Фазовая диаграмма системы Cr-Sb

К оглавлению: Другие диаграммы (Others phase diargams)

Cr-Sb (Chromium-Antimony) M. Venkatraman and J.P. Neumann The assessed phase diagram for the Cr-Sb system is based on the experimental data of [07Wil] and is essentially the same as that of [Hansen]. The diagram is characterized by complete solubility in the liquid state and by the presence of two intermediate phases-CrSb and CrSb2. CrSb has the hexagonal NiAs-type structure, whereas CrSb2 has the orthorhombic FeS2(marcasite)-type structure. The intermediate phase Cr3Sb2, reported by [41Mas], does not exist. In the assessed diagram, the Cr liquidus curve is estimated; the curve given by [07Wil] was adjusted to be consistent with the presently accepted value of 1863 C for the melting temperature of pure Cr [Melt]. The low melting temperature of Cr, reported by [07Wil] as 1553 C, is undoubtedly due to the low purity of the Cr used (~99 wt.%), as well as to the use of a nitrogen atmosphere for the experiment. The effect of these factors on the phase diagram can be expected to decrease with increasing Sb content; the melting point of pure Sb, observed by [07Wil] at 630 C, is in very good agreement with the accepted value of 630.755 C [Melt]. [72Spe] carried out rapid-quenching experiments of liquid Cr-Sb alloys containing 88 to 94 at.% Sb. The resulting thin films showed, in addition to the presence of the two equilibrium phases CrSb2 and (Sb), the appearance of a metastable phase. According to the X-ray diffraction analysis of an alloy with 90 at.% Sb, this phase has a simple cubic aPo-type structure with a lattice parameter a = 0.3074 nm. [69Nag] studied the effect of hydrostatic pressure up to 150 kbar on the lattice parameters of CrSb at room temperature. At 80 to 100 kbar, an anomaly in the isothermal compressibility was observed; [69Nag] suggested that the anomaly is related to the magnetic transition from the antiferromagnetic to the paramagnetic state. CrSb and CrSb2 are paramagnetic at elevated temperatures; they become antiferromagnetic at lower temperatures. [82Rei] indicated a N‚el temperature of 705 с 20 K. The variation of the N‚el temperature with the composition of the CrSb phase has not been established. Studies in ternary systems have shown that the substitution of Cr by Mn [82Rei], as well as the substitution of Sb by Te [66Tak], lowers the N‚el temperature of CrSb. Using neutron diffraction [70Hol], calorimetry [78All], and magnetic susceptibility measurements [79Kje], values of 273 с 2 K, 274 с 0.5 K, and 274 K, respectively, were obtained for the N‚el temperatureof CrSb2. The substitution of Cr by Fe lowers the N‚el temperature of CrSb2 [79Kje]. [56Abr] and [69Ada] measured the electrical conductivity of CrSb2 as a function of temperature. They established that CrSb2 is a semiconductor with an energy band gap of 0.16 eV [56Abr] or 0.14 eV [69Ada] at room temperature. 07Wil: R.S. Williams, Z. Anorg. Chem., 55, 1-33 (1907) in German. 27Jon: W.F. de Jong and H.W.V. Willems, Physica, 7, 74-79 (1927) in Dutch. 27Oft: I. Oftedal, Z. Phys. Chem., 128, 135-153 (1927) in German. 41Mas: G. Masing and H.J. Wallbaum, Nachr. Akad. Wiss. G”ttingen, Math.-Phys. Kl., (1), 32-36 (1941) in German. 43Har: H. Haraldsen and T. Rosenqvist, Tidsskr. Kjemi, Bergves. Metall., 3(5), 81-82 (1943) in Norwegian. 48Har: H. Haraldsen, T. Rosenqvist, and F. Gronvold, Arch. Math. Naturvidensk., 4, 94-135 (1948). 52Sno: A.I. Snow, Phys. Rev., 85, 365 (1952). 53Wil: B.T.M. Willis, Acta Crystallogr., 6, 425-426 (1953). 56Abr: N.Kh. Abrikosov and V.F. Bankina, Dokl. Akad. Nauk SSSR, 108(4), 627- 628 (1956) in Russian. 56Hir: T. Hirone, S. Maeda, and I. Tsubokawa, J. Phys. Soc. Jpn., 11(10), 1083- 1087 (1956). 57Lot: F.K. Lotgering and E.W. Gorter, Phys. Chem. Solids, 3, 238-249 (1957). 63Tak: W.J. Takei, D.E. Cox, and G. Shirane, Phys. Rev., 129, 2008-2018 (1963). 66Tak: W.J. Takei, D.E. Cox, and G. Shirane, J. Appl. Phys., 37(3), 973-974 ( 1966). 68Hol: H. Holseth and A. Kjekshus, Acta Chem. Scand., 22, 3273-3283 (1968). 69Ada: K. Adachi, K. Sato, and M. Matsuura, J. Phys. Soc. Jpn., 26(4), 906-910 (1969). 69Kje: A. Kjekshus and K.P. Walseth, Acta Chem. Scand., 23(8), 2621-2630 (1969) . 69Nag: H. Nagasaki, I. Wakabayashi, and S. Minomura, J. Phys. Chem. Solids, 30, 2405-2408 (1969). 70Bje: E. Bjerkelund and A. Kjekshus, Acta Chem. Scand., 24(9), 3317-3325 ( 1970). 70Hol: H. Holseth, A. Kjekshus, and A.F. Andresen, Acta Chem. Scand., 24(9), 3309-3316 (1970). 72Spe: J.D. Speight, Metall. Trans., 3, 1011-1012 (1972). 74Kal: A. Kallel, H. Boller, and E.F. Bertaut, J. Phys. Chem. Solids, 35, 1139- 1152 (1974). 78All: A. Alles, B. Falk, E.F. Westrum, Jr., and F. Gronvold, J. Chem. Thermodyn., 10, 103-116 (1978). 79Kje: A. Kjekshus, P.G. Peterzens, T. Rakke, and A.F. Andresen, Acta Chem. Scand. A, 33, 469-480 (1979). 82Rei: W. Reimers, E. Hellner, W. Treutmann, and G. Heger, J. Phys. C., 15, 3597-3615 (1982). Submitted to the APD Program. Complete evaluation contains 1 figure, 4 tables, and 34 references. Special Points of the Cr-Sb System