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Ferroelectrics Volume 366, 2008 - Issue 1
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Original Articles

Nature of the 23Na Spin Relaxation Increase Near the Ferroelectric Phase Transition in Bulk and Confined Sodium Nitrite

Cheng Tien Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan, ROC; Center for Micro/Nano Science of Technology, National Cheng Kung University, Tainan, 70101, Taiwan
,
E. V. Charnaya Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan, ROC; Institute of Physics, St. Petersburg State University, St. Petersburg, Petrodvorets, 198504, Russia
,
M. K. Lee Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan, ROC
,
S. V. Baryshnikov Blagoveschensk State Pedagogical University, Blagoveschensk, 675002, Russia
,
D. Michel Faculty of Physics and Geosciences, University of Leipzig, Leipzig, D-04103, Germany
&
W. Böhlmann Faculty of Physics and Geosciences, University of Leipzig, Leipzig, D-04103, Germany
Pages 74-83 | Received 15 Sep 2007, Published online: 20 Sep 2010
 
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Abstract

NMR studies were carried out for ferroelectric NaNO 2 particles embedded into molecular sieves MCM-41 and SBA-15 with various pore sizes. 23 Na 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 NO 2 groups. The activation enthalpy of NO 2 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.

Acknowledgments

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

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