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The pressure dependence of the  35 Cl-NQR frequencies in barium chlorate monohydrate and strontium chlorate, has been investigated up to 7000 kg cm -2 . Ba(ClO 3 ) 2  · H 2 O shows a single  35 Cl-NQR line at 29.337 MHz (T = 297 K, p = 1 bar). ν( 35 Cl) increases linearly with pressure in the range studied, with (1/ν )(∂ν/∂p) T  = + 0.409 x 10 -6  kg -1  cm 2  which is much smaller than observed in NaClO 3  and KCIO 3 . Sr(ClO 3 ) 2  also gave a single  35 Cl-NQR frequency at 20.105 MHz (T = 297 K, p = 1 bar). The pressure dependence is very small and negative in this case. The data in both cases have been analysed to obtain the volume dependence of the torsional frequency. It is pointed out that explicit pressure effects on the electric field gradient have to be taken into account to provide an explanation for the observed pressure dependence of ν ( 35 Cl).

Pressure Dependence of Chlorine NQR in Strontium Chlorate and Barium Chlorate Monohydrate