Abstract
The 1H nuclear magnetic resonance (NMR) spin–lattice relaxation time ( T 1), the spin–lattice relaxation time in a rotating flame ( T 1ρ), Gd 3+ electron spin resonance (ESR) spectra and differential thermal analysis (DTA) were measured for Sm(NO 3) 3·6H 2O. A new thermal anomaly was detected by DTA at 183 K during the heating process. The temperature dependence of T 1ρ could be explained by the motion of four kinds of water molecule. The activation energies and the correlation times at infinite temperature for each water molecule were estimated from T 1ρ. In phase III, hysteresis of T 1ρ, which is considered to be caused by the crystallization water molecules, was observed. From the results of 1H-NMR T 1 and doped Gd 3+ ESR spectra, the electron spin–lattice relaxation of Sm 3+ proved to be dominated by the Orbach process which occurs through the second excited state caused by the crystal field.
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