Thermal expansion measurement and heat capacity evaluation of hypo-stoichiometric PuO $_{2.00}$

Kato, Masato ; Uchida, Teppei; Matsumoto, Taku; Sunaoshi, Takeo*; Nakamura, Hiroki ; Machida, Masahiko

Linear thermal expansion of PuO $_{2-x}$ was measured by dilatometry in an oxygen partial pressure-controlled atmosphere. The measured data of PuO $_{2-x}$ slightly increased with deviation . The linear thermal expansion of PuO $_{2-x}$ was determined as a function of temperature and O/M ratio, and the equation for the thermal expansion coefficient was derived. Heat capacity of PuO $_{2-x}$ was evaluated using this equation. The effect of O/M ratio on heat capacity was small. In addition to the vibration and dilatational terms, it is important to analyze the Schottky term in evaluating heat capacity of PuO $_{2}$ .

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	451
Number	:	1-3
Pages	:	p.78 - 81
Publication Year/Month	:	2014/08
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2014.03.021
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Keywords	:	no keyword
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Registration No. : AA20130717
JAEA Abstracts No. : 42000872
Paper Submission No. : 14529

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