Chalcogen, Metal, Transitional, Energy band structure, Trigonal

• Se-Ti
• Ir-Te
• S-Ti
• La-Ni-O
• Se-V
• electron energy band structure
• Fermi surface
• Fermi energy
• Brillouin zone
• energy at Fermi level
• metal
• chalcogen
• transitional
• non-disordered
• disordered