Title

Crystal growth, structures, magnetic and photoluminescent properties of NaLnGeO4 (Ln = Sm, Eu, Gd, Tb)

Document Type

Article

Subject Area(s)

Chemistry

Abstract

Single crystals of NaLnGeO4 (Ln = Sm, Eu, Gd) were grown out of a moltensodium hydroxide flux, and their crystal structures were determined by single crystal X-ray diffraction. The lanthanide containing germanates crystallize in the orthorhombic space group of Pnma, and exhibit a complex three-dimensional structure consisting of corner- or edge-shared LnO6, GeO4, and NaO6polyhedra. UV–vis diffuse reflectance spectra indicated that the reported oxides are insulating materials with wide band gaps. The magnetic susceptibility data shows paramagnetic behavior. For the NaEuGeO4 and NaTbGeO4compositions intense room temperature photoluminescence was observed.

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