Ferroelectricity and gradual melting in NaNO2 particles confined within porous alumina

Cheng Tien; E. V. Charnaya; D. Yu Podorozhkin; M. K. Lee; S. V. Baryshnikov

doi:10.1002/pssb.200945117

Ferroelectricity and gradual melting in NaNO₂ particles confined within porous alumina

Cheng Tien, E. V. Charnaya, D. Yu Podorozhkin, M. K. Lee, S. V. Baryshnikov

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Abstract

NMR and dielectric studies were carried out for ferroelectric NaNO₂ embedded into porous alumina. ²³Na spin-lattice relaxation and static lineshape were measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till NaNO₂ 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 NaNO₂. Correlation time of molecular mobility in the melted fraction was found and activation enthalpy was estimated.

Original language	English
Pages (from-to)	2346-2351
Number of pages	6
Journal	Physica Status Solidi (B) Basic Research
Volume	246
Issue number	10
DOIs	https://doi.org/10.1002/pssb.200945117
Publication status	Published - 2009 Oct

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "NMR and dielectric studies were carried out for ferroelectric NaNO2 embedded into porous alumina. 23Na spin-lattice relaxation and static lineshape were measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till NaNO2 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 NaNO2. Correlation time of molecular mobility in the melted fraction was found and activation enthalpy was estimated.",

author = "Cheng Tien and Charnaya, {E. V.} and {Yu Podorozhkin}, D. and Lee, {M. K.} and Baryshnikov, {S. V.}",

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AU - Tien, Cheng

AU - Charnaya, E. V.

AU - Yu Podorozhkin, D.

AU - Lee, M. K.

AU - Baryshnikov, S. V.

PY - 2009/10

Y1 - 2009/10

N2 - NMR and dielectric studies were carried out for ferroelectric NaNO2 embedded into porous alumina. 23Na spin-lattice relaxation and static lineshape were measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till NaNO2 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 NaNO2. Correlation time of molecular mobility in the melted fraction was found and activation enthalpy was estimated.

AB - NMR and dielectric studies were carried out for ferroelectric NaNO2 embedded into porous alumina. 23Na spin-lattice relaxation and static lineshape were measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till NaNO2 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 NaNO2. Correlation time of molecular mobility in the melted fraction was found and activation enthalpy was estimated.

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Ferroelectricity and gradual melting in NaNO₂ particles confined within porous alumina

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