Abstract
A ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$ (KDP) crystal, irradiated by a $1\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ hydrogen ion beam to a dose of ${10}^{15}\phantom{\rule{0.3em}{0ex}}\mathrm{ions}∕{\mathrm{cm}}^{2}$, was studied by means of x-ray diffraction (XRD), $^{1}\mathrm{H}$ nuclear magnetic resonance (NMR), and dielectric constant measurements. The XRD pattern for the $a$-cut KDP crystal revealed a decrease in the lattice constant along the $a$ axis after the proton irradiation. According to the $^{1}\mathrm{H}$ NMR spin-lattice relaxation rate measurements, the proton irradiation gave rise to reduction in the activation energy in the paraelectric phase, from 0.42 to $0.28\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, in agreement with the temperature dependent second moment measurements indicating the proton motion is more activated after the proton irradiation. Besides, analysis of the temperature-dependent dielectric constants using a mean-field approximation revealed a change in the hydrogen bond induced by the proton irradiation.
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