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

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.

Keywords:

Acknowledgments

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

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Order Reprints Request Corporate Permissions

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

Request Academic Permissions

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.

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

Information for

Open access

Opportunities

Help and information

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

Abstract

Acknowledgments

Reprints and Corporate Permissions

Academic Permissions

Related research

To cite this article:

Download citation

Information for

Open access

Opportunities

Help and information

Keep up to date

Your download is now in progress and you may close this window

Login or register to access this feature

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