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- W144825248 abstract "An experimental investigation of the structural and magnetic properties of Iron basedferromagnetic shape memory alloys Pd57In25Fe18, Ti50Pd40Fe10, Ti50Pd35Fe15, FeMnSi,Fe66.7Mn26.8Si6.5 and Fe57.4Mn35Si7.6 is reported. Magnetisation measurements and highresolution powder neutron diffraction measurements were used to characterise the structuralproperties of each alloy. The parent phase of the Pd57In25Fe18 specimen has a FCC unit cell,space group Fm3m and lattice parameter a=6.293 ± 0.006A. The Fe atoms are essentiallyequally distributed on to the 4a and 4b sites with the Pd occupying the 8c site. On cooling thesample transforms into a tetragonal structure with I 4 / mmm space group and cell parametersa=4.097 ± 0.004A and c=7.289 ± 0.007A. Magnetisation measurements performed on thespecimen found Tc=140 ± 10K and a moment per formula unit of 1.39 ± 0.03μB. The inversesusceptibility has a Curie-Weiss variation, which yields a paramagnetic Curie temperature of159 ± 10K, an effective paramagnetic moment of 6.93 ± 0.06μB and a paramagnetic moment μpof 2.86 ± 0.03μB which is close to that generally observed for Fe on an FCC lattice. Neutrondiffraction measurements performed on Ti50Pd50-xFex compounds have confirmed the parentphase to be a cubic B2-type structure with the Pm3m space group with lattice parametersa=3.134 ± 0.007A when x=10 and a=3.118 ± 0.009A when x=15. On cooling, the martensiticphase transformation occurs and the alloys transform into an orthorhombic B19 structure( Pmma ) with a 3-fold modulation. The lattice parameters were determined as a=13.853 ±0.001A, b=2.872 ± 0.001A and c=4.513 ± 0.002A when x=10 and a=13.465 ± 0.002A, b=2.923± 0.002A and c=4.526± 0.001A when x=15. The Curie temperature has been estimated usingthe Brillouin J=1 function as Tc~ 470 ± 10K when x=10 and Tc~523 ± 10K when x=15. For theFeMnSi specimen, the stoichiometry of alloys is consistent with that of C1b compounds. TheF 43m space group was employed for the cubic phase with a lattice parameter a=5.684 ±0.008A. On cooling the material transforms into a hexagonal martensite phase with 3 P6 /mcmIIspace group and lattice parameters, a=6.867 ± 0.001A and c=4.772 ± 0.002A. In theFe57.4Mn35Si7.6 compound there is no structural phase transition, the system orders in a FCC unitcell with space group Fm3m and lattice parameters a=3.616 ± 0.007A. In the Fe66.7Mn26.7Si6.5case at 500K the alloy orders in a FCC unit cell with space group Fm3m and latticeparameters a=3.611 ± 0.001A. On cooling, the material transforms into a HCP cell with thespace group 3 P6 / mmc and the lattice parameters a=2.540 ± 0.002A and c=4.108 ± 0.001A. Inthe FeMnSi alloy below 69K there is the onset of an incommensurate phase down to 5K, all theFe-Mn-Si based alloys order with a type-1 FCC antiferromagnetic structure. In the case ofFeMnSi, TN=69 ± 3K and for the Fe57.4Mn35Si7.6 and Fe66.7Mn26.8Si6.5 specimens TN has beenestimated using the Brillouin J=2 function, to be TN~389 ± 10K and 315 ± 10K respectively.From neutron measurements, at 5K a magnetic moment of 2.69 ± 0.04μB per site and 2.20 ±0.05μB per site was calculated for the Fe57.4Mn35Si7.6 and Fe66.7Mn26.8Si6.5 specimensrespectively." @default.
- W144825248 created "2016-06-24" @default.
- W144825248 creator A5032820064 @default.
- W144825248 date "2010-01-01" @default.
- W144825248 modified "2023-09-26" @default.
- W144825248 title "The structure and magnetic properties of ferromagnetic shape memory alloys containing iron" @default.
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