Abstract
The temperature dependence of NQR frequencies is studied in CuBr2 and MgBr2·Et2O. In CuBr2 the resonance disappears as the temperature is decreased between 77 and 105 K. Since this may be related to a paramagnetic-antiferromagnetic phase transition, the corresponding Neel temperature is much lower than the value 193 K reported in the literature. In MgBr2·Et2O a phase transition associated with a change in the conformation of the ether molecule is clearly seen in the NQR frequency vs temperature diagram.
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