Structural study of NaNO 2  embedded into porous glass | Zendy

RysiakiewiczPasek E. | Zendy; Maczka M. | Zendy; Urbanowicz A. | Zendy

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Structural study of NaNO 2 embedded into porous glass

Author(s) -

RysiakiewiczPasek E.,

Maczka M.,

Urbanowicz A.

Publication year - 2007

Publication title -

physica status solidi c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.21

H-Index - 46

eISSN - 1610-1642

pISSN - 1862-6351

DOI - 10.1002/pssc.200673830

Subject(s) - raman spectroscopy , dielectric , materials science , glass transition , porosity , nano , permittivity , phase transition , analytical chemistry (journal) , mineralogy , condensed matter physics , chemistry , composite material , optics , physics , optoelectronics , polymer , chromatography

Temperature‐dependent Raman study of NaNO 2 confined within porous glass with a pore size of 46 nm has been performed. It is demonstrated that the bandwidths and frequencies of the Raman bands as a function of temperature show similar behaviour, but not identical, as those observed for bulk NaNO 2 . This result indicates that the first‐order phase transition mechanism is only slightly modified by embedding NaNO 2 into the porous glass. It seems that formation of “premelted state” is not significant in the studied material, at least up to 40‐50 K above T c . At higher temperatures, however, a significant increase of bandwidth of the 1326 cm –1 band is observed, which could indicate appearance of “premelted” state. The dielectric measurements are consistent with this view since they show large increase of dielectric permittivity above 480 K, well below the NaNO 2 melting temperature (554 K). (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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