Rico

• Er-Gd-K-O-W
• Gd-Na-O-W
• Nb-O-P-Rb-Ti
• Gd-Na-O-W-Yb
• O-P-Rb-Ti
• optical properties
• electronic and electrical properties
• crystal electric field
• crystal electric field parameter
• luminescence
• alkali
• transitional
• chalcogen
• nonmetal
• rare earth
• tetragonal
• monoclinic
• orthorhombic