Issues »  Volume 40, Issue 11

Longitudinal Ultrasound Velocity and Attenuation in Isotopically Enriched Cadmium

A. S. Bulatov, G. P. Kovtun, V. S. Klochko, A. V. Korniets, D. A. Solopikhin, A. P. Shcherban’

National Science Center ‘Kharkiv Institute of Physics and Technology’, NAS of Ukraine, 1 Akademichna Str., UA-61108 Kharkiv, Ukraine

Received: 04.05.2018. Download: PDF

The results of the acoustic-properties’ study of high-purity (>99.999%) cadmium enriched to 66.4% with the isotope $^{106}$Cd and to 82.2% with the isotope $^{116}$Cd are presented for the temperature range of 77–300 K. Isotopic effects are observed in the temperature dependence of the 50 MHz ultrasound propagation velocity and attenuation. A comparison of the sound velocity data for the $^{106}$Cd and $^{116}$Cd samples has revealed a first-order isotopic effect with a characteristic linear dependence on the isotopes’ masses difference, and it determines the phonon-spectrum change caused by the isotope composition. Measuring the attenuation of the longitudinal ultrasound made it possible to detect a second-order isotopic effect with a quadratic dependence on the isotopes’ masses difference. The quadratic effect is due to a disordered isotope distribution, and it causes an additional relaxation mechanism for phonon scattering.

Key words: natural cadmium, $^{106}$Cd and $^{116}$Cd isotopes, isotopic disorder, velocity and attenuation of longitudinal ultrasound.

URL: http://mfint.imp.kiev.ua/en/abstract/v40/i11/1465.html

DOI: https://doi.org/10.15407/mfint.40.11.1465

PACS: 28.60.+s, 31.30.Gs, 32.10.Bi, 43.35.-c, 43.35.+d, 62.65.+k, 63.20.-e

Citation: A. S. Bulatov, G. P. Kovtun, V. S. Klochko, A. V. Korniets, D. A. Solopikhin, and A. P. Shcherban’, Longitudinal Ultrasound Velocity and Attenuation in Isotopically Enriched Cadmium, Metallofiz. Noveishie Tekhnol., 40, No. 11: 1465—1473 (2018)

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