Chalcogen, Disordered, Katiyar, Optical properties

• Fe-Nb-O-Pb
• O-Zn
• Co-O-Zn
• Bi-Nd-O-Ti
• Be-Mg-O-Zn
• phonons
• wavenumber of optical phonon
• Raman spectra
• optical absorption
• wavenumber of transverse optical phonon
• disordered
• oxide
• chalcogen
• transitional
• ferroelectric
• hexagonal
• tetragonal
• cubic
• orthorhombic
• monoclinic