A study of the structural phase transformation in the shape memory alloy Co₂NbSn

Authors: Neumann K-U.¹; Kanomata T.¹; Ouladdiaf B.²; Ziebeck K.R.A.¹

Source: Journal of Physics: Condensed Matter, Volume 14, Number 6, 2002 , pp. 1371-1380(10)

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Abstract:

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.

Language: English

Document Type: Miscellaneous

Affiliations: 1: Department of Physics, Loughborough University, LE11 3TU, UK 2: Institut Laue Langevin, BP156 Grenoble 38042, France

Publication date: 2002-01-01