Influence of hydrostatic pressure on electrical relaxation in non-homogeneous bismuth manganite - Lead titanate ceramics
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F21%3A50017621" target="_blank" >RIV/62690094:18470/21:50017621 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0925838820335830?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0925838820335830?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jallcom.2020.157219" target="_blank" >10.1016/j.jallcom.2020.157219</a>
Alternative languages
Result language
angličtina
Original language name
Influence of hydrostatic pressure on electrical relaxation in non-homogeneous bismuth manganite - Lead titanate ceramics
Original language description
The composite 0.96 BM-0.04 PT ceramics was sintered from non-polar bismuth manganite (BM) and ferroelectric lead titanate (PT) components. We show influence of small amount of PT on structure ordering of BM. The X-ray pattern analysis showed occurrence of three phases: orthorhombic Pbam related to BiMn2O5, cubic Pn (3) over barm attributed to delta-Bi2O3, and tetragonal P (4) over bar2(1)c related to unrecognized phase Bi20TiO32 isostructural to beta-Bi2O3. Occurrence of these three phases reflected in variation in chemical compositions detected using transmission electron microscopy. Correspondence between nano-structural features of BM-PT and electrical relaxation processes was studied. The DC resistivity temperature dependence exhibited crossover from variable range hopping to nearest-neighbor hopping of small polarons. Furthermore, three electrical relaxations attributed to small polaron hopping were distinguished. Two relaxations corresponded to BM-originated phases. One relaxation exhibited crossover from variable range hopping to nearest-neighbor hopping of small polarons. Second relaxation showed crossover from variable range hopping to Vogel-Fulcher temperature dependence. Third relaxation, related to nearest-neighbor hopping of small polarons, was attributed to Bi20TiO32:Pb phase derived from PT compound. Structural disorder of BM-PT phases reflected in Fermi glass features manifested by variable range hopping of polarons. Moreover, we showed sensitivity of BM-PT ceramics on high hydrostatic pressure. Applied hydrostatic pressure, p = 800 and 1600 MPa, shortened the relaxation times. We propose equation of state for relaxation process related with PT amount doped to BM ceramics. Equation of state of dielectric includes response to varied hydrostatic pressure and temperature, that is to different thermodynamic conditions. Correspondence between effects of applied hydrostatic pressure and presumed chemical pressure was considered as consequence of inter-diffusion of Pb, Bi, Mn, and Ti ions and their mutual substitution. (C) 2020 Elsevier B.V. All rights reserved.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Alloys and Compounds
ISSN
0925-8388
e-ISSN
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Volume of the periodical
854
Issue of the periodical within the volume
February
Country of publishing house
CH - SWITZERLAND
Number of pages
14
Pages from-to
"Article Number: 157219"
UT code for WoS article
000596240800002
EID of the result in the Scopus database
2-s2.0-85091753995