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ection III: Supplemental Literature Review

Np-Pu (Neptunium-Plutonium) H. Okamoto

The Np-Pu phase diagram in [Massalski2] was redrawn from [1985She], which reproduced the work of [1961Mar] with allotropic transformation temperatures adjusted to recently accepted values. [1961Poo] showed a partial Np-Pu phase diagram, but [1961Mar] has apparently superseded (same authors). [1961Cop] showed a complete Np-Pu phase diagram, but [1985She] preferred [1961Mar] because the measurement method was more reliable. Thermodynamic assessment of this system was attempted earlier by [1980Cha] and [1993Oga]. However, the application range was limited to the liquidus and the solidus. Figure 1 shows the Np-U phase diagram calculated by [2010Kur] based on the thermodynamic database created consistently for actinide elements. The calculated phase diagram agrees well with [1961Mar] in most part. The

Fig. 1

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disagreement is most noticeable with regard to the existing range of (bPu) and (aPu). Further experimental works are needed where mismatch between [1961Mar] and [2010Kur] is large. References 1961Cop: R.G. Cope, D.G. Hughes, R.G. Loasby, and D.C. Miller, The Plutonium-Ruthenium and Plutonium-Neptunium Binary Phase Diagrams, Plutonium 1960, Proc. Int. Conf. Plutonium Metall., E. Grison, W.B.H. Lord, and R.D. Fowler, Eds., 1961, p 280-289 1961Mar: P.G. Mardon, J.H. Pearce, and J.A.C. Marples, Constitution Studies on the Neptunium-Plutonium Alloy System, J. Less-Common Met., 1961, 3, p 281-292

Np-Pu phase diagram [2010Kur]

Journal of Phase Equilibria and Diffusion Vol. 34 No. 2 2013

Supplemental Literature Review: Section III 1961Poo: D.M. Poole, M.G. Bale, P.G. Mardon, J.A.C. Marples, and J.L. Nichols, Phase Diagrams of Some Plutonium Alloy Systems, Plutonium 1960, Proc. Int. Conf. Plutonium Metall., E. Grison, W.B.H. Lord, and R.D. Fowler, Eds., 1961, p 267280 1980Cha: K.S. Chan, J.K. Lee, and H.I. Aaronson, Kaufman Approach Calculations of Partial Phase Diagrams amongst Th, U, Np and Pu, J. Nucl. Mater., 1980, 92, p 237-242

1985She: R.I. Sheldon and D.E. Peterson, The Np-Pu (NeptuniumPlutonium) System, Bull. Alloy Phase Diagr., 1985, 6(3), 215-217 1993Oga: T. Ogawa, Alloying Behaviour among U, Np, Pu and Am Predicted with the Brewer Valence Bond Model, J. Alloys Compd., 1993, 194, p 1-7 2010Kur: K. Kurata, Thermodynamic Database on U-Pu-Zr-NpAm-Fe Alloy System II—Evaluation of Np, Am, and Fe Containing Systems, IOP Conf. Ser.: Mater. Sci. Eng., 2010, 9, 12023, 8 pp

Journal of Phase Equilibria and Diffusion Vol. 34 No. 2 2013

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