Chalcogen, Ferroelectric, Oxide, Katiyar, Optical properties

• O-Zn
• Bi-Nd-O-Ti
• Bi-Fe-O
• Fe-Nb-O-Pb
• Fe-O-Pb-Ta
• phonons
• wavenumber of optical phonon
• Raman spectra
• wavenumber of transverse optical phonon
• optical conductivity
• oxide
• ferroelectric
• chalcogen
• transitional
• disordered
• tetragonal
• orthorhombic
• monoclinic
• hexagonal
• trigonal