Heat capacity and lattice dynamics of yttrium diboride in the temperature range 5–300 K |
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Authors: | V V Novikov A V Matovnikov T A Chukina A A Sidorov E A Kul’chenkov |
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Institution: | (1) Petrovskiĭ Bryansk State University, Bryansk, 241036, Russia |
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Abstract: | This paper reports an experimental study of the heat capacity and crystal lattice parameters of a polycrystalline sample of yttrium diboride prepared by high-temperature synthesis from elements. The electronic and lattice contributions to the heat capacity are isolated. The temperature dependences of the characteristic temperature, the linear thermal expansion coefficients αa(T) and α c (T), the bulk thermal expansion coefficient β(T), and the Grüneisen coefficient are calculated. A region of negative values of α c (T) and β(T) is revealed. Anharmonicity is found to exert only a minor effect on the YB2 lattice dynamics over a larger part of the temperature range covered. |
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