O-Ti, Optics, Tetragonal, Transitional

• Ba-O-Ti
• O-Pb-Ti
• O-Pb-Ti-Zr
• Co-O-Ti
• phonons
• Raman spectra
• optical spectra
• wavenumber of optical phonon
• optical absorption
• transitional
• chalcogen
• oxide
• disordered
• nonmetal