Dielectric and NMR studies of nanoporous matrices loaded with sodium nitrite |
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| Authors: | S V Baryshnikov E V Stukova E V Charnaya C Tien M K Lee W Böhlmann D Michel |
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| Institution: | (1) Blagoveshchensk State Pedagogical University, Blagoveshchensk, 675002, Russia;(2) Department of Physics, National Cheng Kung University, Tainan, 71001, Taiwan;(3) Fock Institute of Physics, St. Petersburg State University, ul. Pervogo maya 100, Petrodvorets, St. Petersburg, 198504, Russia;(4) Faculty of Physics and Geosciences, University of Leipzig, Leipzig, D-04103, Germany |
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| 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. |
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