Quasielastic diffuse neutron scattering from fluorites in the fast ion phase

Clausen, K.N.; Hayes, W.; Hutchings, M. T.; Kjems, Jørgen; Schnabel, Peter; Smith, Chris

doi:10.1016/0167-2738(81)90323-4

Cited by 35 publications

(11 citation statements)

References 3 publications

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“…These data sets also merge nicely with the low temperature heat capacity measurements of Westrum and Osborne [27]. With regard to data on volume thermal expansivity [37][38][39][41][42][43][44][45][46][47][48][49][50][51], the scatter Fig. 3.…”

Section: Application Of Key Approximations: a Case Study On Thoriamentioning

confidence: 78%

Development of a thermodynamic framework for a combined analysis of thermal and elastic properties based on a linear scaling relation between logarithmic bulk modulus and enthalpy

Raju

Sivasubramanian

Mohandas

2004

Journal of Alloys and Compounds

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Section: Application Of Key Approximations: a Case Study On Thoriamentioning

confidence: 78%

Development of a thermodynamic framework for a combined analysis of thermal and elastic properties based on a linear scaling relation between logarithmic bulk modulus and enthalpy

Raju

Sivasubramanian

Mohandas

2004

Journal of Alloys and Compounds

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“…The extensive diffusion is characterized by a large decrease in the elastic constant C 11 [2,19,29,20] and specific heat anomaly at the transition temperature, T c . Neutron scattering measurements indicate that the anionic sub-lattice in UO 2 becomes heavily disordered in the region of 2300 K [2,3,19,30]. Measured elastic constants [2,3,29] do show a softening above 2400 K in the region where fast-ion behavior is expected in UO 2 , but the variation below this temperature is already very large.…”

Section: Introductionmentioning

confidence: 84%

Atomistic modeling of the vibrational and thermodynamic properties of uranium dioxide, UO2

Goel

Choudhury

Chaplot

2008

Journal of Nuclear Materials

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“…The comparison of the ratio of the circles' diameter (Dn/D1) (Table S1) with several compounds of Ref. [31] led to assign the crystal structure to a face centered cubic system. This result then appeared in good agreement with the aging of the initial hydroxide precipitates into hydrated dioxides, which adopt the classical fluorite-type structure of CeO 2 and AnO 2 compounds.…”

Section: Characterization Of the Precursorsmentioning

confidence: 99%

An original precipitation route toward the preparation and the sintering of highly reactive uranium cerium dioxide powders

Martinez

Clavier

Mesbah

et al. 2015

Journal of Nuclear Materials

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h i g h l i g h t sDense (U,Ce)O 2 pellets were prepared from highly reactive precursors. Nanosized hydrated oxides were first obtained through precipitation route. Direct sintering was performed by heating between 1350°C and 1550°C. Microstructures composed of dense materials with submicrometric grains were achieved. a b s t r a c tThe preparation of dense U 1Àx Ce x O 2 mixed dioxides pellets was achieved from the initial precipitation of highly reactive precursors. In a first step, a wet chemistry route, based on the mixture of U 4+ and Ce 4+ in acidic solution with large excess of NH 4 OH, was set up to reach the precipitation of the cations. The solid phase was then dried under vacuum to avoid aggregation phenomena. Further characterization of the powders by XRD, EDS and TEM revealed the formation of hydrated U 1Àx Ce x O 2 ÁnH 2 O that probably resulted from the aging of hydroxide compounds. Also, microscopy investigations evidenced the nanosized character of the powder which was associated to high values of specific surface area, typically in the 100-150 m 2 g À1 range.The behavior of U 1Àx Ce x O 2 ÁnH 2 O versus temperature was investigated in a second part. If the increase of the heat temperature allowed one to observe an improvement of the crystallization state linked with the growth of crystallites, it was also accompanied by a strong decrease of the powders reactivity. On this basis, sintering tests were conducted in reducing atmosphere on the compounds as prepared. Dilatometry experiments indicated a low densification temperature compared to other ways of preparation reported in the literature. Also, the pellets prepared after firing at different temperatures (1350-1550°C) showed that a wide range of microstructures was achievable. Particularly, bulk materials with densities of 90-95% of the calculated value could be prepared with average grain size ranging from around 100 nm to more than 5 lm. This simple process of elaboration of dense materials from highly reactive hydrated oxide precursor thus appears as a very interesting way to prepare actinide oxides materials.

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Quasielastic diffuse neutron scattering from fluorites in the fast ion phase

Cited by 35 publications

References 3 publications

Development of a thermodynamic framework for a combined analysis of thermal and elastic properties based on a linear scaling relation between logarithmic bulk modulus and enthalpy

Development of a thermodynamic framework for a combined analysis of thermal and elastic properties based on a linear scaling relation between logarithmic bulk modulus and enthalpy

Atomistic modeling of the vibrational and thermodynamic properties of uranium dioxide, UO2

An original precipitation route toward the preparation and the sintering of highly reactive uranium cerium dioxide powders

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