Oxygen potentials of PuO<sub>2-x</sub>

Komeno, Akira; Kato, Masato; Hirooka, Shun; Sunaoshi, Takeo

doi:10.1557/opl.2012.1162

Cited by 11 publications

(23 citation statements)

References 14 publications

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“…The thermo gravimeter (Bruker AXS TG-DTA 2000SA) is able to measure the weight change of ±10 μg which corresponds to the O/M change of ±0.0005. Details of the apparatus were reported previously [2]. The specimen was heated to the measurement temperature in Ar gas flow.…”

Section: Apparatus and Measurement Techniquementioning

confidence: 99%

“…Stoichiometry significantly affects physical properties such as lattice parameters, oxygen potentials and melting temperatures [1][2][3][4]. Therefore, it is important to understand the characterictics of the defects in the non-stoichiometric composition for evaluation of the physical property change of PuO 2-x .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is important to understand the characterictics of the defects in the non-stoichiometric composition for evaluation of the physical property change of PuO 2-x . Previously, oxygen potential of PuO 2-x was determined as functions of O/M ratios and temperatures, and the data were analysed based on defect chemistry [2]. The relationship between deviation, x and oxygen partial pressure 2 O P was evaluated, and x was found to be proportional to Po 2 -1/4 in the reducing region.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, oxygen potential of PuO 2-x was determined as functions of O/M ratios and temperatures, and the data were analysed based on defect chemistry [2]. The relationship between deviation, x and oxygen partial pressure 2 O P was evaluated, and x was found to be proportional to Po 2 -1/4 in the reducing region. This result showed that the defect cluster of oxygen vacancies is stable in non-stoichiometric PuO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The relationship between deviation, x and oxygen partial pressure 2 O P was evaluated, and x was found to be proportional to Po 2 -1/4 in the reducing region. This result showed that the defect cluster of oxygen vacancies is stable in non-stoichiometric PuO 2 .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Measurement of oxygen chemical diffusion in PuO_2‐x and analysis of oxygen diffusion in PuO_2‐x and (Pu,U)O_2‐x

Kato

Uchida

Sunaoshi³

2012

Phys. Status Solidi C

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All available oxygen potential-temperature-composition data for the calcium fluorite-structure ** phase were retrieved from the literature and utilized in the development of a binary solid solution representation of the phase. The data and phase relations are found to be best described by a solution of [Pui^C^] and [PuO 2 ] with a temperature dependent interaction energy. The fluorite-structure is assumed to be represented by a combination of the binaries' and CUO^^, and thus treated as a solution of [Pu^/302], [PuO 2 ], [UO 2 ], and either [U 2 0i,.5] or [U3O7]. The resulting equations well reproduce the large amount of oxygen potential-temperature-composition data for the mixed oxide system, all of which were also retrieved from the literature. These models are the first that appear to display the appropriate oxygen potential-temperature-composition and phase relation behavior over the entire range of existence for the phases.

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Section: Apparatus and Measurement Techniquementioning

confidence: 99%