Lattice modes in paraelectric La1/2Na1/2TiO3 by infrared and Raman spectroscopy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F13%3A00391702" target="_blank" >RIV/68378271:_____/13:00391702 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/0953-8984/25/8/085901" target="_blank" >http://dx.doi.org/10.1088/0953-8984/25/8/085901</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/0953-8984/25/8/085901" target="_blank" >10.1088/0953-8984/25/8/085901</a>

Result language
angličtina
Original language name
Lattice modes in paraelectric La1/2Na1/2TiO3 by infrared and Raman spectroscopy
Original language description
The lattice dynamics of La1/2Na1/2TiO3 single crystal have been investigated by far-infrared and Raman scattering spectroscopy. Far-IR reflectivity spectra revealed Slater, Last and Axe modes near 140, 190 and 555 cm-1, respectively. The frequency of theSlater mode decreases by about 10% on cooling, which is enough to account for the observed increase of the low-frequency permittivity. The results allowed us to discuss the reasons for the suppressed ferroelectricity of the material. Temperature evolution of the Raman scattering intensity of an oxygen octahedra bending mode near 455 cm-1 suggests a second-order phase transition towards the perovskite aristotype phase near 870 K.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
<a href="/en/project/GAP204%2F10%2F0616" target="_blank" >GAP204/10/0616: Modern piezoelectric perovskites: lattice vibrations and domain walls</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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