Frequency spectrum of tantalum at temperatures of 293–2300 K |
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Authors: | V A Semenov Zh A Kozlov L Krachun G Mateescu V M Morozov A I Oprea K Oprea and A V Puchkov |
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Institution: | 1.State Scientific Center of the Russian Federation,Leypunsky Institute for Physics and Power Engineering,Obninsk, Kaluzhskaya oblast,Russia;2.Joint Institute for Nuclear Research,Dubna, Moscow oblast,Russia;3.Horia Holubei National Institute of Physics and Nuclear Engineering,Bucharest-Magurele,Roumania |
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Abstract: | The temperature dependence of the frequency spectrum of tantalum in the temperature range from room temperature to 2300 K
has been studied for the first time using inelastic slow-neutron scattering. The inelastic slow-neutron scattering spectra
have been measured at different temperatures on a DIN-2PI time-of-flight spectrometer installed at the IBR-2 nuclear reactor
(Joint Institute for Nuclear Research, Dubna, Russia) with the use of a TS3000K high-temperature thermostat. From the measured
spectra, the frequency spectra of the tantalum crystal lattice have been determined at temperatures of 293, 1584, and 2300
K by the iteration method. As the temperature increases, the frequency spectrum, on the whole, is softened and the specific
features manifested themselves at room temperature are smoothed. The variations observed have been explained by the increase
in the role of the effects of vibration anharmonism at high temperatures. |
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