Incommensurate modulations in stoichiometric Ni2MnGa ferromagnetic shape memory alloy: An overview

TL;DR

This paper reviews recent findings on incommensurate modulations in Ni2MnGa ferromagnetic shape memory alloy, demonstrating that incommensurate models better explain diffraction data than commensurate ones.

Contribution

It provides evidence that incommensurate modulation models accurately describe the diffraction patterns of Ni2MnGa phases, improving understanding of its structural properties.

Findings

Incommensurate modulation vectors are identified for premartensite and martensite phases.

Incommensurate models fit diffraction data better than commensurate models.

Periodicities of 3M and 7M are confirmed for the phases.

Abstract

This article presents a brief overview of our recent work on the nature of long period modulation in the premartensite and martensite phases of Ni2MnGa ferromagnetic shape memory alloy using high resolution synchrotron x-ray powder diffraction patterns. The commensurate structure model using the Pnnm space group is unable to account for the peak positions of the satellite reflections that appear due to modulations correctly. LeBail and Rietveld refinements using the (3+1)-D super space group $Immm(00\gamma)s00$ show that the peak positions of all the reflections, including the satellites, can be explained satisfactorily using incommensurate modulations for both the premartensite and martensite phases. The incommensurate modulation vectors are found to be q= 0.33761(5)c* = (1/3+$\delta$1)c* and 0.43160(3)c*= (3/7+$\delta$2)c*, where $\delta$1 and $\delta$2 are the degrees of incommensuration for the premartensite and martensite phases, respectively. The periodicity of the closest rational approximant of the premartensite and martensite phases are confirmed to be 3M and 7M, respectively, in agreement with single crystal diffraction results.