Počet záznamů: 1

The negative phonon confinement effect in nanoscopic sodium nitrite

SYSNO ASEP	0330274
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	The negative phonon confinement effect in nanoscopic sodium nitrite
Překlad názvu	Negativní vliv rozměrového efektu na fonony v nanoskopickém NaNO₂.
Tvůrce(i)	Koroleva, E.Yu. (RU) Nuzhnyy, Dmitry (FZU-D)_{RID, ORCID} Pokorný, Jan (FZU-D)_{RID, ORCID} Kamba, Stanislav (FZU-D)_{RID, ORCID, SAI} Kumzerov, Y. A. (RU) Vakhrushev, S. B. (RU) Petzelt, Jan (FZU-D)_{RID, ORCID, SAI}
Zdroj.dok.	Nanotechnology. - : Institute of Physics Publishing - ISSN 0957-4484 Roč. 20, č. 39 (2009), 395706/1-395706/7
Poč.str.	7 s.
Jazyk dok.	eng - angličtina
Země vyd.	GB - Velká Británie
Klíč. slova	nanocomposite ; sodium nitrite ; infrared ; THz ; Raman ; phonon ; effective medium approach
Vědní obor RIV	BM - Fyzika pevných látek a magnetismus
CEP	KJB100100704 GA AV ČR - Akademie věd
	GA202/09/0682 GA ČR - Grantová agentura ČR
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000269553500017
DOI	10.1088/0957-4484/20/39/395706
Anotace	A nanocomposite of porous glass and a NaNO2 ferroelectric (channels of 7 nm diameter) was studied using infrared reflectivity, THz transmission and Raman spectroscopy as a function of temperature in the range of 300-500 K, including the ferroelectric transition. From the infrared and THz response the effective dielectric function was calculated and compared with the dielectric functions calculated from the Bruggeman and Lichtenecker models of the effective medium, using the known data on the polar phonon modes of the NaNO2 single crystals. The results show good qualitative agreement, indicating that the stiffening of the effective modes is due to local depolarization fields on the glass-ferroelectric interfaces. The nonpolar Raman modes show no substantial modification compared to those of the bulk NaNO2. Some signatures of the ferroelectric transition were even seen. The results indicate that the intrinsic size effect (phonon confinement) is negligible in this nanocomposite.
Pracoviště	Fyzikální ústav
Kontakt	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Rok sběru	2010

Počet záznamů: 1