Chalcogen, Electronic energy gap, Pr-S

• O-Pr-S
• H-N-O-Pr-S
• H-O-Pr-S
• Cs-Pr-S
• values of electronic energy gap
• energy gap for indirect transition
• thermal energy gap
• energy gap for direct transition
• rare earth
• chalcogen
• lanthanoid
• sulfide
• monoclinic
• hexagonal
• orthorhombic
• tetragonal
• cubic