Garcia revilla

• Er-K-O-W-Y-Yb
• Br-Cd-Cs-Eu
• Al-O-Ti
• Ca-F-Mn-Sr
• Ca-F-Mn
• electronic and electrical properties
• optical properties
• crystal field level
• crystal electric field
• values of luminescence
• transitional
• nonmetal
• lanthanoid
• rare earth
• alkali
• monoclinic
• cubic
• hexagonal
• trigonal