Dielectric and NMR studies of nanoporous matrices loaded with sodium nitrite

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

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

NMR and dielectric studies have been performed on NaNO2 loaded in mesoporous matrices of MCM-41 and SBA-15 with pore sizes of 20, 37, and 52 Å. The spin-lattice relaxation rate and 23Na NMR line shape, as well as the complex impedance, were measured within a broad temperature interval including the ferroelectric phase transition in bulk NaNO2. Two different phases of sodium nitrite, the crystalline and melt phases, are shown to coexist under conditions of a restricted geometry. The crystalline phase undergoes a ferroelectric phase transition. The melt fraction increases with temperature. The existence of two phases accounts for all experimental data on NaNO2 under conditions of a restricted geometry.

Original languageEnglish
Pages (from-to)593-599
Number of pages7
JournalPhysics of the Solid State
Volume48
Issue number3
DOIs
Publication statusPublished - 2006 Mar

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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