Vibrational spectra and phase transitions in ferroelectric-ferroelastic langbeinites: K2Mn2(SO4)3, (NH4)2Cd2(SO4)3 and Tl2Cd2(SO4)3
作者： S Kreske , V Devarajan
DOI: 10.1088/0022-3719/15/36/015
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摘要: Complete vibrational spectra (Raman, infrared and far-infrared) have been recorded for the ferroelastic, ferroelectric langbeinites, K2Mn2(SO4)3, (NH4)2Cd2(SO4)3 Tl2Cd2(SO4)3. From polarised single-crystal Raman modes, corresponding to 'internal' vibrations of SO42-ion, were identified assigned various symmetry species para phase factor group T all crystals. Single-crystal at temperatures (down liquid nitrogen temperature) study transitions. No soft modes could be observed near On other hand abrupt changes in slopes full width half maximum (FWHM) versus temperature peak height curves, Raman-active SO4 vibrations, seen This indicates strongly probability an order-disorder transition mechanism involving SO42- ions. Further cell doubling due antiferrodistortive phases (P21 P1) Tl2Cd2(SO4)3, which should associated with line splittings, not observed.
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