Coexistence of melted and ferroelectric states in sodium nitrite within mesoporous sieves

Cheng Tien, E. V. Charnaya, Min-Kai Lee, S. V. Baryshnikov, S. Y. Sun, D. Michel, W. Böhlmann

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Results of NMR studies of Na23 in NaNO2 confined within molecular sieves MCM-41 with pore size 37 and 20 and SBA-15 with pore size 52 are presented. Na23 spin-lattice relaxation and line shape were measured in a large temperature range up to 535 K covering the bulk ferroelectric phase transition point. It is shown that confined NaNO2 below the bulk sodium nitrite melting point consists of two parts with relaxation times which differ by two orders in magnitude. A portion of NaNO2 exhibits bulk-like properties with the ferroelectric phase transition in the vicinity of the bulk transition temperature. The bulk-like NaNO2 prevails below and near the ferroelectric phase transition and its amount decreases strongly when temperature approaches the bulk melting point. Fast nuclear relaxation in another portion of confined NaNO2 revealed very high molecular mobility. This portion increases with increasing temperature and dominates above 510 K. It was suggested that fast relaxation corresponds to the melted or premelted state of confined NaNO2 caused by confinement. Temperature evolution of the Na23 NMR line confirms such a suggestion. The amount of NaNO2 which possesses high molecular mobility depends on pore size and is maximal for the MCM-41 porous matrix with 20 pore size. The correlation time of electric field gradient fluctuations was found for this part to be similar to those in viscous liquids with the activation energy of about 0.42 eV.

Original languageEnglish
Article number104105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number10
DOIs
Publication statusPublished - 2005 Sep 1

Fingerprint

Sodium Nitrite
sieves
Sieves
nitrites
Ferroelectric materials
Pore size
Sodium
sodium
porosity
Phase transitions
Multicarrier modulation
melting points
Melting point
Nuclear magnetic resonance
nuclear relaxation
Temperature
nuclear magnetic resonance
temperature
Spin-lattice relaxation
Molecular sieves

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Tien, Cheng ; Charnaya, E. V. ; Lee, Min-Kai ; Baryshnikov, S. V. ; Sun, S. Y. ; Michel, D. ; Böhlmann, W. / Coexistence of melted and ferroelectric states in sodium nitrite within mesoporous sieves. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 72, No. 10.
@article{db8aefd826594f5bab08dbea9e1654f9,
title = "Coexistence of melted and ferroelectric states in sodium nitrite within mesoporous sieves",
abstract = "Results of NMR studies of Na23 in NaNO2 confined within molecular sieves MCM-41 with pore size 37 and 20 and SBA-15 with pore size 52 are presented. Na23 spin-lattice relaxation and line shape were measured in a large temperature range up to 535 K covering the bulk ferroelectric phase transition point. It is shown that confined NaNO2 below the bulk sodium nitrite melting point consists of two parts with relaxation times which differ by two orders in magnitude. A portion of NaNO2 exhibits bulk-like properties with the ferroelectric phase transition in the vicinity of the bulk transition temperature. The bulk-like NaNO2 prevails below and near the ferroelectric phase transition and its amount decreases strongly when temperature approaches the bulk melting point. Fast nuclear relaxation in another portion of confined NaNO2 revealed very high molecular mobility. This portion increases with increasing temperature and dominates above 510 K. It was suggested that fast relaxation corresponds to the melted or premelted state of confined NaNO2 caused by confinement. Temperature evolution of the Na23 NMR line confirms such a suggestion. The amount of NaNO2 which possesses high molecular mobility depends on pore size and is maximal for the MCM-41 porous matrix with 20 pore size. The correlation time of electric field gradient fluctuations was found for this part to be similar to those in viscous liquids with the activation energy of about 0.42 eV.",
author = "Cheng Tien and Charnaya, {E. V.} and Min-Kai Lee and Baryshnikov, {S. V.} and Sun, {S. Y.} and D. Michel and W. B{\"o}hlmann",
year = "2005",
month = "9",
day = "1",
doi = "10.1103/PhysRevB.72.104105",
language = "English",
volume = "72",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "10",

}

Coexistence of melted and ferroelectric states in sodium nitrite within mesoporous sieves. / Tien, Cheng; Charnaya, E. V.; Lee, Min-Kai; Baryshnikov, S. V.; Sun, S. Y.; Michel, D.; Böhlmann, W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 10, 104105, 01.09.2005.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Coexistence of melted and ferroelectric states in sodium nitrite within mesoporous sieves

AU - Tien, Cheng

AU - Charnaya, E. V.

AU - Lee, Min-Kai

AU - Baryshnikov, S. V.

AU - Sun, S. Y.

AU - Michel, D.

AU - Böhlmann, W.

PY - 2005/9/1

Y1 - 2005/9/1

N2 - Results of NMR studies of Na23 in NaNO2 confined within molecular sieves MCM-41 with pore size 37 and 20 and SBA-15 with pore size 52 are presented. Na23 spin-lattice relaxation and line shape were measured in a large temperature range up to 535 K covering the bulk ferroelectric phase transition point. It is shown that confined NaNO2 below the bulk sodium nitrite melting point consists of two parts with relaxation times which differ by two orders in magnitude. A portion of NaNO2 exhibits bulk-like properties with the ferroelectric phase transition in the vicinity of the bulk transition temperature. The bulk-like NaNO2 prevails below and near the ferroelectric phase transition and its amount decreases strongly when temperature approaches the bulk melting point. Fast nuclear relaxation in another portion of confined NaNO2 revealed very high molecular mobility. This portion increases with increasing temperature and dominates above 510 K. It was suggested that fast relaxation corresponds to the melted or premelted state of confined NaNO2 caused by confinement. Temperature evolution of the Na23 NMR line confirms such a suggestion. The amount of NaNO2 which possesses high molecular mobility depends on pore size and is maximal for the MCM-41 porous matrix with 20 pore size. The correlation time of electric field gradient fluctuations was found for this part to be similar to those in viscous liquids with the activation energy of about 0.42 eV.

AB - Results of NMR studies of Na23 in NaNO2 confined within molecular sieves MCM-41 with pore size 37 and 20 and SBA-15 with pore size 52 are presented. Na23 spin-lattice relaxation and line shape were measured in a large temperature range up to 535 K covering the bulk ferroelectric phase transition point. It is shown that confined NaNO2 below the bulk sodium nitrite melting point consists of two parts with relaxation times which differ by two orders in magnitude. A portion of NaNO2 exhibits bulk-like properties with the ferroelectric phase transition in the vicinity of the bulk transition temperature. The bulk-like NaNO2 prevails below and near the ferroelectric phase transition and its amount decreases strongly when temperature approaches the bulk melting point. Fast nuclear relaxation in another portion of confined NaNO2 revealed very high molecular mobility. This portion increases with increasing temperature and dominates above 510 K. It was suggested that fast relaxation corresponds to the melted or premelted state of confined NaNO2 caused by confinement. Temperature evolution of the Na23 NMR line confirms such a suggestion. The amount of NaNO2 which possesses high molecular mobility depends on pore size and is maximal for the MCM-41 porous matrix with 20 pore size. The correlation time of electric field gradient fluctuations was found for this part to be similar to those in viscous liquids with the activation energy of about 0.42 eV.

UR - http://www.scopus.com/inward/record.url?scp=29644434188&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=29644434188&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.72.104105

DO - 10.1103/PhysRevB.72.104105

M3 - Article

AN - SCOPUS:29644434188

VL - 72

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 10

M1 - 104105

ER -