Abstract
Inelastic neutron scattering experiments and transmission electron microscopy have been used to study a single crystal of the Ni2MnGa shape memory Heusler alloy in a wide temperature range covering the parent phase (T > TI = 265 K), a recently discovered premartensitic (TI > T > TM) and martensitic (T < TM = 220 K) phase regions. A temperature dependent anomaly in the TA2 phonon dispersion in the parent phase was observed and related to the phase transformations. The premartensitic phase involves a transverse modulation of the parent cubic structure with a simple periodicity of 1/3 [110]. The approximately tetragonal lattice of the low-temperature martensite is distorted by transverse modulations with incommensurate wave vectors [ ζM ζM 0] and [ 2ζM 2ζM 0], ζM ≈0.43. The observed phenomena are attributed to electron-phonon interactions and anharmonic effects.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
