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- W2010656372 abstract "Abstract The Nb-Os alloy system has been investigated over the entire composition range using metallographic, X-ray diffraction and electron microprobe techniques. The ϵ-Os solid solution extends to about 27 at.% Nb at high temperatures but this is reduced to about 20 at.% Nb at lower temperatures. Three intermediate phases occur in this system and all of them possess topologically close-packed structures of the Frank-Kasper type. These phases are χ (α-Mn type), σ (α-phase type) and β (A15 or βW-type). The α-Nb solid solution extends to about 19 at.% Os at high temperatures but only to about 13 at.% Os at lower temperatures. Two eutectic reactions occur at about 2120°C and 2175°C. The χ-phase is formed by a peritectic reaction at about 2270°C, the α-phase melts congruently at about 2200°C and the β-phase forms by a peritectoid reaction at about 1975°C. All the intermediate phases possess highly ordered structures with the larger (Nb) atoms preferring the sites having high coordination while the smaller (Os) atoms prefer the sites of lowest coordination." @default.
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- W2010656372 date "1977-01-01" @default.
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- W2010656372 title "The niobium-osmium constitution diagram" @default.
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- W2010656372 doi "https://doi.org/10.1016/0022-5088(77)90174-6" @default.
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