New insights into the structure of alkali borate glasses
نویسندگان
چکیده
منابع مشابه
Mechanical Properties of Alkali Borate Glasses
A GLASS is, formally, a solid that solidifies without a well-defined melting point— defined as a singular temperature at which there occurs a discontinuous change in a physical property, for example specific volume, during transition between a liquid state and its corresponding solid state—but instead exhibits a continuous change in that property over a range of temperature. Glasses tend to inh...
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In this paper we re-examine the alkali dependence of the fraction of four-coordinated borons (N4) in two series of glasses: alkali borates (0·4M2O.B2O3) and mixed lithium caesium borates (0·4(xLi2O+(1-x)Cs2O). B2O3). High field B MAS-NMR experiments were performed to maximise the accuracy of the present results. We found no evidence for an alkali dependence on N4 in either system. In each case ...
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Since the discovery of fast ionic conductivity in glasses, there has been a large interest in explaining the diffusion mechanism. With this knowledge one may be able to design new glasses with optimized properties for various applications. It is well known that the ionic conductivity increases rapidly when a network glassformer is modified by the addition of a metal alkali. Despite considerable...
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High sensitivity dielectric constant and heat capacity measurements are reported for solid N2–Ar mixtures as well as pure N2 in the presence of a small external ac electric field in the audio frequency range. Unexpected fieldinduced aging and memory effects are observed for thermal cycles of field cooled samples, above a well-defined temperature Th. The magnitude and temperature dependences of ...
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ژورنال
عنوان ژورنال: Journal of Non-Crystalline Solids
سال: 1990
ISSN: 0022-3093
DOI: 10.1016/0022-3093(90)90796-o