Ambience-sensitive optical refraction in ferroelectric nano?lms of NaNbO3./sub
Result description
The optical index of refraction n is studied by spectroscopic ellipsometry in electrode-less cube-on-cube-type epitaxial NaNbO3 ?lms with thicknesses of 9?14 nm and anisotropic lattice strain of (0?1)%. The index n is approximately 2.1?2.2 and it exhibits a strong sensitivity to atmospheric-pressure gas ambience. The index n in air signi?cantly exceeds that in an oxygen ambience, with the difference as large as ?n= 0.2. The thermo-optical behaviour n(T) indicates ferroelectric state in the NaNbO3 nano?lms, with the strain-dependent polarization and temperature of phase transition. The observed ambience-sensitive optical refraction is explained using the fundamental connection between refraction and ferroelectric polarization in perovskites, and considering screening of the depolarizing ?eld on ambience-sensitive thermodynamically stable surfaces of the NaNbO3 nano?lms.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Ambience-sensitive optical refraction in ferroelectric nano?lms of NaNbO3./sub
Original language description
The optical index of refraction n is studied by spectroscopic ellipsometry in electrode-less cube-on-cube-type epitaxial NaNbO3 ?lms with thicknesses of 9?14 nm and anisotropic lattice strain of (0?1)%. The index n is approximately 2.1?2.2 and it exhibits a strong sensitivity to atmospheric-pressure gas ambience. The index n in air signi?cantly exceeds that in an oxygen ambience, with the difference as large as ?n= 0.2. The thermo-optical behaviour n(T) indicates ferroelectric state in the NaNbO3 nano?lms, with the strain-dependent polarization and temperature of phase transition. The observed ambience-sensitive optical refraction is explained using the fundamental connection between refraction and ferroelectric polarization in perovskites, and considering screening of the depolarizing ?eld on ambience-sensitive thermodynamically stable surfaces of the NaNbO3 nano?lms.
Czech name
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Czech description
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Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Science and Technology of Advanced Materials
ISSN
1468-6996
e-ISSN
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Volume of the periodical
15
Issue of the periodical within the volume
4
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
6
Pages from-to
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UT code for WoS article
000345025400010
EID of the result in the Scopus database
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Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Condensed matter physics (including formerly solid state physics, supercond.)
Year of implementation
2014