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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/68407700:21340/25:00385148

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GF24-10699K" target="_blank" >GF24-10699K: Design relaxorových antiferroelektrických keramik pro skladování energie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physica Scripta

ISSN

0031-8949

e-ISSN

1402-4896

Svazek periodika

100

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

075908

Kód UT WoS článku

001502297200001

EID výsledku v databázi Scopus

2-s2.0-105007884838