.7Ba0.3)(Mn0.5Fe0.5)O3 solid solutions
Author(s) -
Yogesh Kumar,
Jaswinder Pal,
Parambir Singh Malhi,
Rakesh Kumar
Publication year - 2020
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x20500320
Subject(s) - perovskite (structure) , materials science , polaron , conductivity , condensed matter physics , dielectric spectroscopy , relaxation (psychology) , electrical resistivity and conductivity , dielectric , analytical chemistry (journal) , debye , ceramic , temperature coefficient , thermodynamics , physics , crystallography , quantum mechanics , chemistry , electrode , electrochemistry , psychology , social psychology , optoelectronics , chromatography , composite material , electron
The perovskite ([Formula: see text][Formula: see text]([Formula: see text][Formula: see text][Formula: see text]O 3 , where [Formula: see text] = 0.1, 0.2 and 0.3, ceramics were synthesized by solid-state reaction method. The introductory structural studies were followed through by X-ray diffraction technique and the results have disclosed that all the samples were crystallized into an isolated phase. The Zr substitution in the resulting solid solutions increases the electrical conductivity and the maximum value of ac conductivity has been found to be [Formula: see text]118.8 S [Formula: see text] cm[Formula: see text] for [Formula: see text] = 0.3 at 200[Formula: see text]C (at 1 MHz). The frequency dependence of ac conductivity data follows Jonscher’s power law. The variation of the exponent [Formula: see text] versus temperature follows the nonoverlapping small polaron tunneling (NSPT) model. The dielectric relaxation has been observed to be of non-Debye nature for all measuring temperatures (50–200[Formula: see text]C). The impedance spectroscopy reveals that all the samples exhibit negative temperature coefficient of resistance (NTCR) behavior. The prepared samples (for [Formula: see text] > 1) are supposed to be suitable for cathode materials in SOFCs.