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The  35 Cl NQR frequency and spin-lattice relaxation rate in the compounds A 2 PbCl 6  (A = Cs, Rb, NH 4 , K) have been investigated in the range 4.2 K to 500 K, and as a function of pressure at room temperature. NQR experiments conducted on (K: NH 4 ) 2 PbCl 6  mixed crystals have been used to complete the NQR-frequency versus temperature diagram of K 2 PbCl 6 , revealing two structural transitions at Tc 1  ≅ 358 K and at T C2  ≅ 333 K.

Temperature and Pressure Variation of the Cl-NQR in A 2 PbCl 6 -Crystals