Abstract
The elastic properties of potassium borate glass, xK2O·(100 - x)B2O3, where x is the molar composition of K2O in mol %, have been investigated by Brillouin scattering spectroscopy over a wide composition range of 2 ≤x ≤42 mol %. From the observed values of longitudinal sound velocity, the elastic constant has been determined and compared with that of lithium borate glass. The sound velocity increases with increasing x below x = 30; however, for a further increase in x, it decreases owing to the softening caused by the formation and increase in the number of nonbridging oxygen atoms. The absorption coefficient also increases markedly above x = 30 owing to the scattering of acoustic waves by nonbridging oxygen atoms. The temperature dependences of both sound velocity and absorption coefficient of 14K2O·86B2O3 show a markedly change at approximately the glass transition temperature Tg of 395 °C.
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