Abstract
Measurements have been made of the thermal expansion and elastic constants of seven Cr-Si alloys in the concentration range from 0 to 3.42 at.% Si. The results point to the absence of a re-entrant feature in the vicinity of the triple point where the paramagnetic (P), commensurate (C) spin density wave and incommensurate (I) spin density wave states coexist, favouring the sequence of phase changes from P to C to I. The first-order C-P transitions are marked by discontinuities in the thermal expansion and by large ultrasonic attenuation near TN. Calculated latent heats associated with the first-order transitions compare well with direct measurements. Application of existing itinerant electron theories to the magnetoelastic data does not give the correct concentration dependence of the magnetic moment and Neel temperature.
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