Brillouin scattering study of binary potassium germanate glasses

The glass samples were prepared in the series xK 2O–(100 − x)GeO 2 with 0 < x < 27.0, where x denotes the K 2O mol%, by the solution method with high homogeneity. Brillouin spectroscopy has been performed for potassium germanate glasses with increasing alkali contents. The sound velocities and...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2010, Vol.173 (1), p.155-157
Main Authors: Mamiya, Seiichi, Matsuda, Yu, Kaneda, Kazuhiro, Kawashima, Mitsuru, Kojima, Seiji
Format: Article
Language:English
Subjects:
Brillouin scattering
Brillouin zone
Debye temperature
Elastic moduli
Elastic scattering
Germanate anomaly
Germanates
Glass
Homogeneity
Modulus of elasticity
Potassium
Potassium germanate glasses
Sound velocity
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Summary:The glass samples were prepared in the series xK 2O–(100 − x)GeO 2 with 0 < x < 27.0, where x denotes the K 2O mol%, by the solution method with high homogeneity. Brillouin spectroscopy has been performed for potassium germanate glasses with increasing alkali contents. The sound velocities and the elastic moduli were measured by Brillouin scattering in 90 A scattering geometry. Acoustic velocities for both longitudinal and transverse wave, Debye velocity, elastic moduli and Debye temperatures have been determined with all K 2O mol% contents. Each property shows its maximum at about 15 mol% K 2O content. This indicates that about 15 mol% K 2O content provides the maximum sound velocity. It has been found that the glass transition temperatures are related to the Debye temperatures.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2010.03.001