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Solidus and liquidus temperatures in the UO$$_{2}$$-PuO$$_{2}$$ system

UO$$_{2}$$-PuO$$_{2}$$系の固相線及び液相線

加藤 正人; 森本 恭一; 菅田 博正*; 小無 健司*; 鹿志村 元明; 安部 智之

Kato, Masato; Morimoto, Kyoichi; Sugata, Hiromasa*; Konashi, Kenji*; Kashimura, Motoaki; Abe, Tomoyuki

30%以上のプルトニウムを含むMOXについてタングステンカプセルとレニウムカプセルを用いた融点測定を行った。従来から行われているタングステンカプセルによる測定では、MOXの融点測定中にタングステンとプルトニウム酸化物の液相が現れ融点測定に影響することを見いだした。その反応を避けるためにレニウムカプセルを用いた測定を行った。レニウムカプセルにより得られた融点を用いてUO$$_{2}$$-PuO$$_{2}$$系の融点を決定した。UO$$_{2}$$-PuO$$_{2}$$-AmO$$_{2}$$ 3元系を理想溶液モデルと仮定し、固相線温度液相線温度を$$sigma$$=$$pm$$9K and $$sigma$$=$$pm$$16Kの精度で表すことができた。

The melting of plutonium and uranium mixed oxide (MOX) containing Pu of more than 30% was investigated using a tungsten capsule and a rhenium inner capsule. In the conventional measurement of MOX in the tungsten capsule, a liquid phase of tungsten and plutonium oxide appeared in the MOX during melting. This liquid phase was found to have an effect on the measurement of melting point. Therefore the rhenium inner capsule was used to avoid the effect. The solidus and liquidus temperatures in the UO$$_{2}$$-PuO$$_{2}$$ system were decided from the MOX data measured using the rhenium capsule, and the effect of the Am content on the solidus temperature was evaluated. The variation of the solidus and liquidus temperatures in the UO$$_{2}$$-PuO$$_{2}$$-AmO$$_{2}$$ ternary system was represented to an accuracy of $$sigma$$=$$pm$$9K and $$sigma$$=$$pm$$16K, respectively, by the ideal solution model.

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パーセンタイル:4.44

分野:Materials Science, Multidisciplinary

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