Ternary phase diagrams, silicides

Only YbAgPb and La4Ni3Pb4 show peculiar structure types, which have first been observed for a plumbide. All other plumbides exhibit relatively simple structure types, which have been observed also for silicides, germanides, stannides, gallides, or indides. We expect that lead characteristic structures will form in the lead rich parts of the ternary systems, similar to the gallium and indium based phase diagrams. 

As an instance, the partial Ti-Si-B phase diagram is presented in Fig. 1. Silicon is not practically dissolved in TiB, and is fully concentrated in the metal matrix and in a ternary boro-silicide when it forms. This ternary boro-silicide phase of unknown structure (designated here as the T-phase) was found to be present as a very fine dispersoid around 200 nm in diameter in the three-phase eutectic (Ti) + T + TiB (Fig. 2). The ternary eutectic alloy hardness vv temperature plot shows a great potential for strengthening up to 600°C in comparison with the binary (Ti) + TiB (Fig. 3). 

An isothermal section of the Sc-Ce-Si phase diagram at 600"C has been investigated by Mokra (1979) and Bodak et al. (1981). Its figure was presented in the review of Rogl (1984b). Binary silicides of ceriiun and scandium do not dissolve more than 5at.% of Sc and Ce respectively. AU eight ternary compounds known in this system have variable... 

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