Modelling the sigma phase R. Mathieu, N. Dupin, J.-C Crivello, J.-M. Joubert, K. Yaqoob, A. Breidi, J.-M. Fiorani and N. David MATEC Web of Conferences, 3 (2013) 01076 Published online: 01 July 2013 DOI: 10.1051/matecconf/20130301076