Polar phonon behaviour in polycrystalline Bi-doped strontium titanate thin films
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00547505" target="_blank" >RIV/68378271:_____/21:00547505 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11104/0323880" target="_blank" >http://hdl.handle.net/11104/0323880</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/ma14216414" target="_blank" >10.3390/ma14216414</a>
Alternative languages
Result language
angličtina
Original language name
Polar phonon behaviour in polycrystalline Bi-doped strontium titanate thin films
Original language description
We study the lattice dynamics in sol–gel-derived Sr1−1.5xBixTiO3 thin films with x = 0.0053 and 0.167, deposited on Al2O3 substrates, using a variable-temperature far-infrared spectroscopy in a transmittance mode. Bi doping, known to induce a low-frequency dielectric relaxation in SrTiO3 (ST) ceramics and films, due to off-centre dopant ion displacements generating electric dipoles, is shown to affect the polar phonon behaviour of thin films. We show that in weakly Bi-doped films, the low-frequency polar TO1 mode softens on cooling but less than in undoped ST. In heavily Bi-doped ST films, this mode displays no significant frequency variation with temperature from 300 to 10 K. The polar phonon behaviour of polycrystalline Bi-doped ST thin films is comparable with that of Bi-doped ST ceramics, which exhibit dielectric relaxations and harden soft-mode behaviour instead of the ferroelectric phase transition.
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
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
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
Materials
ISSN
1996-1944
e-ISSN
1996-1944
Volume of the periodical
14
Issue of the periodical within the volume
21
Country of publishing house
CH - SWITZERLAND
Number of pages
9
Pages from-to
6414
UT code for WoS article
000718389300001
EID of the result in the Scopus database
2-s2.0-85118107971