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Showing 1 to 3 of 3 for “"hcp helium"”.
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Thermal vacancies in HCP helium-4
… of thermal vacancies have been determined in hcp $\sp4$He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm$\sp3$/mole. Absolute lattice parameters at low temperatures were …
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Thermal vacancies in hcp helium-4
… of thermal vacancies have been determined in hcp 4He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm3/mole. Absolute lattice parameters at low temperatures were measured for many …
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Vacancies in low-density hcp helium-4 solids
… and thermally-activated excitations in helium solids have been extensively examined by a variety of experimental and theoretical studies. Although these excitations are typically identified as vacancies, large discrepancies arise in exactly what their nature and role are in the …