Khramov

• Ca-Mn-O-V
• Ca-Co-O-V
• O-Si
• Ca-O-V
• Bi-Dy-Ge-O
• structural properties
• optical properties
• phonons
• Raman spectra
• phase transitions
• chalcogen
• disordered
• transitional
• nonmetal
• trigonal
• tetragonal
• monoclinic
• cubic
• hexagonal