Download citation
Download citation
link to html
For Ni–Mn–Sb ferromagnetic multifunctional alloys, the crystal structures of martensite variants and the orientation relationships between them are decisive factors for their magnetic field-induced behaviours and are hence of importance. Such information has rarely been reported in the literature. In the present work, the crystal structure, microstructure and orientation relationships of Ni–Mn–Sb martensite were thoroughly investigated by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). Through XRD analyses, the crystal structure of the martensite, including the crystal system, the space group, the lattice parameters and the atomic coordinates, was fully resolved. The structure is orthorhombic and can be represented with a 4O superstructure. EBSD analyses show that the Ni–Mn–Sb martensite has a lamellar form. One martensite lamella corresponds to one orientation variant. The lamellae are organized in long plate-shaped colonies. Within each colony, four distinct orientation variants (A, B, C and D) appear repeatedly and extend in roughly the same direction. The four variants are twin related to one another, with variants A and C (or variants B and D) forming a type I twin, variants A and B (or C and D) a type II twin, and variants A and D (or B and C) a compound twin. The complete twinning elements for each twin relation were thus fully determined. The interfaces between the variants were identified to be their corresponding twinning planes. All these results provide fundamental information for Ni–Mn–Sb alloys that is useful for interpreting their magnetic and mechanical characteristics.

Supporting information


Crystallographic Information File (CIF)
Contains datablocks global, I


Rietveld powder data file (CIF format)
Original powder XRD data

Computing details top

(I) top
Crystal data top
Mn1.52Ni2Sb0.48V = 210.53 Å3
Orthorhombic, PmmaZ = 4
a = 8.5788 ÅRiga Ku SmartLab radiation, λ = 1.540598 Å
b = 5.6443 ÅT = 293 K
c = 4.3479 Åblack
Data collection top
Radiation source: 9 KW rotating anodeScan method: step
Graphite monochromater2θmin = 20°, 2θmax = 120°, 2θstep = 0.02°
Data collection mode: reflection
Refinement top
Rp = 0.0940 restraints
Rwp = 0.1336 constraints
Rexp = 0.056Weighting scheme based on measured s.u.'s
R(F) = 0.097(Δ/σ)max = 11.618
5001 data pointsBackground function: 4 Legendre polynoms
Profile function: Pseudo-VoigtPreferred orientation correction: none
27 parameters
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
Atomic displacement parameters (Å2) top

Follow J. Appl. Cryst.
Sign up for e-alerts
Follow J. Appl. Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds