Martensitic and order-disorder transformations studied by in-situ synchrotron X-ray diffraction

The current proposal is a continuation of an ongoing project involving two PhD students, where we aim at investigating the crystal structures, and phase transformations in two different material classes: (1) MM’X-type compounds showing a martensitic structural transformation (MST), and (2) FeNi phases showing an ordering transformation to form Tetrataenite. During the recent beamtime 01-02-1229 (June 2021) at SNBL-BM01, we studied several compounds in the (MnNiSi)1-x(Fe2Ge)x system, that were obtained by isostructural alloying and arc melting. Those results are currently still being analyzed. In the current proposal, we plan to expand the studies to (MnNiSi)1-x(Fe2Al)x and (MnNiSi)1-x(FeCuGe)x systems with the aim to reduce the content of Germanium and to establish a magneto-structural coupling around RT.