Abstract
Raman spectra of BaO-SrO-Ga2O3 and MgO-SrO-Ga2O3 glasses have been measured to investigate the structural role of alkaline earth ions in the gallate glasses. From the comparison of the intensities of the pertinent Raman scattering bands it has been found that Mg2+ ions have a structural role different from Sr2+ and Ba2+ ions in the gallate glasses. It has been shown that substitution of MgO for SrO in MgO-SrO-Ga2O3 glasses decreases the concentration of non-bridging oxygens, indicating that Mg2+ ions are favorable neither to make non-bridging oxygens in GaO4 tetrahedra nor to compensate the excess negative charge of GaO4 tetrahedra. It has also been found that substitution of BaO for SrO in SrO-BaO-Ga2O3 glasses changes the glass structure continuously. The significance of the difference in the structural role in gallate glasses between Mg and the other alkaline earth cations such as Ca, Sr and Ba have been related to the different glass-forming tendencies of the alkaline earth gallate systems.
Published Version
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