Revisiting phonons and the phase transition sequence in antiferroelectric Pb0.98La0.02(Zr0.95Ti0.05)O3

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00637062" target="_blank" >RIV/68378271:_____/25:00637062 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/25:00385148
Result on the web
<a href="https://hdl.handle.net/11104/0369976" target="_blank" >https://hdl.handle.net/11104/0369976</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1402-4896/addc4a" target="_blank" >10.1088/1402-4896/addc4a</a>

Result language
angličtina
Original language name
Revisiting phonons and the phase transition sequence in antiferroelectric Pb0.98La0.02(Zr0.95Ti0.05)O3
Original language description
The changes induced in Pb0.98La0.02(Zr0.95Ti0.05)O3 (PLZT 2/95/5) by 2% of La substitution and its impact on the phase transition sequence were investigated by using Raman spectroscopy, differential scanning calorimetry, and X-ray diffraction to improve the understanding of the switching dynamics of antiferroelectric-ferroelectric systems. Comparison with Pb(Zr0.95Ti0.05)O3 confirms that the La substitution alters the Pb dynamics and suppresses the polar order, stabilising the antipolar state already at high temperatures. On cooling from the cubic paraelectric phase, the calorimetric data revealed a small anomaly near T'~500 K corresponding to a region where the material appears macroscopically cubic, but it is locally distorted. Then an antiferroelectric incommensurate phase appears below TC ~ 483 K, characterised by new Raman modes and three main soft modes: an antiferrodistortive soft mode, an antipolar soft mode, and a weaker soft mode at very low frequencies, related to the incommensurate positions of Pb, the amplitudon, which disappears when the material enters another antiferroelectric phase. The average symmetry of the intermediate incommensurate antiferroelectric phase is likely orthorhombic with the proposed Imma space group.n
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GF24-10699K" target="_blank" >GF24-10699K: Tailoring Relaxor Antiferroelectric Ceramics for Energy Storage</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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