Signature of Austenitic to Martensitic Phase Transition in Ni2MnGa in Mn and Ni K-Edge XANES Spectra

Abstract:

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The XANES studies at Mn, Ni and Ga K-edge of Ni2MnGa compound have been carried out at room and low temperatures. The Mn K-edge and Ni K-edge spectra shows modulation in the post edge features when the sample is cooled below martensitic transition temperature. It is strongly reflected in the XANES of Mn K-edge where the peak after the edge gets totally suppressed when the sample is in martensitic phase. This peak shows a hysteretic behaviour when thermal cycling was done across the martensitic transition temperature. This clearly shows that the peak height is a measure of austenitic phase present at a particular temperature. This demonstrates the strong correlations of electronic states and crystal structures in these compounds.

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Periodical:

Edited by:

Lluis Mañosa, P.K. Mukhopadhyay and S.R. Barman

Pages:

175-180

DOI:

10.4028/www.scientific.net/AMR.52.175

Citation:

V.G. Sathe et al., "Signature of Austenitic to Martensitic Phase Transition in Ni2MnGa in Mn and Ni K-Edge XANES Spectra", Advanced Materials Research, Vol. 52, pp. 175-180, 2008

Online since:

June 2008

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$35.00

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