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Electronic energy gap, Nb-x polyhedra
Li-Nb-O
K-Nb-O
Nb-O
Na-Nb-O
Ba-Nb-O
values of electronic energy gap
energy gap for indirect transition
energy gap for direct transition
thermal energy gap
transitional
chalcogen
oxide
disordered
orthorhombic
cubic
monoclinic
tetragonal
trigonal