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Non-Debye excess heat capacity and boson peak of binary lithium borate glasses

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Title: Non-Debye excess heat capacity and boson peak of binary lithium borate glasses
Authors: Matsuda, Yu1 hiiro_s721@yahoo.co.jp, Kawaji, Hitoshi2, Atake, Tooru2, Yamamura, Yasuhisa1, Yasuzuka, Shuma1, Saito, Kazuya1, Kojima, Seiji1 kojima@bk.tsukuba.ac.jp
Source: Journal of Non-Crystalline Solids. Jan2011, Vol. 357 Issue 2, p534-537. 4p.
Subjects: Bosons, Lithium, Borate crystals, Neutron scattering, Calorimeters, Low temperatures, Vibrational spectra
Abstract: 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 50K 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract: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 50K 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. [ABSTRACT FROM AUTHOR]
ISSN:00223093
DOI:10.1016/j.jnoncrysol.2010.06.066