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Showing 1 to 4 of 4 for “"bcc helium"”.
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X-ray diffraction study of vacancies in bcc helium-3 and bcc helium-4
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T17:02:41Z No. of bitstreams: 1 1982_granfors.pdf: 4976253 bytes, checksum: e552b132221ed1a25b853f6b916a974f (MD5)
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Energetics of neutral interstitials in germanium
… of the vibrational excitation spectrum of bcc helium-4, which was experimentally observed to contain unexpected optic-like branches. This is explained by the quantum vibrational properties of helium atoms where states with d or 2s symmetry form the optical branches. The second project …
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Thermal vacancies in solid helium-3
… dependence of the x-ray lattice parameter. Bcc He 3 was studied for molar volumes ranging from 20.3 to 24.8 cm ; mole for which the melting temperatures range from 2.36 to 0.435K. It was found to contain about 0.5% thermal vacancies at melting, essentially independent of molar volume. A …
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Thermal vacancies and phase separation in bcc mixtures of helium-3 and helium-4
… of the absolute lattice parameter of the helium crystals with an accuracy of 300 ppm, and measurements of changes in lattice parameter to better than 60 ppm. The phase separation of the concentrated 3He-4He mixtures has been studied in detail with the x-ray measurements. Vacancy …