The Thermodynamic Properties of the f-Elements and their Compounds. Part 2. The Lanthanide and Actinide Oxides Rudy J. M. Konings, Ondrej Beneš, Attila Kovács, Dario Manara, David Sedmidubský, Lev Gorokhov, Vladimir S. Iorish, Vladimir Yungman, E. Shenyavskaya, and E. Osina Citation: Journal of Physical and Chemical Reference Data 43, 013101 (2014); doi: 10.1063/1.4825256 View online: http://dx.doi.org/10.1063/1.4825256 View Table of Contents: http://scitation.aip.org/content/aip/journal/jpcrd/43/1?ver=pdfcov Published by the AIP Publishing This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 78.131.95.159 On: Sun, 27 Apr 2014 17:09:58 The Thermodynamic Properties of the f-Elements and their Compounds. Part 2. The Lanthanide and Actinide Oxides Rudy J. M. Konings, a) Ondrej Beneš, Attila Kovács, Dario Manara, and David Sedmidubský b) European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, 76125 Karlsruhe, Germany Lev Gorokhov, Vladimir S. Iorish, c) Vladimir Yungman, E. Shenyavskaya, and E. Osina Joint Institute for High Temperatures, Russian Academy of Sciences, 13-2 Izhorskaya Street, Moscow 125412, Russia (Received 24 August 2012; accepted 4 March 2013; published online 10 January 2014) A comprehensive review of the thermodynamic properties of the oxide compounds of the lanthanide and actinide elements is presented. The available literature data for the solid, liquid, and gaseous state have been analysed and recommended values are presented. In case experimental data are missing, estimates have been made based on the trends in the two series, which are extensively discussed. Ó 2014 Euratom. [http://dx.doi.org/10.1063/ 1.4825256] CONTENTS 3.6.1. Polymorphism and melting point. 15 3.6.2. Heat capacity and entropy . 15 3.6.3. Enthalpy of formation . 15 1. Introduction ............................. 6 3.7. Nd2O3(cr,l). 16 2. Approach ............................... 6 3.7.1. Polymorphism and melting point. 16 2.1. Thermal functions of condensed phases . 6 3.7.2. Heat capacity and entropy . 16 2.2. Enthalpies of formation of condensed phases 7 3.7.3. Enthalpy of formation . 17 2.3. Thermal functions of gases . 7 3.8. Pm2O3(cr,l) . 17 2.4. Enthalpies of formation of gases . 8 3.8.1. Polymorphism and melting point. 17 2.5. Consistency and completeness . 9 3.8.2. Heat capacity and entropy . 17 3. The Lanthanide Oxides in Solid and Liquid State 9 3.8.3. Enthalpy of formation . 18 3.1. La O (cr,l) . 9 2 3 3.9. Sm2O3(cr,l) . 18 3.1.1. Polymorphism and melting point. 9 3.9.1. Polymorphism and melting point. 18 3.1.2. Heat capacity and entropy . 9 3.9.2. Heat capacity and entropy . 18 3.1.3. Enthalpy of formation . 10 3.9.3. Enthalpy of formation . 19 3.2. CeO (cr,l). 11 2 3.10. Eu2O3(cr,l).............................. 20 3.2.1. Melting point. 11 3.10.1. Polymorphism and melting point. 20 3.2.2. Heat capacity and entropy . 11 3.10.2. Heat capacity and entropy . 20 3.2.3. Enthalpy of formation . 11 3.10.3. Enthalpy of formation . 21 3.3. Ce O (cr,l) . 12 2 3 3.11. Eu3O4(cr)............................... 22 3.3.1. Polymorphism and melting point. 12 3.11.1. Polymorphism and melting point. 22 3.3.2. Heat capacity and entropy . 12 3.11.2. Heat capacity and entropy . 22 3.3.3. Enthalpy of formation . 13 3.11.3. Enthalpy of formation . 22 3.4. PrO2(cr,l) . 13 3.12. EuO(cr). 22 3.4.1. Structure . 13 3.12.1. Polymorphism and melting point. 22 3.4.2. Heat capacity and entropy . 13 3.12.2. Heat capacity and entropy . 22 3.4.3. Enthalpy of formation . 14 3.12.3. Enthalpy of formation . 22 3.5. PrO (cr,l) . 14 1.833 3.13. Gd2O3(cr,l) . 23 3.5.1. Melting point. 14 3.13.1. Polymorphism and melting point. 23 3.5.2. Heat capacity and entropy . 14 3.13.2. Heat capacity and entropy . 23 3.5.3. Enthalpy of formation . 14 3.13.3. Enthalpy of formation . 24 3.6. Pr O (cr,l) . 15 2 3 3.14. TbO2(cr). 24 3.14.1. Structure . 24 a)Electronic mail: [email protected]. 3.14.2. Heat capacity and entropy . 24 b)Permanent address: Institute of Chemical Technology, Technická 5, 16626 3.14.3. Enthalpy of formation . 24 Praha 6, Czech Republic. c) 3.15. Tb6O11(cr),Tb11O20(cr),Tb4O7(cr), Deceased on May 2012. Tb O (cr).............................. 25 Ó 2014 Euratom. 7 12 This article0047-2689/2014/43(1)/013101/95/$47.00 is copyrighted as indicated in the article. Reuse of AIP content013101-1 is subject to the terms at: http://scitation.aip.org/termsconditions.J. Phys. Chem. Ref. Data, Vol. 43, No. Downloaded 1, 2014 to IP: 78.131.95.159 On: Sun, 27 Apr 2014 17:09:58 013101-2 KONINGS ET AL. 3.15.1. Structure . 25 4.9.2. Enthalpy of formation . 44 3.15.2. Heat capacity and entropy . 25 4.10. TbO(g) . 44 3.15.3. Enthalpy of formation . 25 4.10.1. Heat capacity and entropy . 44 3.16. Tb2O3(cr,l). 25 4.10.2. Enthalpy of formation . 45 3.16.1. Polymorphism and melting point. 25 4.11. DyO(g) . 45 3.16.2. Heat capacity and entropy . 25 4.11.1. Heat capacity and entropy . 45 3.16.3. Enthalpy of formation . 26 4.11.2. Enthalpy of formation . 46 3.17. Dy2O3(cr,l) . 26 4.12. HoO(g) . 46 3.17.1. Polymorphism and melting point. 26 4.12.1. Heat capacity and entropy . 46 3.17.2. Heat capacity and entropy . 26 4.12.2. Enthalpy of formation . 47 3.17.3. Enthalpy of formation . 27 4.13. ErO(g). 48 3.18. Ho2O3(cr,l) . 27 4.13.1. Heat capacity and entropy . 48 3.18.1. Polymorphism and melting point. 27 4.13.2. Enthalpy of formation . 49 3.18.2. Heat capacity and entropy . 27 4.14. TmO(g). 49 3.18.3. Enthalpy of formation . 28 4.14.1. Heat capacity and entropy . 49 3.19. Er2O3(cr,l) . 29 4.14.2. Enthalpy of formation . 50 3.19.1. Polymorphism and melting point. 29 4.15. YbO(g) . 50 3.19.2. Heat capacity and entropy . 29 4.15.1. Heat capacity and entropy . 50 3.19.3. Enthalpy of formation . 29 4.15.2. Enthalpy of formation . 51 3.20. Tm2O3(cr,l) . 30 4.16. LuO(g) . 52 3.20.1. Polymorphism and melting point. 30 4.16.1. Heat capacity and entropy . 52 3.20.2. Heat capacity and entropy . 30 4.16.2. Enthalpy of formation . 52 3.20.3. Enthalpy of formation . 31 5. The Actinide Oxides in Solid 3.21. Yb2O3(cr,l) . 31 and Liquid State .......................... 53 3.21.1. Polymorphism and melting point. 31 5.1. Ac2O3(cr,l). 53 3.21.2. Heat capacity and entropy . 31 5.1.1. Polymorphism and melting point. 53 3.21.3. Enthalpy of formation . 31 5.1.2. Heat capacity and entropy . 53 3.22. Lu2O3(cr,l). 31 5.1.3. Enthalpy of formation . 53 3.22.1. Melting point . 31 5.2. ThO2(cr,l)................................ 53 3.22.2. Heat capacity and entropy . 32 5.2.1. Melting point. 53 3.22.3. Enthalpy of formation . 32 5.2.2. Heat capacity and entropy . 53 4. The Gaseous Lanthanide Oxides ............. 32 5.2.3. Enthalpy of formation . 54 4.1. LaO(g). 32 5.3. PaO2(cr,l)................................ 54 4.1.1. Heat capacity and entropy . 32 5.3.1. Melting point. 54 4.1.2. Enthalpy of formation . 33 5.3.2. Heat capacity and entropy . 54 4.2. CeO2(g).................................. 34 5.3.3. Enthalpy of formation . 54 4.2.1. Heat capacity and entropy . 34 5.4. γ-UO3.................................... 54 4.2.2. Enthalpy of formation . 34 5.4.1. Polymorphism. 54 4.3. CeO(g). 35 5.4.2. Heat capacity and entropy . 55 4.3.1. Heat capacity and entropy . 35 5.4.3. Enthalpy of formation . 55 4.3.2. Enthalpy of formation . 35 5.5. U3O8(cr) . 55 4.4. PrO(g) . 36 5.5.1. Polymorphism and melting point. 55 4.4.1. Heat capacity and entropy . 36 5.5.2. Heat capacity and entropy . 55 4.4.2. Enthalpy of formation . 37 5.5.3. Enthalpy of formation . 56 4.5. NdO(g) . 37 5.6. U4O9(cr) . 56 4.5.1. Heat capacity and entropy . 37 5.6.1. Polymorphism. 56 4.5.2. Enthalpy of formation . 39 5.6.2. Heat capacity and entropy . 56 4.6. PmO(g) . 39 5.6.3. Enthalpy of formation . 56 4.6.1. Heat capacity and entropy . 39 5.7. UO2(cr,l). 56 4.6.2. Enthalpy of formation . 40 5.7.1. Melting point. 56 4.7. SmO(g) . 40 5.7.2. Heat capacity and entropy . 57 4.7.1. Heat capacity and entropy . 40 5.7.3..