Transformation dia-paramagnétique dans les phases icosaédriques Mn-Pd-Al avec formation d'amas diamagnétiques

A dia-paramagnetic transition comes before melting of the icosahedral phases Mn-Pd-Al. The transition and the increase in stability given by palladium result in the occurrence of diamagnetic clusters. Previously, a similar mechanism has been suggested to take place and allows description of the polytypisme encountered in MM'P and MM'As compounds