Abstract
We studied the hydrogen-bonded <TEX>$TlH_2PO_4$</TEX> (TDP) ferroelectrics treated with the proton-beam bombardment. The TDP material was irradiated with 1-MeV proton beam at a dose of <TEX>$10^{15}/cm^2$</TEX>. In order to analyze the hydrogen environment in TDP, we carried out the <TEX>$^1H$</TEX> high resolution nuclear magnetic resonance (NMR) - i.e., Combined Rotation And Multiple Pulse Spectroscopy (CRAMPS) measurement. The isotropic chemical shift of hydrogen indicates its displacive property is related to the <TEX>$PO_4$</TEX> lattice deformation which occurs throughout the antiferroelectric-, the ferroelastic- and the paraelastic-phase transitions. The temperature dependence of <TEX>$\sigma_{iso}$</TEX> reveals the electronic charge redistribution is induced by the proton-beam irradiation and the elastic property.
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