Hydrostatic pressure influence on electric relaxation response of bismuth manganite ceramics

Electrical impedance of bismuth manganite ceramics was studied under ambient and high hydrostatic pressure. Local disorder of crystal lattice was confirmed using XRD and DSC. Two relaxation processes were discerned. One was attributed to small polarons, which showed a changeover from variable range...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 2020-06, Vol.103 (6), p.3732-3738
Main Authors: Szeremeta, Anna Z., Pawlus, Sebastian, Nowok, Andrzej, Grzybowska, Katarzyna, Zubko, Maciej, Molak, Andrzej
Format: Article
Language:English
Subjects:
Bismuth
Ceramics
Crystal lattices
dielectric relaxation
differential scanning calorimetry
disorder
Electrical impedance
Energy distribution
Energy levels
Hydrostatic pressure
Manganites
Polarons
pressing
Stress concentration
X‐ray methods
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Electrical impedance of bismuth manganite ceramics was studied under ambient and high hydrostatic pressure. Local disorder of crystal lattice was confirmed using XRD and DSC. Two relaxation processes were discerned. One was attributed to small polarons, which showed a changeover from variable range hopping features related to Fermi glass and structural disorder to the nearest neighbor hopping behavior in higher temperature range related to uniform distribution of energy levels. Hydrostatic pressure shortened relaxation times that would be interesting for applications. The second process, which was assigned to the nearest neighbor hopping of polarons, also exhibited a changeover to glassy features in a high‐temperature range.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17054