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Ferroelectricity and gradual melting in NaNO 2 particles confined within porous alumina
Author(s) -
Tien Cheng,
Charnaya E. V.,
Podorozhkin D. Yu.,
Lee M. K.,
Baryshnikov S. V.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945117
Subject(s) - ferroelectricity , materials science , enthalpy , phase transition , porosity , sodium nitrite , dielectric , relaxation (psychology) , atmospheric temperature range , phase (matter) , sodium , analytical chemistry (journal) , thermodynamics , chemistry , composite material , organic chemistry , metallurgy , psychology , social psychology , physics , optoelectronics
NMR and dielectric studies were carried out for ferroelectric NaNO 2 embedded into porous alumina. 23 Na spin‐lattice relaxation and static lineshape were measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till NaNO 2 melting. The coexistence of the crystalline and melted states of confined sodium nitrite was observed above 400 K, gradual melting being over at about 510 K. The solid portion of confined sodium nitrite bore ferroelectricity with phase transition temperature higher than that in bulk NaNO 2 . Correlation time of molecular mobility in the melted fraction was found and activation enthalpy was estimated.