Abstract
The temperature dependences of the NMR spectrum and the spin-lattice relaxation times in <TEX>$KH_2PO_4$</TEX> were investigated via single-crystal NMR and MAS NMR. The stretched-exponential relaxation that occurred because of the distribution of correlation times was indicative of the degree of the distribution of the double-well potential on the hydrogen bond. The behaviors responsible for the strong temperature dependences of the <TEX>$^1H$</TEX> and <TEX>$^{31}P$</TEX> spin-lattice relaxation times in the rotating frame <TEX>$T_{1{\rho}}$</TEX> in <TEX>$KH_2PO_4$</TEX> are likely related to the reorientational motion of the hydrogen-bond geometry and the <TEX>$PO_4$</TEX> tetrahedral distortion.
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