Add time:07/26/2019         Source:sciencedirect.com

Sodium and potassium germanate glasses and their corresponding crystals are investigated by X-ray diffraction, Raman spectroscopy, and Fourier transforms infrared spectroscopy. Highly coordinated species of Ge are found in germanate glass. In the K2O-GeO2 glass system, three Ge structural units (4-, 5-, and 6-fold) coexist in the glass structure when the content of K2O ranges between 11 and 20 mol%, while only two Ge species (4- and 6-fold) are left with a further increase of K2O content. It is interesting to note that K2O·8GeO2 crystal, which is prepared by the solid state sintering method or crystallized from potassium germanate glass (K2O < 20 mol%), is a congruent melting compound in the K2O-GeO2 phase diagram. Furthermore, the density and refractive index of sodium and potassium germanate glasses are predicted, and a reasonable explanation of abnormal germanium is proposed according to the phase diagram approach. The results might provide new insight into the mechanism of germanate anomaly.

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