NMR study of proton dynamics in ferroelectric KIO₃*2HIO₃ crystal

• Published in: Functional Materials
• Date: 2008
• Main Authors: Baisa, D.F., Chesnokov, E.D., Ovcharenko, A.I., Vertegel, I.G.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2008
• Subjects: Characterization and properties
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/137248
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: NMR study of proton dynamics in ferroelectric KIO₃*2HIO₃ crystal / D.F. Baisa, E.D. Chesnokov, A.I. Ovcharenko, I.G. Vertegel // Functional Materials. — 2008. — Т. 15, № 1. — С. 19-22. — Бібліогр.: 8 назв. — англ.

The temperature dependence of the proton spin-lattice relaxation time T₁ has been studied in ferroelectric KIO₃*2HIO₃ crystal. It is shown that the proton jumping along 0—H....0 contact has been shown to be the main relaxation mechanism. At temperatures exceeding the phase transition one, e>Tc, the proton relaxation is caused by the motion thereof in symmetric two-well potential of the hydrogen bond with activation energy Ec = 3.4 kcal/mol. At T<Tc, the proton ordering in asymmetric two-well potential occurs with activation energies Ea1 = 4.1 kcal/mol and Ea2 = 2.5 kcal/mol. Evaluation of equilibrium constant value a = p₁/p₁, where p₁ and p₁ are the probabilities of proton being in position "1" or "2" of double-well potential near Tc, gives the value a≈40, but yet at Tc,—T ≈ 50 K, a≈450, thus evidencing a high proton ordering degree on H-bond below the phase transition.