Solving structure of five-layered modulated martensite of Ni-Mn-Ga(-Fe) using single-crystal neutron diffraction
The Ni-Mn-Ga is the prototype magnetic shape memory material exhibiting broad range of material functionalities. These functionalities originate from supermobile twin boundaries which occur only in the modulated martensite structures. Despite numerous attempts, the structure of five-layer modulated martensite of Ni-Mn-Ga has still not been fully solved due to the combination of inevitable hierarchical twinning and structural modulation that evolves with temperature. Recently, we discovered sharp hysteretic transition between the commensurate (q=0.400) and incommensurate (0.400<q<0.428) modulation in Ni-Mn-Ga and Ni-Mn-Ga-Fe alloys indicated by the shift in satellite positions and, importantly, unusual number and intensity of high-order satellite reflections. The aim of the current proposal is to collect full single crystal diffraction patterns from the Ni-Mn-Ga and Ni-Mn-Ga-Fe single crystals for both commensurate and incommensurate state and solve the crystal structure in combination with conventional single crystal XRD.
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KLICPERA Milan; BINISKOS Nikolaos; Caņadillas-Delgado, L.; CEJPEK Petr; CHULIST Robert; FABELO ROSA Oscar Ramon and VERTAT Petr. (2023). Solving structure of five-layered modulated martensite of Ni-Mn-Ga(-Fe) using single-crystal neutron diffraction. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.DIR-299
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