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Raman studies of lattice vibrations in Rb4LiH3(SO4)4 and K4LiH3(SO4)4 single crystals

The Raman scattering technique was used to study lattice vibrations in single crystals of K4LiH3(SO4)4 from 100 to 295 K covering their 4 to 2 structural phase transitions. All of the Raman modes of K4LiH3(SO4)4 were found not to be affected by the transition. In the case of Rb4LiH3(SO4)4, a slight softening of the B mode (at 31 cm-1) was observed in the paraelastic phase.