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Electronic energy gap, Y-x polyhedra
Ba-Cu-O-Y
Ba-Cu-F-O-Y
Ge-Y
O-Y-Zr
Al-O-Y
values of electronic energy gap
energy gap for direct transition
energy gap for indirect transition
thermal energy gap
charge-transfer energy
transitional
rare earth
chalcogen
disordered
orthorhombic
cubic
monoclinic
hexagonal
tetragonal