Abstract: Infrared reflectance and Raman spectra of rubidium germanate glasses, xRb2O·(1 − x)GeO2, have been measured and studied as a function of Rb2O mole fraction in the range 0 ≤x ≤ 0.60. The spectra of corresponding crystalline germanate phases, GeO2-quartz, GeO2-rutile, Rb2Ge4O9, K4Ge9O20, K2Ge2O5, and K2GeO3, have been also measured for a better understanding of the glass spectra. At very low content (x ≤ 0.01) Rb2O was found to induce a redistribution of GeO4 tetrahedra in rings smaller than those encountered in quartz- and glassy GeO2. ...
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Topics: 
Crystallography