Nature of the 23Na spin relaxation increase near the ferroelectric phase transition in bulk and confined sodium nitrite

Cheng Tien; E. V. Charnaya; M. K. Lee; S. V. Baryshnikov; D. Michel; W. Böhlmann

doi:10.1080/00150190802363181

Nature of the ²³Na spin relaxation increase near the ferroelectric phase transition in bulk and confined sodium nitrite

Cheng Tien, E. V. Charnaya, M. K. Lee, S. V. Baryshnikov, D. Michel, W. Böhlmann

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Abstract

NMR studies were carried out for ferroelectric NaNO₂ particles embedded into molecular sieves MCM-41 and SBA-15 with various pore sizes. ²³Na spin-lattice relaxation was measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till sodium nitrite melting. Longitudinal nuclear magnetization restoration in the rigid confined sodium nitrite was found to be described well by the model of thermally activated random reorientations of the NO₂ groups. The activation enthalpy of NO₂ reorientations was evaluated above and below the ferroelectric phase transition in confined sodium nitrite. Its values were shown to be similar to that in bulk sodium nitrite.

Original language	English
Pages (from-to)	74-83
Number of pages	10
Journal	Ferroelectrics
Volume	366
Issue number	1
DOIs	https://doi.org/10.1080/00150190802363181
Publication status	Published - 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Nature of the 23Na spin relaxation increase near the ferroelectric phase transition in bulk and confined sodium nitrite",

abstract = "NMR studies were carried out for ferroelectric NaNO2 particles embedded into molecular sieves MCM-41 and SBA-15 with various pore sizes. 23Na spin-lattice relaxation was measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till sodium nitrite melting. Longitudinal nuclear magnetization restoration in the rigid confined sodium nitrite was found to be described well by the model of thermally activated random reorientations of the NO2 groups. The activation enthalpy of NO2 reorientations was evaluated above and below the ferroelectric phase transition in confined sodium nitrite. Its values were shown to be similar to that in bulk sodium nitrite.",

author = "Cheng Tien and Charnaya, {E. V.} and Lee, {M. K.} and Baryshnikov, {S. V.} and D. Michel and W. B{\"o}hlmann",

note = "Funding Information: The present work was supported by Taiwan under Grant OUA 95-21T-2-017, by DFG (Germany) and RFBR (Russia).",

year = "2008",

doi = "10.1080/00150190802363181",

language = "English",

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T1 - Nature of the 23Na spin relaxation increase near the ferroelectric phase transition in bulk and confined sodium nitrite

AU - Tien, Cheng

AU - Charnaya, E. V.

AU - Lee, M. K.

AU - Baryshnikov, S. V.

AU - Michel, D.

AU - Böhlmann, W.

N1 - Funding Information: The present work was supported by Taiwan under Grant OUA 95-21T-2-017, by DFG (Germany) and RFBR (Russia).

PY - 2008

Y1 - 2008

N2 - NMR studies were carried out for ferroelectric NaNO2 particles embedded into molecular sieves MCM-41 and SBA-15 with various pore sizes. 23Na spin-lattice relaxation was measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till sodium nitrite melting. Longitudinal nuclear magnetization restoration in the rigid confined sodium nitrite was found to be described well by the model of thermally activated random reorientations of the NO2 groups. The activation enthalpy of NO2 reorientations was evaluated above and below the ferroelectric phase transition in confined sodium nitrite. Its values were shown to be similar to that in bulk sodium nitrite.

AB - NMR studies were carried out for ferroelectric NaNO2 particles embedded into molecular sieves MCM-41 and SBA-15 with various pore sizes. 23Na spin-lattice relaxation was measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till sodium nitrite melting. Longitudinal nuclear magnetization restoration in the rigid confined sodium nitrite was found to be described well by the model of thermally activated random reorientations of the NO2 groups. The activation enthalpy of NO2 reorientations was evaluated above and below the ferroelectric phase transition in confined sodium nitrite. Its values were shown to be similar to that in bulk sodium nitrite.

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Nature of the ²³Na spin relaxation increase near the ferroelectric phase transition in bulk and confined sodium nitrite

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