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 TVT, 2013, Volume 51, Issue 2, Pages 243–252 (Mi tvt79)

Thermophysical Properties of Materials

Defect structure and the phase diagram of uranium dioxide

E. P. Pakhomov

Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia

Abstract: Positions of the phase boundaries of pure uranium dioxide $\mathrm{UO}_{2-x}$ are calculated under the assumption that damage (melting) of the crystal lattice is caused by filling it with defects. The conditions of complete filling of the crystal lattice with individual defects are analyzed. The equilibrium reaction rate constants are determined for the high-temperature forms of interaction of the crystal with oxygen of ambient gaseous medium. The position of the monotectic point is found for $x>0$. The melting point parameters are determined for stoichiometric uranium dioxide and uranium dioxide with the maximum dense packing of the defects. A retrograde behavior of the solidus curve in the region $x>0$ and anisotropy of properties near the point of congruent melting are predicted. The complex character of the behavior of the boundaries of $\mathrm{U}_4\mathrm{O}_9$ and $\mathrm{U}_3\mathrm{O}_8$ phases is explained. The reason of discrepancy between the results of two different measurements of solidus temperature in the region $x<0$ is explained qualitatively, and the possibility of the existence of solid uranium dioxide up to $3400$ K under certain conditions is predicted.

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English version:
High Temperature, 2013, 51:2, 215–223

Bibliographic databases:

UDC: 546.791:548.4:544.22.022.342:544.015.3

Citation: E. P. Pakhomov, “Defect structure and the phase diagram of uranium dioxide”, TVT, 51:2 (2013), 243–252; High Temperature, 51:2 (2013), 215–223

Citation in format AMSBIB
\Bibitem{Pak13} \by E.~P.~Pakhomov \paper Defect structure and the phase diagram of uranium dioxide \jour TVT \yr 2013 \vol 51 \issue 2 \pages 243--252 \mathnet{http://mi.mathnet.ru/tvt79} \elib{http://elibrary.ru/item.asp?id=18822188} \transl \jour High Temperature \yr 2013 \vol 51 \issue 2 \pages 215--223 \crossref{https://doi.org/10.1134/S0018151X13020144} \isi{http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&DestLinkType=FullRecord&DestApp=ALL_WOS&KeyUT=000320157900011} \elib{http://elibrary.ru/item.asp?id=20445665} \scopus{http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-84880656292} 

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Citing articles on Google Scholar: Russian citations, English citations
Related articles on Google Scholar: Russian articles, English articles

This publication is cited in the following articles:
1. E. P. Pakhomov, “The mechanism of noncongruence of melting and determination of composition of the uranium dioxide melt on the basis of its defect structure”, High Temperature, 51:4 (2013), 476–481
2. E. P. Pakhomov, “About Melting Temperature of Crystalline Materials”, High Temperature, 52:4 (2014), 606–608
3. Kuksin A.Yu. Smirnova D.E., “Calculation of Diffusion Coefficients of Defects and Ions in Uo2”, Phys. Solid State, 56:6 (2014), 1214–1223
4. S. V. Starikov, “Atomistic simulating of the process of defects formation in uranium dioxide during fission fragments flying through”, High Temperature, 53:1 (2015), 55–61
5. Smirnova D.E., Kuksin A.Yu., Starikov S.V., Stegailov V.V., “Atomistic Modeling of the Self-Diffusion in Gamma-U and Gamma-U-Mo”, Phys. Metals Metallogr., 116:5 (2015), 445–455
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