Thermal expansion measurements (from 4.2 to 300 K) with a three‐terminal capacitance method on the pseudobinary intermetallic system TiFexCo1−x show that at low temperatures the ferromagnetic alloys 0.4 ≦ x ≦ 0.75 contract with increasing temperature or exhibit greatly reduced thermal expansion. The results are compared with high pressure measurements and analyzed with the Stoner‐Edwards‐Wohlfarth model of very weak itinerant ferromagnetism.

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The thermal expansions of some SiFexCo1-x (x = 0.0, 0.5, 0.65, 0.8, 0.9 and 1.0) alloys have been measured from 4.2 to 15 K or well above their Curie temperatures using a three-terminal capacitance dilatometer. The ferromagnetic alloys in this series are shown to exhibit in their thermal expansions a negative magnetic contribution, comparable to that found in the weak itinerant ferromagnets ZrZn2, Ni3Al and NiPt. The present results for SiFexCo1-x alloys are discussed together with the previously reported similar data on the TiFexCo1-x system.