Abstract
We have investigated the hydrogen ion beam irradiation effect on $\mathrm{Tl}{\mathrm{H}}_{2}\mathrm{P}{\mathrm{O}}_{4}$ (TDP) showing an antiferroelectric phase transition and a ferroelastic phase transition. The polycrystalline sample was irradiated by $1\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ hydrogen ion beams to a dose of ${10}^{15}\phantom{\rule{0.3em}{0ex}}\text{ions}∕{\mathrm{cm}}^{2}$. The x-ray diffraction pattern shows a lattice elongation along the hydrogen bond direction. According to $^{1}\mathrm{H}$ rotating frame nuclear magnetic resonance measurements, the activation energy increased above the antiferroelectric phase transition after proton beam irradiation from $0.41\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}0.57\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, indicative of hampered proton motions. The temperature-dependent $^{31}\mathrm{P}$ high resolution nuclear magnetic resonance isotropic chemical shift indicated a displacive change in the $\mathrm{P}{\mathrm{O}}_{4}$ tetrahedra, and the linewidth showed a broadening after the proton irradiation.
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