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Report No.
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Synthesis of neptunium trichloride and measurements of its melting temperature

Hayashi, Hirokazu ; Takano, Masahide ; Kurata, Masaki ; Minato, Kazuo 

Neptunium trichloride of high purity was synthesized by the solid-state reaction of neptunium nitride, which was prepared from the oxide by the carbothermic reduction method, and cadmium chloride in a similar manner as reported for synthesis of AmCl$$_3$$. Lattice parameters of hexagonal NpCl$$_3$$ were determined from the X-ray diffraction pattern to be a = 0.7421 $$pm$$ 0.0006 nm and c = 0.4268 $$pm$$ 0.0003 nm, which fairly agree with the reported values (a = 0.742 $$pm$$ 0.001 nm and c = 0.4281 $$pm$$ 0.0005 nm). Melting temperature of NpCl$$_3$$ was measured with about 1 mg of the sample which was hermetically encapsulated in a gold crucible using a differential thermal analyzer with heating and cooling rate of 10 K/min in an argon gas flow (50 mL/min). The melting temperature of NpCl$$_3$$ was determined to 1070 $$pm$$ 3 K, which is close to the recommended value 1075$$pm$$30 K, which was derived from the mean value of the melting temperature for UCl$$_3$$(1115K) and that for PuCl$$_3$$ (1041 K).

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Category:Materials Science, Multidisciplinary

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