Non-Debye excess heat capacity and boson peak of binary lithium borate glasses |
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Authors: | Yu Matsuda Hitoshi Kawaji Yasuhisa Yamamura Kazuya Saito |
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Institution: | a Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japanb Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan |
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Abstract: | The non-Debye excess heat capacities of binary lithium borate glasses with different Li2O compositions of x = 8, 14 and 22 (mol%) are investigated to understand origin of the boson peak. The low-temperature heat capacities are measured between 2 and 50 K by a relaxation calorimeter. The experimental non-Debye heat capacities with x = 14 is successfully reproduced using the excess vibrational density of states measured by inelastic neutron scattering. This finding indicates that the non-Debye heat capacities of lithium borate glasses originate from the excess vibrational density of states measureable by inelastic neutron scattering. Moreover, it is demonstrated that all of the excess heat capacity spectra lie on a single master curve by the scaling using boson peak temperature and intensity. |
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Keywords: | Alkali borate glasses Low-temperature heat capacities Specific heat Boson peak Low-energy excitation Vibrational density of states Relaxation calorimetry Non-Debye |
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