Martensitic transformation B2–R in Ni–Ti–Fe: experimental determination of the Landau potential and quantum saturation of the order parameter

Salje, Ekhard K. H. and Zhang, Huali and Planes, Antoni and Moya, Xavier (2008) Martensitic transformation B2–R in Ni–Ti–Fe: experimental determination of the Landau potential and quantum saturation of the order parameter. Journal of Physics: Condensed Matter, 20 (27). p. 275216. ISSN 0953-8984, 1361-648X DOI 10.1088/0953-8984/20/27/275216

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Abstract

The Landau potential of the martensitic phase transformation in Ni46.8Ti50Fe3.2 was determined using high resolution x-ray diffraction to measure the spontaneous strain and calorimetric measurements to determine the excess specific heat of the R phase. The spontaneous strain is proportional to the square of the order parameter which is tested by the relation of the excess entropy and the order parameter. The parameters of the Landau free energy were determined by fitting the temperature evolution of the order parameter and using the scaling between the excess entropy and the order parameter. The double well potential at absolute zero temperature was calculated and the interface energy and domain wall thickness were estimated.

Item Type: Article
Uncontrolled Keywords: + AREP08
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 20
Page Range: p. 275216
Identification Number: 10.1088/0953-8984/20/27/275216
Depositing User: Sarah Humbert
Date Deposited: 26 Jun 2012 09:47
Last Modified: 23 Jul 2013 10:04
URI: http://eprints.esc.cam.ac.uk/id/eprint/2535

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