Polar modes in K0.5Na0.5NbO3 ceramics

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F09%3A00331750" target="_blank" >RIV/68378271:_____/09:00331750 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Polar modes in K0.5Na0.5NbO3 ceramics

Original language description

Phonons in K0.5Na0.5NbO3 (KNN-50) ceramics were investigated from 10 to 900 K by means of Raman, infrared and THz spectroscopy. A first-order phase transition was detected from cubic to tetragonal phases at about 710 K, when the first component of the polarization appears. Transition from the tetragonal to the orthorhombic phase takes place around 475 K. The last transition from orthorhombic to rhombohedral phases is strongly first order. Tc is about 90 K and all Raman active modes below 100 cm-1 disappear. An overdamped soft mode is present at high temperatures in the THz range but another excitation below phonons is needed to explain the static value of the permittivity.

Czech name

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Czech description

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Type

J_x - 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

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)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2009

Confidentiality

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

Name of the periodical

Ferroelectrics

ISSN

0015-0193

e-ISSN

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Volume of the periodical

391

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

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UT code for WoS article

000272607100008

EID of the result in the Scopus database

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