Abstract
It is found that the antiferromagnetic alloy Mn85Ni9C6 can undergo its cubic-to-tetragonal crystal-structure transformation in two different ways - one corresponding to the familiar process whereby as a function of temperature the a and c dimensions of the crystallographic unit cell deviate continuously from equality, and another in which the a dimension changes continuously through the transition temperature but where the c dimension jumps discontinuously. This second effect has previously been recorded in the literature for the closely related alloy Mn80Ni20, but passed unremarked. Both kinds of transition are of second order. However, the two types of transformation have completely different critical behaviour, the second kind moreover tending to show two temperature ranges with different critical indices. Analysis of the data indicates that the magnetism of the alloy is fundamentally involved.
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