Evolution of NaNO2 in porous matrices |
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| Authors: | C. Tien E. V. Charnaya S. V. Baryshnikov M. K. Lee S. Y. Sun D. Michel W. Böhlmann |
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| Affiliation: | (1) Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan;(2) Fock Institute of Physics, St. Petersburg State University, St. Petersburg, 198504, Russia;(3) Blagoveshchensk State Pedagogical University, Blagoveshchensk, 675002, Russia;(4) Faculty of Physics and Geosciences, University of Leipzig, Leipzig, D-04103, Germany |
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| Abstract: | NMR and dielectric studies of NaNO2 loaded into an SBA-15 mesoporous matrix are reported. The spin-lattice relaxation rate and the 23Na NMR line shift, as well as the permittivity, were measured within a broad temperature interval including the ferroelectric phase transition in NaNO2. The phase transition temperature of sodium nitrite in as-prepared samples was shown to differ substantially from that characteristic of a bulk crystal. The permittivity grows strongly in the vicinity of the phase transition. Heating a sample causes the properties of NaNO2 embedded in pores to gradually approach those of bulk crystals. |
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