scholarly journals Synthesis of Pd-based Tsai-type 1/1 approximants

2014 ◽  
Vol 70 (a1) ◽  
pp. C89-C89
Author(s):  
Reiko Fukami ◽  
Takanobu Hiroto ◽  
Ryuji Tamira
Keyword(s):  
Magnetic Properties ◽  
The Other ◽  
Formation Condition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Formation Conditions ◽  
Xrd Patterns ◽  
Equilibrium Phases

Recently, a new Tsai-type 1/1 approximant (AP) was discovered in the Pd-Ge-Yb system by Kashimoto et al[1]. In this alloy, the Yb valence was found to be in an intermediate state between Yb2+ and Yb3+. On the other hand, various magnetic transitions were found in other rare-earth (RE) bearing Tsai-type APs. In this work, the formation condition and magnetic property of Pd-M-RE appximants were investigated. Mother ingots of various conditions based on Pd-M-Yb[1], were prepared by arc melting followed by various heattreatment conditions to obtain homogeneous equilibrium phases. The Phase constitutions were studied by powder X-ray diffraction (XRD). The obtained XRD patterns can be indexed as 1/1 AP. The details of the formation conditions as well as magnetic properties will be presented in the poster.

Magnetic Properties of Tb(Ni0.95Fe0.05)3 Crystalline Compound and Powder

2013 ◽  
Vol 203-204 ◽  
pp. 292-295 ◽  
Author(s):  
Krzysztof Ociepka ◽  
Ania Bajorek ◽  
Artur Chrobak ◽  
Grażyna Chełkowska
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetocaloric Effect ◽  
Milling Time ◽  
Crystalline Compound ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Melting Technique ◽  
Xrd Patterns

The magnetic properties and the crystal structure of the ball-milled Tb(Ni0.95Fe0.05)3compound have been studied by using magnetization measurements and X-ray diffraction (XRD). The results were compared with those obtained for the bulk compound prepared by arc-melting technique. The investigated sample is polycrystalline and crystallizes in the rhombohedral PuNi3type of crystal structure (space group R-3m). With the increase of the time milling (i.e. 1 h, 24 h and 48 h) a for-mation of grains less than 1μm and a reduction of magnetocaloric effect have been observed. The analysis of XRD patterns for ball-milled powders shows that after 48h milling time there is still visible a crystalline structure.

scholarly journals Influence of Li2CO3 addition on electrical and magnetic properties of Ni0.6Mg0.4Fe2O4

2020 ◽  
Vol 10 (03) ◽  
pp. 2050003
Author(s):  
M. R. Hassan ◽  
M. T. Islam ◽  
M. N. I. Khan
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Low Frequency ◽  
Solid State Reaction Method ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Frequency Regime ◽  
Xrd Patterns

In this research, influence of adding Li2CO3 (at 0%, 2%, 4%, 6%) on electrical and magnetic properties of [Formula: see text][Formula: see text]Fe2O4 (with 60% Ni and 40% Mg) ferrite has been studied. The samples are prepared by solid state reaction method and sintered at 1300∘C for 6[Formula: see text]h. X-ray diffraction (XRD) patterns show the samples belong to single-phase cubic structure without any impurity phase. The magnetic properties (saturation magnetization and coercivity) of the samples have been investigated by VSM and found that the higher concentration of Li2CO3 reduces the hysteresis loss. DC resistivity increases with Li2CO3 contents whereas it decreases initially and then becomes constant at lower value with temperature which indicates that the studied samples are semiconductor. The dielectric dispersion occurs at a low-frequency regime and the loss peaks are formed in a higher frequency regime, which are due to the presence of resonance between applied frequency and hopping frequency of charge carriers. Notably, the loss peaks are shifted to the lower frequency with Li2CO3 additions.

Structure and Magnetic Properties of Nd-Co-Fe-Si-C Intermetallics

2000 ◽  
Vol 614 ◽  
Author(s):  
Monica Sorescu ◽  
A. Grabias ◽  
M. Valeanu
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Hyperfine Magnetic Field ◽  
X Ray Diffraction ◽  
Hyperfine Fields ◽  
X Ray ◽  
Arc Melting ◽  
Fe Content ◽  
Hyperfine Field Distributions ◽  
Carbon Additions

ABSTRACTIntermetallics of the type Nd2Co15−xFexSi2Cy (x=7; 9; 12 and y=0; 1) were prepared by arc melting in order to study the competing effects of Fe and Co substitutions on the magnetic hyperfine fields as well as the effects of interstitial carbon additions on the symmetry and local magnetic properties in these systems. The investigations were performed by x-ray diffraction, Mössbauer spectroscopy and hysteresis loop measurements. Both site and average hyperfine magnetic field values were analyzed in order to discriminate between the Fe and Co contributions to the local atomic environments in these systems. While a higher Fe content as well as a higher Co content can both lead to an increase in the site magnetic fields, it was found that the model based on hyperfine field distributions provides a better description of the trends observed in hyperfine magnetic fields in these compounds.

Study of the magnetic and structural properties of Al–Cr codoped Y-type hexaferrite prepared via sol–gel auto-combustion method

2015 ◽  
Vol 29 (14) ◽  
pp. 1550090 ◽  
Author(s):  
O. Mirzaee ◽  
R. Mohamady ◽  
A. Ghasemi ◽  
Y. Alizad Farzin
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Combustion Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Shape ◽  
Auto Combustion ◽  
Xrd Patterns ◽  
Cr Doping

Nanostructure of Y-type hexaferrite with composition of Sr 2 Ni 2 Al x/2 Cr x/2 Fe 12-x O 22 (where x are 0, 0.6, 1.2, 1.8, 2.4 and 3) were prepared by sol–gel auto-combustion method. The influence of Al and Cr doping on the structural and magnetic properties has been investigated. The X-ray diffraction (XRD) patterns confirm phase formation of Y-type hexaferrite. The microstructure and morphology of prepared samples were studied by high resolution field emission scanning electron microscope (FESEM) which shows the hexagonal shape for all of the samples. Magnetic properties were characterized using vibrating sample magnetometer (VSM). The magnetic results revealed that by increasing the Al and Cr to the structure, the coercivity was also increased from 840 Oe to 1160 Oe. Moreover it has been shown that with addition of dopants, saturation magnetization (Ms) and remnant magnetization (Mr) were decreased from 39.61 emu/g to 30.11 emu/g and from 17.51 emu/g to 14.62 emu/g, respectively, due to the entrance of nonmagnetic ions into Fe 3+ sites.

Hydrogenation and Magnetic Properties of Pd/Co Multilayers

1996 ◽  
Vol 458 ◽  
Author(s):  
A. Suzuki ◽  
K. Kyuno ◽  
E. Akiba ◽  
T. Manago ◽  
H. Miyajima ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Unit Volume ◽  
Unit Area ◽  
Perpendicular Magnetic Anisotropy ◽  
Anisotropy Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Crystalline ◽  
Xrd Patterns

ABSTRACTThe magnetic properties of sputtered Pd/Co multilaysers in hydrogen atmospheres were studied. The x-ray diffraction(XRD) patterns in hydrogen atmospheres showed that the lattice expansion of hydrogenated Pd decreased with decreasing thickness of Pd layers, which is reminiscent of nano-crystalline Pd. Perpendicular magnetic anisotropy(PMA) and saturation magnetization were reduced by the hydrogénation. The interface anisotropy energy per unit area, Ks, and volume anisotropy energy per unit volume, Kv are discussed. These results suggest that interface magnetic anisotropy between Pd and Co layers is suppressed by hydrogenation.

Proficient Ni-Zn-Cr Ferrites: Synthesis and Characterization

2012 ◽  
Vol 510-511 ◽  
pp. 343-347
Author(s):  
S. Nasir ◽  
M.A. Malik ◽  
G. Asghar ◽  
G.H. Tariq ◽  
M. Akram ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Ferrite ◽  
Phase Spinel ◽  
Scherrer Formula ◽  
Xrd Patterns ◽  
Cr Doping

Ni-Zn ferrite nanoparticles with Cr doping, having the general formula Ni0.5Zn0.5CrxFe2-xO4(x = 0.1, 0.3, 0.5) were prepared by simplified sol-gel method and sintered at 750±5°C. The structural and magnetic properties of the samples sintered at 750±5°C were studied. From X-ray diffraction (XRD) patterns, it was confirmed that the samples have single phase spinel structure. The crystallite size was calculated from the most intense peak (3 1 1) using the Debye Scherrer formula and was found to be in the range of 29-34 nm. The scanning electron microscope images showed that the particle size of the samples were in the range 60-120nm. Quantum design PPMS model 6700 was used to study magnetic properties of these samples. The effect of Cr doping on the magnetic properties was explained on the basis of cations distribution in the crystal structure.

scholarly journals Structure, Microstructure, and Magnetic Properties of Melt Spun Ni50Mn50−xInx Ribbons

2021 ◽  
Vol 7 (5) ◽  
pp. 63
Author(s):  
Karima Dadda ◽  
Safia Alleg ◽  
Joan Saurina ◽  
Lluïsa Escoda ◽  
Joan-Josep Suñol
Keyword(s):  
Magnetic Properties ◽  
Thermal Hysteresis ◽  
Equilibrium Temperature ◽  
Indium Content ◽  
Martensitic Transition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Xrd Patterns ◽  
Microstructure And Magnetic Properties

Structural, microstructural, and magnetic properties of Heusler Ni50Mn50−xInx (x = 5 and 10) ribbons have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetry (DSC), and vibrating sample magnetometry (VSM). The as quenched Ni50Mn45In5 ribbons exhibit a mixture of monoclinic 14M (a = 4.329(3) Å, b = 5.530(3) Å, and c = 28.916(3) Å), and tetragonal L10 (a = b = 3.533(3) Å, and c = 7.522(3) Å) martensite structures, while Ni50Mn40In10 ribbons display a single monoclinic 14M phase (a = 4.262(3) Å, b = 5.692(3) Å, and c = 29.276(3) Å). After three heating/cooling cycles, in the temperature range of 303–873 K, the Rietveld refinement of the XRD patterns revealed the presence of a single 14M martensite for Ni50Mn45In5 ribbons, and a mixture of cubic L21 (31%) and 14M (69%) phases for Ni50Mn40In10 ribbons. The characteristic temperatures of the martensitic transition (Astart, Afinish, Mstart, and Mfinish), the thermal hysteresis temperature width, and the equilibrium temperature decreased with increasing indium content and heating cycles. The samples show a paramagnetic like behavior in the as quenched state, and a ferromagnetic like behavior after the third heating/cooling cycle.

Magnetic Properties of Mg0.4Ca0.6Fe2O4 Nanoparticles Synthesized by Sol-Gel Method for Hyperthermia Treatment

2014 ◽  
Vol 631 ◽  
pp. 193-197
Author(s):  
A.M. Escamilla-Pérez ◽  
D.A. Cortés-Hernández ◽  
J.M. Almanza-Robles ◽  
D. Mantovani ◽  
P. Chevallier
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Hyperthermia Treatment ◽  
X Ray ◽  
Transmission Electron ◽  
Heat Treated ◽  
Different Temperatures ◽  
Xrd Patterns

Powders of Mg0.4Ca0.6Fe2O4were prepared by sol-gel using ethylene glycol and Mg, Ca and Fe nitrates as starting materials. Those powders were heat treated at different temperatures (300, 400, 500 and 600 °C) for 30 min. The materials obtained were characterized by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). The Ca-Mg ferrite with the most appropriate magnetic properties was further analyzed by transmission electron microscopy (TEM). The heating capability of the nanoferrites was also tested via magnetic induction. The XRD patterns of these Ca-Mg ferrites showed a cubic inverse spinel structure. Furthermore, neither traces of hematite nor orthorhombic Ca ferrite phases were detected. Moreover, all the Ca-Mg ferrites are superparamagnetic and the particle size distribution of these Ca-Mg magnetic nanoparticles exhibits an average diameter within the range of 10-14 nm. The needed temperature for hyperthermia treatment was achieved at around 12 min.

Magnetic Properties of Nd3Fe27.7-xNixTi1.3 Compounds

2018 ◽  
Vol 271 ◽  
pp. 112-118
Author(s):  
Jun Ning ◽  
Gerile Mandahu ◽  
Kai Li ◽  
Hasi Chaolu ◽  
Ojin Tegus ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Anisotropy Constant ◽  
Magnetization Measurement ◽  
Spin Reorientation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Ni Content ◽  
Diffraction Patterns ◽  
Magnetically Aligned

The structure and magnetic properties of the Nd3Fe27.7-xNixTi1.3compounds prepared by arc-melting method have been investigated by means of X-ray diffraction and magnetization measurement. It was found that all the compounds crystallized in Nd3(Fe, Ti)29-type structure with monoclinic symmetry and A2/m space group in concentration range 0.2 ≤x≤ 1.2. The unit cell volume decreased slightly with increasing Ni content. The X-ray diffraction patterns of the magnetically aligned samples showed that all compounds investigated had planar anisotropy. The Spin reorientation phenomena occurred in all the compounds. As the increase of Ni content, the Curie temperature TCmonotonously increased, but the spin reorientation temperature Tsrdid not obviously change. The saturation magnetization Ms of the compounds decreased monotonously with increasing Ni content at 5 K, 105 K, 205 K, and 305 K. The anisotropy fields Baat 5 K, 305 K and anisotropy constant K2at 305K appeared as a minimum, but the anisotropy constant K1at 305 K appeared as a maximum onx= 0.6.

Synthesis and magnetic properties of the extended RE4Pd9Al24 series (RE = Sc, Y, Ce–Nd, Sm, Gd–Lu)

2020 ◽  
Vol 75 (6-7) ◽  
pp. 633-641
Author(s):  
Mathis Radzieowski ◽  
Judith Bönnighausen ◽  
Oliver Janka
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
Phase Purity ◽  
X Ray ◽  
Arc Melting ◽  
Subgroup Scheme ◽  
Low Dimensional ◽  
Broad Feature

AbstractThe existing RE4Pd9Al24 series (triclinic, space group P$\overline{1}$) with RE = Gd–Tm has been extended to the rare earth elements Sc, Y, Ce–Nd, Sm, Yb and Lu. The samples were synthesized from the elements via arc-melting followed by annealing. Phase-purity was checked by powder X-ray diffraction experiments, which were also utilized to refine the lattice parameters. The structure can be described as composed of layers with a stacking of [PtAl2] (A) and [RE2Al3] (B) slabs in an ABAAB sequence. As two different structure types (P$\overline{1}$ and R$\overline{3}$m) have been reported for this composition, a group-subgroup scheme using the Bärnighausen formalism has been established in order to link the two. The magnetic properties of the X-ray-pure samples were investigated by susceptibility and magnetization measurements. Gd4Pd9Al24 shows the highest transition temperature to antiferromagnetism of TN = 22.0(1) K, however, a broad feature is observed. This is in line with a low-dimensional ordering caused by the layer-like structure and the flat honeycomb arrangement of the Gd atoms.

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