NMR study of ammonium reorientation motion in NH<sub>4</sub>Br at high pressure
D P Kozlenko; S Lewicki; J Wasicki; W Nawrocik; B N Savenko
Журнал:
Journal of Physics: Condensed Matter
Дата:
1999-09-20
Аннотация:
Measurements of spin-lattice relaxation time T<sub>1</sub> have been performed for polycrystalline ammonium bromide as a function of hydrostatic pressure and temperature. Activation parameters for NH<sub>4</sub><sup>+</sup> ion reorientation as functions of pressure were obtained. A two-well potential model is proposed for description of ammonium reorientation motion. On the basis of the proposed model and obtained activation data the libration frequency of the ammonium ion as a function of pressure was calculated and good agreement between experiment and calculation was obtained.
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