Abstract
The temperature dependence of electric field gradient (EFG) at Rb site in RbH 3 (SeO 3 ) 2 is studied by the second order quadrupole shift. The number of inequivalent Rb sites in the paraelectric and the ferroelectric phases agrees with that deduced from the consideration based on the crystal symmetry. It is found that the change in EFG caused by the phase transition behaved as the order parameter did. The existence of the intermediate incommensurate phase could not be confirmed.
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