Počet záznamů: 1

Probing structure and microstructure of epitaxial Ni–Mn–Ga films by reciprocal space mapping and pole figure measurements

  1. 1.
    0353131 - FZU-D 2011 RIV GB eng J - Článek v odborném periodiku
    Ge, Y. - Heczko, Oleg - Hannula, S.-P. - Fähler, S.
    Probing structure and microstructure of epitaxial Ni–Mn–Ga films by reciprocal space mapping and pole figure measurements.
    Acta Materialia. Roč. 58, č. 20 (2010), 6665-6671 ISSN 1359-6454
    Grant ostatní:AVČR(CZ) M100100913
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: reciprocal space mapping * thin film * Ni–Mn–Ga * martensite * magnetic shape memory
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.781, rok: 2010

    The crystal structure and complex twinning microstructure of epitaxial Ni–Mn–Ga films on (1 0 0) MgO substrates was studied by X-ray diffraction using 2θ scans, pole figure measurements and reciprocal space mapping (RSM). Above the martensitic transformation temperature the film consists of single austenite phase with lattice constant a = 5.81A at 419 K. At room temperature some epitaxially grown residual austenite with a = 5.79A remains at the interface with the substrate, followed by an intermediate layer exhibiting orthorhombic distortion, atrans = 6.05A, btrans = 5.87A, ctrans = 5.73A and a major fraction of 14M (7M) martensite, a = 6.16A, b = 5.79A, c = 5.48A. The seven-layered modulation of this metastable martensite structure is directly observed by RSM. The intermediate phase observed close to interface indicates the existence of an instable, pre-adaptive martensite phase with a short stacking period.
    Trvalý link: http://hdl.handle.net/11104/0192458