A1 Refereed original research article in a scientific journal
Ammonium-ion reorientation and ordering in ND4ReO4 studied by deuteron NMR
Authors: Vuorimaki AH, Ylinen EE
Publisher: ELSEVIER SCIENCE BV
Publication year: 1996
Journal:: Physica B: Condensed Matter
Journal name in source: PHYSICA B
Journal acronym: PHYSICA B
Volume: 225
Issue: 1-2
First page : 121
Last page: 124
Number of pages: 4
ISSN: 0921-4526
DOI: https://doi.org/10.1016/0921-4526(95)00235-9
Abstract
The spin-lattice relaxation time T-1 and the NMR absorption line shape of deuterons in ND4ReO4 were measured in the temperature range from 46 to 294 K. The T-1 versus T curve shows a single minimum and gives the activation energy of 10.5 kJ/mol for the reorientation of the ND4 ion. Above 56 K, the absorption line is averaged by the reorientation, but remains slightly split. The residual splitting decreases in two steps with increasing temperature to a minimum at 110 K, then increases and finally diminishes near the room temperature. The results suggest that the reorientation has no preferred axis and that the ion favours one of the two equilibrium configurations this crystal provides for it.
The spin-lattice relaxation time T-1 and the NMR absorption line shape of deuterons in ND4ReO4 were measured in the temperature range from 46 to 294 K. The T-1 versus T curve shows a single minimum and gives the activation energy of 10.5 kJ/mol for the reorientation of the ND4 ion. Above 56 K, the absorption line is averaged by the reorientation, but remains slightly split. The residual splitting decreases in two steps with increasing temperature to a minimum at 110 K, then increases and finally diminishes near the room temperature. The results suggest that the reorientation has no preferred axis and that the ion favours one of the two equilibrium configurations this crystal provides for it.
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