Abstract
Abstract The temperature dependence of 35Cl and 121,123Sb NQR frequencies was measured in SbCl3·(C6H5)2NH2+Cl− between 77 and 300 K. A phase transition takes place at 108 K and 35Cl NQR lines disappeared above about 275 K. Possible mechanisms of the phase transition and of the disappearance of 35Cl NQR lines were suggested. The phase transition in 2SbCl3·C6H5OCH3 was investigated by the NQR technique. The temperature dependence of the splitting of the 121Sb(ν1) NQR lines in the low-temperature phase gave a critical exponent of β=1⁄2 near the transition point Tc. A Zeeman-effect experiment revealed that the crystals in both low- and high-temperature phases were monoclinic.
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