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Akatsuka
Ca-K-Nb-O
Ca-K-Na-Nb-O
Na-Nb-O
Ca-Na-Nb-O
Eu-K-O-Ta
structural properties
optical properties
optical spectra
extended X-ray absorption fine structure
alkali
transitional
rare earth
lanthanoid
chalcogen
hexagonal
monoclinic
triclinic
orthorhombic