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A study of the structural phase transformation in the shape memory alloy Co2NbSn
online resourceposted on 10.05.2006, 17:15 by Klaus-Ulrich Neumann, T. Kanomata, B. Ouladdiaf, K.R.A. Ziebeck
Resistivity, specific heat and magnetization measurements on the shape memory compound Co2NbSn corroborate the presence of ferromagnetic order below 119 K and a structural phase transition at 235 K. High-resolution neutron powder diffraction measurements confirmed that the high-temperature cubic phase has the Heusler L21 structure and established that the low-temperature phase is orthorhombic with space group Pmma. The thermal variation of the specific heat at low temperatures indicates a high density of states consistent with electronic structure calculations and a band Jahn–Teller mechanism for the transformation.