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Hydrostatic pressure influence on electric relaxation response of bismuth manganite ceramics
Author(s) -
Szeremeta Anna Z.,
Pawlus Sebastian,
Nowok Andrzej,
Grzybowska Katarzyna,
Zubko Maciej,
Molak Andrzej
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17054
Subject(s) - manganite , condensed matter physics , hydrostatic pressure , materials science , relaxation (psychology) , polaron , changeover , electrical resistivity and conductivity , ceramic , atmospheric temperature range , mineralogy , thermodynamics , chemistry , physics , composite material , ferromagnetism , psychology , social psychology , quantum mechanics , voltage , electron
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.