Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3
Access Status
Authors
Date
2017Type
Metadata
Show full item recordCitation
Source Title
ISSN
School
Collection
Abstract
The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO 3 ceramics by tuning the ratio of Fe 2+ /Fe 3+ through substituting Al for Fe. The ratio of Fe 2+ /Fe 3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al 3+ . Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe 2+ /Fe 3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/? 2 0 , where ? 0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides.
Related items
Showing items related by title, author, creator and subject.
-
Golovanevskiy, Vladimir; Gainov, R.; Klekovkina, V.; Dooglav, A.; Vagizov, F.; Pen'kov, I.; Proshin, Y. (2012)Chalcogenide minerals exhibit a fascinating variety of crystal-chemistry and physical properties that is of both scientific interest and potential practical application value. The role of ternary chalcogenide CuFeS2 ...
-
Schubert, E.; North, Adrian; Hargreaves, D. (2016)A framework for organizing the semantic structure of aesthetic experience is proposed. The new framework is presented in an 'affect-space' and consists of three sets of dichotomous classifications: (1) internal locus ...
-
Glasser, Leslie; Von Szentpaly, L. (2006)Classical procedures to calculate ion-based lattice potential energies (UPOT) assume formal integral charges on the structural units; consequently, poor results are anticipated when significant covalency is present. To ...