Abstract
Abstract The IR and polarized Raman spectra of a single crystal K3H(SeO4)2 is recorded and analyzed. A temperature dependent Raman spectra of the protonated crystal in the 300–410 K is also reported. The Se—O bond strength is found to be stronger in K3H(SeO4)2 than that observed in the isomorphous Rb3H(SeO4)2 crystal. The presence of vSe—O and vSe—OH bands agrees with a non-centrosymmetric dimer in K3H(SeO4)2. The appearance of transmission window along with the trio bands (ABC) in the vOH region confirms strong hydrogen bonding. The positive isotope effect indicates a weakening of the H-bond on deuteration. The intensity enhancement of the symmetric stretching bands and less number of bands observed in the trigonal phase confirm a first order improper ferroelastic phase transition at 390 K. The shifting of the lattice mode from 125 cm−1 to 108 cm−1 around Tc . could be a soft mode associated with structural order parameter in the crystal.
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