Martensitic Transformation, Thermal Analysis and Magnetocaloric Properties of Ni-Mn-Sn-Pd Alloys

Wederni, Asma; Ipatov, M.; Pineda, Eloi; Escoda, L.; Gonzalez, J.R.H.; Khitouni, Mohamed; Suñol, J.J.

doi:10.3390/pr8121582

Cited by 15 publications

(15 citation statements)

References 42 publications

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“…The (111) and (200) superlattice reflections are clearly observed at 2Ө = 27.67 0 and 32 0 positions in the XRD diffractogram for GCMW-A, i.e., ρ = 0.3. As described in our previous publications [15,17,32], such XRD diffractogram is attributed to a fully ordered cubic L2 1 austenitic structure. Nevertheless, these two superlattices' diffraction (111) and (200) peaks are significantly weaker as compared to other superlattices' peaks belonging to the same diffractogram.…”

Section: Sample D (µM) D (µM) Aspect Ratio (ρ) Chemical Compositionsupporting

confidence: 67%

“…Other synthesized techniques, like melt spinning or atomization, can also be used to obtain the L2 1 phase in Heusler alloys via rapid solidification. These procedures consist of quenching the molten alloy at a high cooling rate to eliminate the formation of other phases and promote the formation of the ordered one [14][15][16][17]. Otherwise, the formation of nanocrystalline powder alloys can lead to reaching the fully ordered L2 1 structure.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Geometrical Aspect Ratio on the Magneto-Structural Properties of Co2MnSi Microwires

Wederni,

Salaheldeen,

Ipatov

et al. 2023

Metals

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This present study illustrates the strong effect of geometrical parameters on the magneto-structural properties of Co2MnSi glass-coated microwires prepared using the Taylor–Ulitovsky method. Thus, there are three samples with different geometrical aspect ratios (ρ). The XRD analysis shows a significant change by modifying the aspect ratio; for ρ = 0.42, the main peak with miller indices (220) is recognized as an A2-type disordered cubic structure. For the sample with ρ = 0.46, mixed L21 and B2 cubic structures are observed. Meanwhile, in the sample with a low aspect ratio, ρ = 0.30, the perfect L21 ordered cubic structure is attained. Magnetic characterization has been carried out at a wide range of temperatures and magnetic fields. A significant increase in coercivity and normalized reduced remanence by decreasing the aspect ratio is detected. The change in the magnetic properties is attributed to the modification in the microstructure, which is induced during the fabrication process. Such a dependence on the microstructure and magnetic properties on the ρ-ratio can be associated either with the internal stress distribution and magnitude or with different quenching rates of microwires with different aspect ratios. The current findings demonstrate the tunability of the microstructure and magnetic properties of Co2MnSi-glass-coated microwires simply via a small modification in the geometric properties during the manufacturing process and without excreting any additional post-processing. The variation in the geometric parameters of Co2MnSi glass-coated microwires allows us to tune the magnetic properties and structure, which is essentially advantageous for sensing device development.

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Section: Sample D (µM) D (µM) Aspect Ratio (ρ) Chemical Compositionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Influence of the Geometrical Aspect Ratio on the Magneto-Structural Properties of Co2MnSi Microwires

Wederni,

Salaheldeen,

Ipatov

et al. 2023

Metals

Self Cite

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“…It is well noting that, the theoretical calculations anticipated that the B2 type disorder structure produced in Y-Z elements has a far smaller impact on the spin polarization values than the X-Y disorder and X-Y-Z disorder, both of which noticeably diminish this feature [5]. The presence of (111) and ( 200) and (311) super lattice diffraction peaks confirm the presence of high ordered of L21 structure [28]. The estimated lattice parameter and calculated volume of the cell are a = 5.7430 Å and V = 189.42 Å 3 , respectively, which perfectly matched with the lattice parameter and Volume values reported elsewhere [9,29] for Co2MnGe thin films.…”

Section: Edx Spectrummentioning

confidence: 82%

Preparation and Magneto-Structural Investigation of High Ordered (L21 Structure) Co2MnGe Microwires

Salaheldeen¹,

Wederni²,

Ipatov³

et al. 2023

Preprint

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We used the Taylor-Ulitovsky Technique to prepare nanocrystalline Co2MnGe Heusler alloy glass-coated microwires with a metallic nucleus diameter of 18 ± 0.1 µm and a total diameter of 27.2 ± 0.1 µm. Magnetic and structural studies were carried out to determine the fundamental magneto-structural characteristics of Co2MnGe glass-coated microwires. XRD revealed a well-defined nanocrystalline structure with average grain size about 63 nm, lattice parameter a = 5.62 and a unique mixture of L21 and B2 phases. The magnetization curves for field cooling and field heating (FC-FH) demonstrate a considerable dependence on the applied magnetic field, ranging from 50 Oe to 20 kOe. Internal stresses, originated by the production process, resulted in various magnetic phases, which were responsible for the notable difference of field cooling (FC) and field heating (FH) curves on magnetization dependence versus temperature. Furthermore, the ferromagnetic behavior and expected high Curie temperature together with high degree of L21 ordered makes it a promising candidate for many applications.

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“…Mostly, austenite to martensite undergoes a solid-solid transformation, displaying a first order structural transformation and lead to a homogeneous deformation of the structure mainly made by distortion [37]. This transition is able to be displacive because it is diffusion less (without displacement of sets of atoms).…”

Section: Edx Spectrummentioning

confidence: 99%

Elucidation of the Strong Effect of the Annealing and the Magnetic Field on the Magnetic Properties of Ni2-based Heusler Microwires

Salaheldeen¹,

Wederni²,

Ipatov³

et al. 2022

Preprint

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We studied the effect of annealing and the applied magnetic field from 50 Oe to 20 kOe on the magneto-structural behavior of Ni2FeSi-based Heusler microwires fabricated by using Taylor-Ulitovsky technique. Using the XRD analysis, a strong effect of annealing, manifested as the development of the crystallization process, was observed. The average grain size and crystalline phase content of annealed sample increase from 21.3 nm and 34 % to 32.8 nm and 79%, respectively, as-compared to the as-prepared one. In addition, upon annealing phase transforms into a monoclinic martensitic structure with modulation 10M were observed, which cannot be found in the as-prepared sample. Concerning the magnetic properties, both samples show ferromagnetic behavior below and above the room temperature, where the Curie temperature of Ni2FeSi is higher than room temperature. The induced secondary phases have a noticeable effect on the magnetic behavior of the annealed sample, where a high normalized saturation magnetization (NMs) and low normalized reduced remenance (Mr = M/M5K), compared to the as- prepared have been detected. Additionally, the coercivity of annealed sample shows one flipping point at 155 K where it behavior with temperature is changed. Meanwhile, the as-prepared sample show two flipped point at 205 K and 55 K. A mismatch between field cooling (FC) and field heating (FH) magnetization curves with temperature has been detected for annealed sample at low applied magnetic field. In addition the FC and FH curves shows different slopes with variation the temperature and the magnetic field. By increasing the external magnetic field higher than 200 Oe and up to 20 kOe a gradual changing in the magnetic behavior has been detected, where the mismatch and different slopes disappeared at applying magnetic field about 20 kOe. The difference in magnetic and structure behavior of Ni2FeSi microwires sample is discussed considering the effect of induced internal stresses by the presence of a glass coating and the recrystallization and stresses relaxation upon annealing.

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Martensitic Transformation, Thermal Analysis and Magnetocaloric Properties of Ni-Mn-Sn-Pd Alloys

Cited by 15 publications

References 42 publications

Influence of the Geometrical Aspect Ratio on the Magneto-Structural Properties of Co2MnSi Microwires

Influence of the Geometrical Aspect Ratio on the Magneto-Structural Properties of Co2MnSi Microwires

Preparation and Magneto-Structural Investigation of High Ordered (<em>L2<sub>1</sub></em> Structure) Co2MnGe Microwires

Elucidation of the Strong Effect of the Annealing and the Magnetic Field on the Magnetic Properties of Ni<sub>2</sub>-based Heusler Microwires

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