Abstract
The reaction of carbon with Gd 5Si 3 and Ho 5Si 3 was studied by arc melting the alloys with carbon and comparing the resultant phases with those identified previously in the Er 5Si 3 system. Ordering in the structure detected at x = 0.5 and x = 0.95 in Ln 5Si 3C x in both these systems is identical with that detected in the erbium system. Lower metal volatility in the gadolinium preparations produces single-phase systems more readily, but above x = 0.5 the carbide Gd 15C 19 is present in small amounts up to x = 0.95. Results for hardness, hydrolysis product distribution and X-ray and metallographic examination are presented.
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