Фазовая диаграмма системы Pt-Y

К оглавлению: Другие диаграммы (Others phase diargams)


Pt-Y (Platinum-Yttrium) A. Palenzona and S. Cirafici The assessed Pt-Y phase diagram is tentative in most areas. There are negligible mutual solubilities of the solid elements. No experimental data on phase diagram determinations of the Pt-Y system are available except for some conflicting investigations on the Pt-richest eutectic side carried out by [76Hol], [83Vor], and [88Yif]. The assessed diagram is patterned largely on the basis of a presumed probable similarity to other heavy RE-Pt systems, in particular with the Er-Pt system, which is the only one with a partial determination of the diagram shape [Moffatt]. The discrepancy in the eutectic temperatures given by [83Vor] and [88Yif] is about 100 C. Although [83Vor] studied a larger number of alloys, [88Yif] gave a more accurate quantitative analysis of the only two compositions studied. It seems correct to place the eutectic temperature at the intermediate value of 1550 C and 7 at.% Y. Thus, regarding the melting point of Pt5Y claimed by [ 76Hol], it is probable that this temperature corresponds to the eutectic temperature L = Pt + Pt5Y; in fact, Pt5Y should display a peritectic behavior at a somewhat higher temperature like Er5Pt. Even if no experimental data on its occurrence are available, the presence of Pt4Y3 is supported by the existence of this phase for all rare earths [77Pal] except Eu. 59Com: V.B. Compton and B.T. Matthias, Acta Crystallogr., 12, 651-654 (1959). 59Dwi: A.E. Dwight and M.W. Newitt, U.S. At. Energy Comm., ANL-6099, 76-92 ( 1959). 61Dwi: A.E. Dwight, J.W. Downey, and R.A. Conner, Jr., Acta Crystallogr., 14, 75-76 (1961). 63Dwi: A.E. Dwight, J.B. Darby, Jr., D.J. Lam, and M.W. Nevitt, U.S. At. Energy Comm., ANL-6868, 303-305 (1963). 65Dwi: A.E. Dwight, R.A. Conner, Jr., and J.W. Downey, Acta Crystallogr., 18, 835-837 (1965). 65Geb: T.H. Geballe, B.T. Matthias, V.B. Compton, E. Corenzwit, G.W. Hull, Jr., and L.D. Longinotti, Phys. Rev., 137, 119-127 (1965). 67Bro: W. Bronger, J. Less-Common Met., 12, 63-68 (1967). 71Kri: N.H. Krikorian, J. Less-Common Met., 23, 271-279 (1971). 72Ram: A. Raman, J. Less-Common Met., 26, 199-206 (1972). 73Erd: B. Erdmann and C. Keller, J. Solid State Chem., 7, 40-48 (1973). 76Hol: C.E. Holcombe, Jr., J. Less-Common Met., 44, 331-335 (1976). 77Pal: A. Palenzona, J. Less-Common Met., 53, 133-136 (1977). 78Ler1: J. LeRoy, J.M. Moreau, and D. Paccard, Acta Crystallogr., 34, 9-13 ( 1978). 78Ler2: J. LeRoy, J.M. Moreau, D. Paccard, and E. Parth‚, Acta Crystallogr., 34, 3315-3318 (1978). 79Ler: J. Le Roy, J.M. Moreau, D. Paccard, and E. Parth‚, Acta Crystallogr., 35, 1437-1439 (1979). 83Vor: L.I. Voronova, V.P. Polyakova, and E.M. Savitskii, Izv. Akad. Nauk SSSR, Met., 4, 176-179 (1983) in Russian; TR: Russ. Metall., 4, 140-142 (1983). 88Yif: X. Yifen and O. Loebich, J. Less-Common Met., 144, 301-309 (1988) in German. Submitted to the APD Program. Complete evaluation contains 1 figure, 2 tables, and 21 references. 1