Phase Transition Study of NaNbO3 Thin Films by Spectral Ellipsometry

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Phase Transition Study of NaNbO3 Thin Films by Spectral Ellipsometry

Popis výsledku v původním jazyce

In this work the thermo-optical properties at the wide temperature range (5-820 K) of sodium niobate NaNbO3 (NN) thin films were investigated by means of the spectroscopic ellipsometry. NN thin films were deposited by the pulsed laser ablation techniqueon Si/SiO2/Ti/Pt/SrRuO3 substrates. Temperature dependence of complex refractive index dispersions and optical bang energy of direct allowed electron transitions were evaluated. Additionally dynamic scans of main ellipsometric angles at several fixed wavelengths of 300, 400, 500 and 635 nm were performed to acquire more detailed temperature dependencies of refractive index and extinction coefficient. Pronounced minima/maxima and substantial jumps in the temperature dependence of complex refractive indexand band gap energy were found and are corresponded to the structural phase transition temperatures of NN single crystals and ceramics. Observed negative thermo-optical effect in NN films is discussed as well.

Název v anglickém jazyce

Phase Transition Study of NaNbO3 Thin Films by Spectral Ellipsometry

Popis výsledku anglicky

In this work the thermo-optical properties at the wide temperature range (5-820 K) of sodium niobate NaNbO3 (NN) thin films were investigated by means of the spectroscopic ellipsometry. NN thin films were deposited by the pulsed laser ablation techniqueon Si/SiO2/Ti/Pt/SrRuO3 substrates. Temperature dependence of complex refractive index dispersions and optical bang energy of direct allowed electron transitions were evaluated. Additionally dynamic scans of main ellipsometric angles at several fixed wavelengths of 300, 400, 500 and 635 nm were performed to acquire more detailed temperature dependencies of refractive index and extinction coefficient. Pronounced minima/maxima and substantial jumps in the temperature dependence of complex refractive indexand band gap energy were found and are corresponded to the structural phase transition temperatures of NN single crystals and ceramics. Observed negative thermo-optical effect in NN films is discussed as well.

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název statě ve sborníku

Workshop 2010

ISBN

978-80-01-04513-8

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

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Název nakladatele

České vysoké učení technické v Praze

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

22. 2. 2010

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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