Some thermochemical studies of cesium uranate, molybdate and chromate

Böse, Olaf; Sundaresan, M.; Tangri, R.P.; Kalyanaraman, R.; Schumacher, G.

doi:10.1016/0022-3115(85)90301-0

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…Based on the calculation results and a previous work [9], CsI and CsTeO 3 might be removed below 1000°C, but a higher operation temperature might be required for Cs 2 UO 4 and Cs 2 MoO 4 . For the latter, Cordfunke et al [15] [23,24]. As mentioned above, it was experimentally shown that the addition of hydrogen helps the release of Cs [22].…”

Section: Discussionmentioning

confidence: 92%

“…The formation of Cs 2 U 2 O 7 as a decomposition product of Cs 2 UO 4 was also observed in a thermo-gravimetric experiment [23], and it was also revealed that the presence of water accelerates the decomposition of Cs 2 UO 4 . On the other hand, the Cs 2 U 4 O 12 phase was reported as a decomposition product of Cs 2 UO 4 by Bose et al [24] and Huang et al [22]. It was suggested that the different vapor pressure of water, 2.77-17.5 Torr for the Cs 2 U 2 O 7 case [23] and 0.1-1 Pa for the Cs 2 U 4 O 12 case [22], might have caused a different decomposition product.…”

Section: Cs-u Systemmentioning

confidence: 95%

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Simulation of Cs behavior during the high temperature voloxidation process using the HSC chemistry code

Jeon

Shin

Park

et al. 2012

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 92%

Section: Cs-u Systemmentioning

confidence: 95%

Simulation of Cs behavior during the high temperature voloxidation process using the HSC chemistry code

Jeon

Shin

Park

et al. 2012

Journal of Nuclear Materials

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“…22 Direct reaction calorimetry consists of carrying out in situ in the calorimeter the reaction whose enthalpy is to be determined. Only Bose et al 15 used this method to determine the enthalpy of formation of Cs 2 MoO 4 .…”

Section: Introductionmentioning

confidence: 99%

“…However, Cs 2 O is also very reactive with the humidity of the ambient air. For this reason, Bose et al 15 used a much more stable carbonate reference to introduce cesium, the reaction being…”

Section: Introductionmentioning

confidence: 99%

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Calorimetric Determination of the Formation Enthalpies of Cs Polymolybdates at 298.15 K and 0.1 MPa

et al. 2020

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Samples of cesium polymolybdates Cs2Mo n O3n+1 with n = 2, 3, 5, and 7 have been synthesized by melting and cooling stoichiometric mixtures of commercially available Cs2MoO4 and MoO3 powders. The single-phase character of the samples has been checked by X-ray diffraction. The standard enthalpies of formation of the Cs2Mo n O3n+1 polymolybdates with n = 1, 2, 3, 5, and 7 have been measured by solution calorimetry in dilute (CsOH·H2O) solvent at 298.15 K under 0.1 MPa. The values found for the mono and dimolybdates, Δf H° (Cs2MoO4) = −1513.56 ± 1.11 kJ mol–1, Δf H° (Cs2Mo2O7) = −2301.84 ± 2.37 kJ mol–1, are in good agreement with the already available calorimetric measurements. To our knowledge, this is the first time that the enthalpies of formation of cesium tri, penta, and heptamolybdates are measured: Δf H° (Cs2Mo3O10) = −3077.17 ± 3.47 kJ mol–1, Δf H° (Cs2Mo5O16) = −4601.70 ± 5.96 kJ mol–1, and Δf H° (Cs2Mo7O22) = −6087.16 ± 8.79 kJ mol–1, respectively. The convex shape of the curve constructed from the formation enthalpies of the Cs2Mo n O3n+1 polymolybdates referred to the Cs2MoO4 and MoO3 oxides is consistent with the Cs2MoO4–MoO3 pseudobinary diagram.

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XANES study on novel mixed valent A₂U₄O₁₂(A = K, Rb or Tl) uranates

Misra¹,

Lahiri²,

Mudher³

et al. 2008

X-Ray Spectrometry

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Alkali metal (Na, K, Rb, and Cs) uranates are likely to form in operating or transient reactor conditions by interaction of coolant/fission products with uranium oxide fuel. The valency of uranium in uranates formed in reactor operating conditions plays an important role in migration of fission products as well as in uranium diffusion in the fuel and thus determines fuel behavior during reactor operation. X-ray absorption near edge structure (XANES) measurements on uranates K 2 U 4 O 12 , Rb 2 U 4 O 12 , and Tl 2 U 4 O 12 have been made to determine the valency of uranium in these compounds. XANES analysis reveals that uranium is present in mixed valence state in these compounds, as U(V) and U(VI). The ratio of uranium (V) to (VI) states (determined from XANES analysis), in all the compounds, does not conform to 1 : 1 as required by their chemical formula. The reason for this mismatch may be the instability of U(V) state during sample preparation in these compounds as well as reference compounds.

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Some thermochemical studies of cesium uranate, molybdate and chromate

Cited by 11 publications

References 7 publications

Simulation of Cs behavior during the high temperature voloxidation process using the HSC chemistry code

Simulation of Cs behavior during the high temperature voloxidation process using the HSC chemistry code

Calorimetric Determination of the Formation Enthalpies of Cs Polymolybdates at 298.15 K and 0.1 MPa

XANES study on novel mixed valent A₂U₄O₁₂(A = K, Rb or Tl) uranates

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Some thermochemical studies of cesium uranate, molybdate and chromate

Cited by 11 publications

References 7 publications

Simulation of Cs behavior during the high temperature voloxidation process using the HSC chemistry code

Simulation of Cs behavior during the high temperature voloxidation process using the HSC chemistry code

Calorimetric Determination of the Formation Enthalpies of Cs Polymolybdates at 298.15 K and 0.1 MPa

XANES study on novel mixed valent A2U4O12(A = K, Rb or Tl) uranates

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XANES study on novel mixed valent A₂U₄O₁₂(A = K, Rb or Tl) uranates