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Syntheses and thermal analyses of curium trichloride

キュリウム三塩化物の調製と熱分析

林 博和; 高野 公秀; 音部 治幹; 小山 正史*

Hayashi, Hirokazu; Takano, Masahide; Otobe, Haruyoshi; Koyama, Tadafumi*

窒化キュリウムと塩化カドミウムを真空中で748K以下で加熱し、三塩化キュリウム試料を固体反応によって調製した。調製した六方晶$$^{244}$$CmCl$$_3$$の格子定数はa=0.7385$$pm$$0.0005nm、c= 0.4201$$pm$$0.0005nm、示差熱分析法によって測定した融解温度は970$$pm$$3Kであり、これらの物性値は、既報告値とよく一致した。分離精製したキュリウム酸化物試料を原料としてmgスケールのCmCl$$_3$$試料を腐食性の試薬を使用せずに調製できることを示した。

Curium trichloride was synthesized by the solid state reaction of curium nitride with cadmium chloride heated from room temperature to 748K in a dynamic vacuum. The product was hexagonal $$^{244}$$CmCl$$_3$$, of which lattice parameters were determined to be a= 0.7385$$pm$$0.0005 and c= 0.4201$$pm$$0.0005 nm. The melting temperature of the $$^{244}$$CmCl$$_3$$ sample was determined to be 970$$pm$$3 K by differential thermal analyses using a gold crucible. These values are close to those reported in literatures. The results show that mg-scale CmCl$$_3$$ samples for thermochemical measurements were prepared from the purified oxide sample without the use of corrosive reagents.

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