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- W2059202447 abstract "The phase diagram of the system Ag2−xAuxS(0 ⩽ x ⩽ 1) was studied by DTA, DSC, and high-temperature X-ray measurements. Three ordered compounds exist at lower temperatures: β-Ag2S, β-Ag3AuS2 and β-AgAuS. At higher temperatures a solid solution with α-Ag2S structure (body-centered cubic, b.c.c.) exists for 0 ⩽ x ⩽ 0.29 (at a temperature of 250 °C). For x > 0.29 (at 250 °C) the solid solution is simple cubic (s.c.); no miscibility gap between these two phases has been observed. Landau's theory of second-order transitions was applied to show that the space groups of the b.c.c. and the s.c. forms (Im3m and Pn3m, respectively) allow a continuous transition. A structure model analogous to Rahlfs' statistical model of α-Ag2S has been applied to the body-centered and simple cubic solid solutions. The intensities of the X-ray reflections show that silver and gold occupy different positions, the gold atoms occupy, statistically, the positions 141414, 343414, 143434, 341434 in the s.c. form; in the b.c.c. form the positions 343434, 341414, 143414, 141434 are also occupied. Gold is in linear coordination by sulfur. Silver occupies the same positions as found for α-Ag2S. Both cubic phases are highly disordered; during the transition from b.c.c. to s.c. the disorder decreases." @default.
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- W2059202447 date "1976-08-01" @default.
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- W2059202447 title "Order-disorder transitions in the system Ag2−xAuxS (0 ⩽ x ⩽ 1)" @default.
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- W2059202447 doi "https://doi.org/10.1016/0022-5088(76)90007-2" @default.
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