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- W1985020121 abstract "Cooling and Heating Curves for Water Solutions of Uranyl Nitrate between 0ifmmode^circelsetextdegreefi{} and -70ifmmode^circelsetextdegreefi{} C.---A thermo-junction was placed in 0.5 cc. of a solution of known concentration and galvanometer readings were taken every 10 seconds during the cooling. At about -35ifmmode^circelsetextdegreefi{} a rapid evolution of heat took place accompanied by expansion sufficient to break the glass tube if the solution filled more than the rounded bottom. On heating the solution a corresponding absorption of heat was observed at -20ifmmode^circelsetextdegreefi{}. From the observed temperature changes and the specific heat the amount of heat evolved or absorbed was computed. The results of 67 experiments in which the concentration was varied from 10 to 55 per cent. were plotted and show a sharp maximum at 48.0 per cent. for the evolved heat and at 47.5 per cent. for the absorbed heat.New Compound Discovered by Thermal Analysis, Uranyl Nitrate Icositetrahydrate.---The above results point to the formation at -35ifmmode^circelsetextdegreefi{} of the compound U${mathrm{O}}_{2}$${(mathrm{N}{mathrm{O}}_{3})}_{2}$.24${mathrm{H}}_{2}$O, which has a less density than the hexahydrate and which decomposes spontaneously at -20ifmmode^circelsetextdegreefi{}. This compound is of special interest in connection with the study of the relation between composition and the fluorescence and absorption of the spectra uranyl hydrates." @default.
- W1985020121 created "2016-06-24" @default.
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- W1985020121 date "1922-06-01" @default.
- W1985020121 modified "2023-09-23" @default.
- W1985020121 title "Thermal Analysis at Low Temperatures" @default.
- W1985020121 doi "https://doi.org/10.1103/physrev.19.623" @default.
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