Journal of the Physical Society of Japan · 1981 · 50 citations · 2 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMaterials PhysicsSolid State PhysicsCrystal ChemistryCrystal SymmetryElectronic Band StructureFerroelectric MaterialsPhase TransitionsRaman SpectroscopyFerroelectric CrystalsFerroelectric Phase TransitionsFerroelectric PropertiesFerroelectricityPhase Transition TemperaturePolarizationSpontaneous Polarization
It has been found that Li 2 Ge 7 O 15 crystal shows ferroelectric activity in the c direction below T c =283.5 K. The spontaneous polarization is about 0.02 µC/cm 2 at 276 K. By means of Raman scattering technique a totally symmetric soft mode, whose frequency becomes zero as the phase transition point is approached from below, has been found in the α c c spectra.
2
Raman Scattering Spectra of SC(NH<sub>2</sub>)<sub>2</sub>
Mitsuo Wada, Akikatsu Sawada, Yoshihiro Ishibashi et al. · Journal of the Physical Society of Japan · 1978 · 32 citations
Natural Sciences, Chemistry, Physics +15