A Neutron Diffraction Study on the Deuteration Effect in CsH_2PO_4 Crystal

概要

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The deuteration rate x of partially deuterated crystals, Cs(H_<1-x>D_x)_2PO_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.
社団法人日本物理学会の論文
1994-11-15