Abstract
By using differential thermal analysis, metallography and X-ray examination, the La–Si phase diagram was constructed. La 5Si 3, La 3Si 2, La 5Si 4, LaSi were confirmed. Two lanthanum disilicides were found — LaSi 2-a1 (structure type α-GdSi 2) and LaSi 2-a2 (structure type α-ThSi 2), the two-phase region LaSi 2-a1+LaSi 2-a2 being very narrow. The LaSi and LaSi 2-a1 intermetallics melt congruently at 1620 and 1730°C, respectively. La 5Si 3, La 3Si 2, La 5Si 4 and LaSi 2-a2 form in peritectic reactions at 1260, 1470, 1570 and ∼1600°C, respectively. Three eutectics occur at 722±9 (11 at.% Si), 1528±9 (55.5 at.% Si) and 1205±7°C (82 at.% Si).
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