The effect of surface termination on dielectric nonlinearity in potassium sodium niobate thin films
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43933652" target="_blank" >RIV/60461373:22310/25:43933652 - isvavai.cz</a>
Result on the web
<a href="https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.70084" target="_blank" >https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.70084</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/jace.70084" target="_blank" >10.1111/jace.70084</a>
Alternative languages
Result language
angličtina
Original language name
The effect of surface termination on dielectric nonlinearity in potassium sodium niobate thin films
Original language description
The impact of alkali-rich and alkali-depleted surface terminations on dielectric nonlinearity and ferroelectric properties was investigated in sputtered K0.5Na0.5NbO3 (KNN) films. For the alkali depleted surface termination, a similar to 3 nm thick amorphous interfacial layer was found near the top electrode. The presence of a non-ferroelectric interfacial layer reduces both the net remanent (Pr) and maximum polarization (Pmax) while increasing the coercive field (Ec) in the KNN films. Pmax decreased from 31.5 to 30.3 mu C/cm2, likely due to the reduced electric field in the bulk of the film. The influence of the interfacial layer on dielectric properties was evaluated using a capacitor in series model. After removing the effects of the interfacial layer, the Rayleigh coefficients epsilon init and alpha increased by 11 and 47%, respectively. The interfacial layer has more impact on irreversible domain wall motion than on reversible contributions to the relative permittivity. It is believed that this occurs because a higher concentration of defects, such as VK,Na '$V_{{mathrm{K}},{mathrm{Na}}}<^>{prime}$ or VO<middle dot><middle dot>$V_{mathrm{O}}<^>{ cdot cdot }$, associated with the alkali-depleted interfacial layer generates internal fields that pin domain walls. Alkali depleted surface terminations also produce a higher pseudo-activation energy for polarization reversal compared to films with alkali rich terminations, with deeper potential wells in the material's energy landscape.
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
20500 - Materials engineering
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
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 THE AMERICAN CERAMIC SOCIETY
ISSN
0002-7820
e-ISSN
1551-2916
Volume of the periodical
108
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
nestránkováno
UT code for WoS article
001526834800001
EID of the result in the Scopus database
2-s2.0-105010701233