Abstract
The deuteration rate x of partially deuterated crystals, Cs(H 1- x D x ) 2 PO 4 , was determined through the neutron diffraction experiment. It was found that two non-equivalent positions of hydrogen atoms take slightly different deuteration rates. The deuteration rate x 1 of the shorter hydrogen bond which is closely related to the ferroelectric phase transition is smaller than the rate x 2 of the longer one. The observed dependence of the phase transition temperature T c on x 1 is found to be linear in contrast to the concaved dependence predicted in the one-dimensional proton-pseudospin coupled model. The neutron diffraction experiment also revealed that the distance of the shorter hydrogen bond increased linearly with x 1 , whereas that of the longer one remained constant.
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