Фазовая диаграмма системы B-Lu

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B-Lu (Boron-Lutetium) P.K. Liao and K.E. Spear Very little experimental data on the phase equilibria for the Lu-B system are available. The assessed phase diagram is taken from [76Spe] and is based primarily on the similarity among the Lu-B, Tm-B, and Er-B systems. The liquidus curves for the Lu-B system are largely estimated. The equilibrium phases are (1) the liquid, L; (2) the terminal solid solution, cph (Lu); (3) the terminal solid solution, rhombohedral (bB); and (4) four intermediate compounds, LuB2, LuB4, LuB12, and LuB66. Both (bB) and (Lu) solid solutions have negligible composition ranges. The hexaborides are the most studied of the RE-boride phases and have been reported for all of the RE metals. However, the Lu hexaboride appears to be unstable with respect to the other condensed phases in the Lu-B system. The homogeneity ranges of the Lu borides have not been studied experimentally, but all are expected to be small. 58Ste: A.A. Stepanova and N.N. Zhuravlev, Sov. Phys. Crystallogr., 3, 90-91 ( 1958). 61Lap: S. LaPlaca, I. Binder, and B. Post, J. Inorg. Nucl. Chem., 18, 113-117 ( 1961). 63Prz: M. Przybylska, A.H. Reddoch, and G.J. Ritter, J. Am. Chem. Soc., 85, 407-411 (1963). 65Gie: R.F. Giese, Jr., J. Economy, and V.I. Matkovich, Z. Kristallogr., 122, 144-147 (1965). 70Car: J.-O. Carlsson and T. Lundstrom, J. Less-Common Met., 22, 317-320 (1970) . 71Pad: Yu.B. Paderno, V.V. Odintsov, I.I. Timofeeva, and L.A. Klochkov, High Temp., 9(1), 175-177 (1971). 72Fis: Z. Fisk, A.S. Cooper, P.H. Schmidt, and R.N. Castellano, Mater. Res. Bull., 7(4), 285-288 (1972). 72Sch: K. Schwetz, P. Ettmayer, R. Kieffer, and A. Lipp, J. Less-Common Met., 26, 99-104 (1972) in German. 76Spe: K.E. Spear, Phase Diagrams, Vol. 4, Materials Science and Technology, Academic Press, New York, 91-159 (1976). 77Cal: B. Callmer, Acta Crystallogr. B, 33, 1951-1954 (1977). Submitted to the APD Program. Complete evaluation contains 1 figure, 3 tables, and 18 references. Special Points of the Lu-B System