Determination of Crystal structure and local anti-site disorder of Co doped Ni-Mn-Sn shape memory alloy using powder X-ray diffraction and X

In this work we will investigate the crystal structure and anti-site disorder of Ni49-xCoxMn38Sn13 (x=0,2,4,6) and Ni49-xMn38-xCoxSn13 (x=0,2,4,6) as a function of temperature in both austenite and martensitic phases. In this work we want to perform temperature dependent high-resolution diffraction at ID22 beamline and XAFS at ID26 beamline. The high-resolution diffraction will be used to provide well resolved superstructure peaks in the modulated martensitic phases enabling atomic positions and space group of the martensitic structures to be determined. At the same time temperature dependent XAFS will find local anti-site bond distance and disorder to understand local distortion in the present of austenite and martensitic phases, which will help to know the magnetic transition, favouring a high magneto-caloric effect.