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BINARY SYSTEMS

Ag-S :  Monotectic point at 906 ± 1 ° C, 1.8 per cent S ; two-liquid region from this point to 11.85 per cent S. Ag2S, the only compound, melts congruenti at 838° C. Eutectic with Ag at 804 ± 2° C and 12.3 per cent S. A second two-liquid region exists above 740 ± 2° C from 14.35 to >99 per cent S. Eutectic with S at 119.3 ± .2° C. Ag2 S has three polymorphs: below 176.3 ± .5° C (with Ag) and below 177.8 ± .7° C (with S), it is monoclinic (acanthite). Above this temperature, but below 586 ± 3 °C (with Ag) and below 622 ± 3 °C (with S) it is cubic (argentite). The high-temperature polymorph has unknown structure [26], 
Ag-Sb :  Maximum solid solution of Sb in Ag is 8.0 per cent at 702.5° C, where a ζ phase with 9.8 per cent Sb melts incongruently to Ag2 Sb solid solution and liquid with 18.6 per cent Sb. The ζ phase is hexagonal and varies in composition from 9.8 to 18 per cent Sb. The ζ phase (dyscrasite) with 20 per cent Sb melts incongruently at 558° C to ζ and liquid with 27.3 per cent Sb. It forms solid solutions with 20 to 29 per cent Sb; there are two polymorphs, both of which are orthorhombic. The inversion is at 440° C with ζ and at 449° C with Sb. Eutectic between ζ and Sb is at 485° C and 
Ag-S :  Monotectic point at 906 ± 1 ° C, 1.8 per cent S ; two-liquid region from this point to 11.85 per cent S. Ag2S, the only compound, melts congruenti at 838° C. Eutectic with Ag at 804 ± 2° C and 12.3 per cent S. A second two-liquid region exists above 740 ± 2° C from 14.35 to >99 per cent S. Eutectic with S at 119.3 ± .2° C. Ag2 S has three polymorphs: below 176.3 ± .5° C (with Ag) and below 177.8 ± .7° C (with S), it is monoclinic (acanthite). Above this temperature, but below 586 ± 3 °C (with Ag) and below 622 ± 3 °C (with S) it is cubic (argentite). The high-temperature polymorph has unknown structure [26], 
Ag-Sb :  Maximum solid solution of Sb in Ag is 8.0 per cent at 702.5° C, where a ζ phase with 9.8 per cent Sb melts incongruently to Ag2 Sb solid solution and liquid with 18.6 per cent Sb. The ζ phase is hexagonal and varies in composition from 9.8 to 18 per cent Sb. The ζ phase (dyscrasite) with 20 per cent Sb melts incongruently at 558° C to ζ and liquid with 27.3 per cent Sb. It forms solid solutions with 20 to 29 per cent Sb; there are two polymorphs, both of which are orthorhombic. The inversion is at 440° C with ζ and at 449° C with Sb. Eutectic between ζ and Sb is at 485° C and 

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