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Alkali, Electronic energy gap, K-Nb
K-Nb-O
K-Na-Nb-O
F-K-Nb-O
K-Li-Nb-O
K-Nb-O-Ti
values of electronic energy gap
energy gap for indirect transition
energy gap for direct transition
transitional
alkali
chalcogen
oxide
orthorhombic
tetragonal
monoclinic
cubic
hexagonal