The Uranium-Nitrogen System

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概要

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• The purpose of the persent work is to evaluate the heat of formation of uranium sesquinitride, U<SUB>2</SUB>N<SUB>3</SUB>. The U2N3 phase is known to form a single solid solution with UN<SUB>2</SUB>, 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 U<SUB>2</SUB>N<SUB>3</SUB> has been calculated from measured pressure of decomposition from U<SUB>2</SUB>N<SUB>3</SUB> 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 U<SUB>2</SUB>N<SUB>3</SUB> was determined to be<BR>ΔH<SUP>0</SUP>(U<SUB>2</SUB>N<SUB>3+x</SUB>)=-172.2-48.9x+25.4x<SUP>2</SUP>kcal/mol.

• 一般社団法人 日本原子力学会の論文

著者

• Katsura Masahiro

  Department Of Nuclear Engineering Osaka University

• SANO Tadao

  Department of Nuclear Engineering, College of Engineering, Osaka University

• KATSURA Masahiro

  Department of Nuclear Engineering, College of Engineering, Osaka University

関連論文

• Magnetocaloric Effect of Super-paramagnetic Nanocomposite Composed of Iron-Oxide and Silver
• Formation of Iron-Nitride/Silver Nanocomposites by Ammonia-Flow Method and Nitride Phase Identification by X-Ray Absorption Near-Edge Structure
• Enhancement of Hydrogen Evolution Yield from Water Dispersing Nanoparticles Irradiated with Gamma-Ray
• Change of Composition of UC1-xNx in Nitrogen Gas
• The Uranium-Carbon-Nitrogen System
• The Uranium-Nitrogen System

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