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CaF$$_{2}$$の熱膨張率及び比熱の測定

Measurement of thermal expansion and specific heat of CaF$$_{2}$$

土持 亮太; 加藤 正人   ; 廣岡 瞬 ; 松本 卓; 宇野 弘樹*; 小笠原 誠洋*; 菅田 博正*

Tsuchimochi, Ryota; Kato, Masato; Hirooka, Shun; Matsumoto, Taku; Uno, Hiroki*; Ogasawara, Masahiro*; Sugata, Hiromasa*

アクチニド酸化物と同様の結晶構造をとるCaF$$_{2}$$について、高温X線回折装置及び示差走査熱量計を用いて、熱膨張率及び比熱の測定を行った。CaF$$_{2}$$の比熱は定積比熱、熱膨張項に加えて500K以上の温度領域で励起される比熱を観察した。本報告では、これらの比熱の解析結果を実験データと合わせて報告する。

Thermal expansion and specific heat of CaF$$_{2}$$, which forms the same crystal structure as actinide oxides, were measured by using high-temperature X-ray diffractmeter and differential scanning calorimetry. We confirmed that the specific heat of CaF$$_{2}$$ explicitly shows the effect of excitation on top of the heat capacity at constant volume and dilatational term. The analysis of the specific heat will be discussed together with the measured data.

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