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- W2046408573 abstract "Abstract Studies on deuterium are made difficult by the unavoidable presence of hydrogen deuteride (HD) as an impurity, which alters the thermodynamic properties of the pure substance, and by the difficulty in predicting the exact amount of this impurity during the measurements, as it tends to increase continuously during handling. The paper deals with the physicochemical problems involved in ensuring a controlled purity level of deuterium better than 99.99 moles per cent during the experiments, and the techniques which have been developed to preserve this gas purity, especially when a catalyst must be added to ensure spin equilibrium at low temperatures. Purity control within 99.99 moles per cent has been found essential to obtain a reproducibility of the triple-point temperature within ± 0.2 mK and an accuracy of ± 0.3 mK. The resulting temperatures on IPTS-68 for the pure substance have been found to be 18.7327 K for n -D 2 and 18.6983 K for e -D 2 . The thermodynamic values are 9.5 mK lower. When literature values are corrected for the actual HD content, the revised molar enthalpy change on melting is (198.7 ± 0.6) J · mol −1 ." @default.
- W2046408573 created "2016-06-24" @default.
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- W2046408573 date "1988-03-01" @default.
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- W2046408573 title "Physicochemical problems involved in measuring thermodynamic properties of normal and equilibrium deuterium at the triple point" @default.
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- W2046408573 doi "https://doi.org/10.1016/0021-9614(88)90131-0" @default.
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