The Uranium-Nitrogen System
1967 年 4 巻 6 号 p. 283-288
詳細
1967 年 4 巻 6 号 p. 283-288
The purpose of the persent work is to evaluate the heat of formation of uranium sesquinitride, U2N3. The U2N3 phase is known to form a single solid solution with UN2, while the U2N3 compound with minimum N/U ratio is in equilibrium mith UN under a given condition of temperature. The heat of formation for the terminal U2N3 has been calculated from measured pressure of decomposition from U2N3 to UN, by Gross, et al., Lapat, et al. and Bauer, et al. In the present work, the decomposition pressure was measured by a simple Sievert apparatus with an oil manometer. From the nitrogen pressure-composition-isotherms obtained by Lapat, et al., the interaction energies for U-U, U-N and N-N were calculated statistico-thermodynamically. Using these values, the heat of formation for the single phase U2N3 was determined to be
ΔH0(U2N3+x)=-172.2-48.9x+25.4x2kcal/mol.
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