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Ba-Eu, Electronic energy gap
Ba-Eu-N-O-Si
Ba-Eu-Nb-O
Ba-Cl-Eu
Ba-Cu-Eu-O
Ba-Eu-Fe-O
values of electronic energy gap
energy gap for direct transition
energy gap for indirect transition
rare earth
alkaline
lanthanoid
chalcogen
orthorhombic
tetragonal
cubic
trigonal
monoclinic