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

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)74-83
頁數10
期刊Ferroelectrics
366
發行號1
DOIs
出版狀態Published - 2008

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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