An x-ray scattering study of Sn2P2S6: absence of incommensurate phase up to 1 GPa
Result description
The ferroelectric phase transition in a semiconductor Sn2P2S6 single crystal has been studied by means of high-resolution synchrotron x-ray diffraction in the pressure?temperature range where an incommensurate modulated phase has been anticipated for many years. In contrast with the predictions, the present measurements reveal only a direct ferroelectric?paraelectric phase transition close to T = 100 K, p = 1.1 GPa. In the vicinity of this phase transition, a characteristic critical diffuse scattering was observed, but no satellite peaks could be resolved there. It is concluded that the earlier hypothesis about the presence of an incommensurate phase and associated Lifshitz point in the temperature?pressure phase diagram of Sn2P2S6 is incorrect.
Keywords
X-ray scatteringphase transitions and Curie pointphase diagrams of other materialsincommensurate crystalsdielectricferroelectric
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
An x-ray scattering study of Sn2P2S6: absence of incommensurate phase up to 1 GPa
Original language description
The ferroelectric phase transition in a semiconductor Sn2P2S6 single crystal has been studied by means of high-resolution synchrotron x-ray diffraction in the pressure?temperature range where an incommensurate modulated phase has been anticipated for many years. In contrast with the predictions, the present measurements reveal only a direct ferroelectric?paraelectric phase transition close to T = 100 K, p = 1.1 GPa. In the vicinity of this phase transition, a characteristic critical diffuse scattering was observed, but no satellite peaks could be resolved there. It is concluded that the earlier hypothesis about the presence of an incommensurate phase and associated Lifshitz point in the temperature?pressure phase diagram of Sn2P2S6 is incorrect.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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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
2013
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 Physics-Condensed Matter
ISSN
0953-8984
e-ISSN
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Volume of the periodical
25
Issue of the periodical within the volume
11
Country of publishing house
GB - UNITED KINGDOM
Number of pages
5
Pages from-to
"115901-1"-"115901-5"
UT code for WoS article
000315597600018
EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BM - Solid-state physics and magnetism
Year of implementation
2013