The oxidation of uranium-cerium mononitride microspheres

The oxidation of uranium-cerium mononitride microspheres

The reaction of oxygen with UN and (U,Ce)N microspheres containing 15 and 30 mole % of cerium was studied in 6.6 kPa pressure of oxygen, under non-isothermal heating conditions, using a thermobalance coupled to a gas chromatograph for evolved gas analysis. For uranium mononitride the final product w...

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Veröffentlicht in:Journal of alloys and compounds 1997-07, Vol.257 (1), p.313-321
Hauptverfasser: Dehadraya, J.V., Mukerjee, S.K., Rama Rao, G.A., Vaidya, V.N., Venugopal, V., Sood, D.D.
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Sprache:eng
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(U,Ce)N
Kinetics
Oxidation
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container_end_page 321
container_issue 1
container_start_page 313
container_title Journal of alloys and compounds
container_volume 257
creator Dehadraya, J.V.
Mukerjee, S.K.
Rama Rao, G.A.
Vaidya, V.N.
Venugopal, V.
Sood, D.D.
description The reaction of oxygen with UN and (U,Ce)N microspheres containing 15 and 30 mole % of cerium was studied in 6.6 kPa pressure of oxygen, under non-isothermal heating conditions, using a thermobalance coupled to a gas chromatograph for evolved gas analysis. For uranium mononitride the final product was U 3O 8 with UO 2 and U 2N 3 as intermediate products. However, for (U,Ce)N containing 15 mole % of cerium, the final product of oxidation was MO 2+ x with sesqui-nitride as the intermediate product. The (U,Ce)N microspheres with 30 mole % of cerium ignited during the reaction forming a mixture of M 3O 8 and MO 2+ x . The kinetic parameters were evaluated and the mechanism of the reaction was suggested to explain the catalytic action of cerium on the oxidation of nitride.
doi_str_mv 10.1016/S0925-8388(97)00010-8
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subjects (U,Ce)N
Kinetics
Oxidation
title The oxidation of uranium-cerium mononitride microspheres
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