Khramov

• Ca-Mn-O-V
• Ca-Co-O-V
• O-Si
• O-Pr-Yb-Zr
• H-Ni-O-S
• structural properties
• phonons
• Raman spectra
• optical properties
• phase transitions
• chalcogen
• transitional
• disordered
• nonmetal
• tetragonal
• trigonal
• monoclinic
• cubic
• hexagonal