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Cell and atoms, Electronic energy gap, Tetrahedron 4-vertex
C-H-N-O
O-Si
Al-H-Na-O-Si
H-N-O-P
H-Na-O-P
values of electronic energy gap
energy gap for direct transition
energy gap for indirect transition
chalcogen
non-disordered
transitional
pnictogen
monoclinic
orthorhombic
triclinic
cubic
tetragonal