Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3.

Authors :: Ni, Wei
Ye, Jianglin
Guo, Youmin
Cheng, Chao
Lin, Zhongqin
Li, Yide
Wang, Hong
Yu, Yi
Li, Qiuju
Huang, Shouguo
Shao, Zongping
Wang, Chunchang
Source :: Journal of the American Ceramic Society; Jul2017, Vol. 100 Issue 7, p3042-3049, 8p
Publication Year :: 2017
Abstract: The role of mixed-valence structure in colossal dielectric constant ( CDC) behavior has been investigated in LaFeO<subscript>3</subscript> ceramics by tuning the ratio of Fe<superscript>2+</superscript>/Fe<superscript>3+</superscript> through substituting Al for Fe. The ratio of Fe<superscript>2+</superscript>/Fe<superscript>3+</superscript> is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al<superscript>3+</superscript>. Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe<superscript>2+</superscript>/Fe<superscript>3+</superscript> follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to [ABSTRACT FROM AUTHOR]

Subjects :: PERMITTIVITY
POLARONS
TRANSITION metals
METALLIC oxides
ACTIVATION energy

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