A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Ammonium-ion reorientation and ordering in ND4ReO4 studied by deuteron NMR
Tekijät: Vuorimaki AH, Ylinen EE
Kustantaja: ELSEVIER SCIENCE BV
Julkaisuvuosi: 1996
Lehti:: Physica B: Condensed Matter
Tietokannassa oleva lehden nimi: PHYSICA B
Lehden akronyymi: PHYSICA B
Vuosikerta: 225
Numero: 1-2
Aloitussivu: 121
Lopetussivu: 124
Sivujen määrä: 4
ISSN: 0921-4526
DOI: https://doi.org/10.1016/0921-4526(95)00235-9
Tiivistelmä
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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