Permeability and Solubility of He 3 and He 4 in Vitreous Silica 1
โ Scribed by Jones, W. M.
- Book ID
- 126334968
- Publisher
- American Chemical Society
- Year
- 1953
- Tongue
- English
- Weight
- 483 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0002-7863
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๐ SIMILAR VOLUMES
For the ftrst time 'He gas dissolved in solids (pyrex and suprasil glasses) has been studied by NMR. The chemical shifts are mainly determined by interaction with diamagnetic atoms of the glass structure and not by magnetic interaction with Fe'+ ions. In pyrex the relaxation times at 25ยฐC are: T, ('
Helium-3 nuclear spin relaxation times T1, T2, and Tip have been measured for 3He-4He solid mixtures at the exchange plateau region (~ O. 5 K). The 3He concentrations x3 of the samples were 7.2, 2.9, 1.8, 1.4, 0.67, 0.65, and 0.22 %, and their molar volumes varied between 19.9 and 20.9 cm3 /mole in
As a continuation of our previous experiments (l), the phase separation temperatures of dilute solution of 4He in liquid 3He have been measured with increased surface area in the cell, in order to estimate the amount of 4He adsorbed on the surface. The solubility of 4He below 200 mK is larger than t