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首页> 外文期刊>Journal of thermal analysis and calorimetry >Low-temperature heat capacity of alkali metal borate glass
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Low-temperature heat capacity of alkali metal borate glass

机译：Low-temperature heat capacity of alkali metal borate glass

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As a universal feature of glass, its low-energy inelastic scattering spectra show a broad response known as the boson peak (BP). Since the BP is the peak of g(E)/E-2, in which g(E) is the vibrational density of states (VDoS), it originates from the low-energy excess of VDoS over the Debye prediction. As another feature of the BP, namely, the excess part of the heat capacity, C-p, at low temperatures shows a broad peak in the C-p/T-3 versus T plot, which is higher than the Debye level, and is also related to the excess VDoS. The heat capacity of rapidly quenched alkali metal borate glass, i.e., xM(2)O (1-x)B2O3 of x=0.22 and M=Na, K, Rb, and Cs, was measured between 2 and 150K. Upon increasing the alkali cation size, the peak temperature of C-p/T-3 decreases, while the peak value of C-p/T-3 increases. The peak temperature of C-p/T-3 shows a good correlation with the shear modulus. This correlation can be related to the variation of the contraction of boron-oxygen network as the alkali charge density increases with the decrease in the alkali cation size. The composition dependence of C-p/T-3 was also studied for a cesium borate glass. The universal nature of C-p/T-3 curves among alkali borate glass indicates that the distribution of the low-energy excess VDoS does not depend on the alkali metal and its content below x=0.22.

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