✍ Scribed by A. Avogadro; E. Cavelius; D. Müller; J. Petersson
No coin nor oath required. For personal study only.
The nuclear‐spin‐lattice relaxation time T~1~ of ^23^Na in NaNO~2~ single crystals is measured between room temperature and 200 °C. The experimental method employed consists of a very long saturation sequence of 90° pulses. The results indicate the existence of a logarithmic singularity of the relaxation rate if the phase transition is approached from both the paraelectric and ferroelectric phase. In addition a discontinuity of T~1~ is observed at the transition of the paraelectric‐antiferroelectric type. The critical behaviour of the spin‐lattice relaxation rate of ^23^Na in NaNO~2~ is described, theoretically by applying the thermodynamics of the ferroelectric phase transition.
📜 SIMILAR VOLUMES
Saturation behavior of allowed and forbidden ESR transition K) was smaller by a factor of three from that ( Ç287 K) of AsO 40 4 paramagnetic probe in KH 2 AsO 4 was studied in the estimated from specific heat measurements (5). However, wide temperature interval around the paraelectric -ferroelectric