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The temperature dependence o f the  35 Cl NQR frequency and spin-lattice relaxation time T 1Q  of (NH 4 ) 2 SeCl 6  and (ND 4 ) 2 SeCl 6  were measured from 400 K to 24.8 and 53.8 K, respectively. The disappearance of NQR signals in the low temperature region of both salts is attributed to phase transitions. We concluded from the temperature behavior of just above the transition point that the operative mechanism o f the transition is different in these salts: The transition of (ND 4 ) 2 SeCl 6  seems to be associated with rotary soft modes, while in the natural salt non-rotary soft modes seem to play an important role at the transition.

Low Temperature Isotope Effect in Ammonium Hexachloroselenate(IV) Studied by 35 Cl NQR