Magnetic Properties and Magnetostriction of ZnxNi1-x MnSb Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 1715-1718
Author(s):  
S.K. Ren ◽  
G.B. Ji ◽  
Song Ling Huang ◽  
Q.Q. Cao ◽  
Feng Ming Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Structural Phase ◽  
Solid State Reaction Method ◽  
Experimental Result ◽  
Xrd Pattern ◽  
Zn Concentration ◽  
Magnetostriction Coefficient ◽  
The Relationship ◽  
Curie Temperature Tc

We have investigated the magnetic properties and magnetostriction of ZnxNi1-xMnSb compounds prepared by solid state reaction method. It is found that for x less than 0.6 the magnetization of ZnxNi1-xMnSb almost remains unchanged. However, when x is larger than 0.6 the magnetization starts to drop linearly. Experimental result indicates that at low Zn concentrations, x < 0.7, the Curie temperature (TC) decreases with increasing Zn concentration x. However, when x > 0.7, the Curie temperature increases distinctly with increasing x. The Zn concentrartion dependence of magnetostrictive ceofficient is also studied. The experimental curve shows that when x < 0.6 the value of magnetostriction coefficient for ZnxNi1-xMnSb decreases linearly with the increasing Zn concentration x. However, when x is above 0.6, the magnetostrictive ceofficient raises distinctly. By analyzing the XRD pattern, the structures of the materials are examined and the relationship between the properties and the structures are discussed. A structural phase transition is observed. It has been indicated that the structure plays an important role in the magnetic and magnetostrictive properties of the system.

Study of Structural and Magnetic Properties of Spinel Zn Doped Cobalt Ferrites

2020 ◽  
Vol 310 ◽  
pp. 124-133
Author(s):  
B. Chun Feng ◽  
Ojiyed Tegus ◽  
T. Ochirkhyag ◽  
Dorj Odkhuu ◽  
Namsrai Tsogbadrakh ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Solid State Reaction Method ◽  
Element Analysis ◽  
X Ray ◽  
Cobalt Ferrites ◽  
Zn Concentration ◽  
Powder Samples

Herein, the spinel Co1-xZnxFe2O4 (x = 0.0, 0.2, 0.4 and 0.6) powder samples have been prepared by the solid-state reaction method. We have carried out the measurements of crystal structure, element analysis, material characterization, magnetic property and Curie temperature using the X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer, and the first-principles calculations within the framework of the density functional theory (DFT). The EDS measurement indicates that the Co1-xZnxFe2O4 powder samples have been successfully synthesized and exhibited the cubic spinel structures. Both the lattice constant and crystallite size increase with the Zn concentration due to the larger ionic radius of Zn2+ ion than the Co2+ ion. The concentration ratio of the Co2+ and Co3+ ions can be predicted by the distribution of cations between the A and B sites by the XPS measurement. For the magnetic properties, the residual magnetization, coercivity and Curie temperature decrease monotonically as the Zn concentration increases, while the saturation magnetization initially increases and then decreases at the room temperature. For the Co0.8Zn0.2Fe2O4 sample, the magnetic saturation reaches the maximum value of 62.98 Am2kg-1, due to a large amount of the Co3+ ions. The adequate replacement of Zn ion for the Co site can improve the magnetic properties of spinel Co1-xZnxFe2O4 powders, and effectively regulates the Curie temperature.

scholarly journals Fabrication and Magnetic Properties of Mn1 - xZnxFe2O4 (0 ≤ x ≤ 0.8) Nanoparticles

2009 ◽  
Vol 19 (1) ◽  
pp. 19-25
Author(s):  
Pham Hoai Linh ◽  
Tran Dang Thanh ◽  
Do Hung Manh ◽  
Nguyen Chi Thuan ◽  
Le Van Hong ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Biomedical Applications ◽  
Spinel Ferrite ◽  
Average Particle Size ◽  
Precipitation Method ◽  
Average Particle ◽  
Promising Candidate ◽  
Zn Concentration ◽  
Co Precipitation ◽  
Curie Temperature Tc

In this paper, we report results on the fabrication and magnetic properties of spinel ferrite Mn1-xZnxFe2O4 (0 ≤ x ≤ 0.8) nanoparticles. The nanoparticles were synthesized by a co-precipitation method. The effects of substituting Zn for Mn on the magnetic properties and particles size were focused. It was found that the phase-formation temperature is 90OC and the average particle size decreases from 40 nm to 10 nm when increased Zn concentration from zero to 0.8. The Curie temperature TC strongly decreases from 585 K (x = 0) to 320 K (x = 0.8) concomitantly with a decrease of the saturation magnetization MS. With a TC of 320 K and MS of 17 emu/g, the x=0.8 sample could be a promising candidate for some biomedical applications.

scholarly journals Effects of temperature and concentration of La in the form of A1 transverse optical phonon in the PbTiO3 system

Cerâmica ◽  
2012 ◽  
Vol 58 (347) ◽  
pp. 313-316 ◽  
Author(s):  
M. R. Joya ◽  
J. J. Barba-O ◽  
P. S. Pizani
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
High Temperatures ◽  
Wide Temperature Range ◽  
Lead Titanate ◽  
Vibrational Mode ◽  
Structural Phase ◽  
Anomalous Behavior ◽  
Effects Of Temperature ◽  
Curie Temperature Tc

The structural phase transition from ferroelectric to paraelectric was studied by Raman scattering in the ceramic lead titanate (PbTiO3) doped with lanthanum (La). A1 vibrational mode contains some sub-peaks that have been associated in literature with PbTiO3 concentration (Ca, Ba), and effects of high temperatures as it approaches the Curie temperature (Tc). Raman new study shows that the anomalous behavior of the A1 mode is not only caused by the effects of concentration or temperature near Tc, but by anharmonicity and defects in the network in the PbTiO3 thermodynamically are inevitable. This effect was studied by a wide temperature range from 10 K to Tc in each sample (La = 0, 5, 10, 15, 20%), showing that the effect depends not only on the high temperatures in the pure PT.

scholarly journals Structure and Magnetic Properties of Gd/Ti Nanoscale Multilayers

2010 ◽  
Vol 168-169 ◽  
pp. 281-284 ◽  
Author(s):  
Andrey V. Svalov ◽  
V.O. Vas’kovskiy ◽  
José M. Barandiarán ◽  
K.G. Balymov ◽  
A.N. Sorokin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Size Effect ◽  
Layer Thickness ◽  
Rf Sputtering ◽  
Finite Size ◽  
Amorphous State ◽  
Finite Size Effect ◽  
Structure Transformation ◽  
Curie Temperature Tc

Structure and magnetic properties of nanoscale [Gd/Ti]n multilayers prepared by rf-sputtering are studied. It is found that the decrease in the Gd layer thickness LGd leads to beginning of the structure transformation in Gd layers from the fine-crystalline to amorphous state when LGd becomes less than 2 nm. The Curie temperature TC decreases as a function of the Gd layer thickness in the same way as in early studied epitaxially grown Gd films, i.e. in case for which the finite-size effect plays most important role. A deviation of the TC(LGd) behaviour at very low LGd from the fit according to the finite-size law is probably caused by the island-like structure of the Gd layers.

scholarly journals Tuning the Room Temperature Ferromagnetism in Fe5GeTe2 by Arsenic Substitution

2D Materials ◽  
2021 ◽  
Author(s):  
Andrew May ◽  
Jiaqiang Yan ◽  
Raphael Hermann ◽  
Mao-Hua Du ◽  
Michael A McGuire
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Fine Tuning ◽  
The Individual ◽  
Curie Temperature Tc ◽  
Antiferromagnetic Behavior ◽  
Magnetic Sublattices

Abstract In order to tune the magnetic properties of the cleavable high-Curie temperature ferromagnet Fe5-xGeTe2, the effect of increasing the electron count through arsenic substitution has been investigated. Small additions of arsenic (2.5 and 5%) seemingly enhance ferromagnetic order in polycrystalline samples by quenching fluctuations on one of the three magnetic sublattices, whereas larger As concentrations decrease the ferromagnetic Curie temperature (TC) and saturation magnetization. This work also describes the growth and characterization of Fe4.8AsTe2 single crystals that are structurally analogous to Fe5-xGeTe2 but with some phase stability complications. Magnetization measurements reveal dominant antiferromagnetic behavior in Fe4.8AsTe2 with a Neel temperature of TN ≈42K. A field-induced spin-flop below TN results in a switch from negative to positive magnetoresistance, with significant hysteresis causing butterfly-shaped resistance loops. In addition to reporting the properties of Fe4.8GeTe2, this work shows the importance of manipulating the individual magnetic sublattices in Fe5-xGeTe2 and motivates further efforts to control the magnetic properties in related materials by fine tuning of the Fermi energy or crystal chemistry.

Spin State and Magnetic Properties of Nd1-xSrxCoO3 (0.1≤x≤0.5)

2013 ◽  
Vol 785-786 ◽  
pp. 676-679
Author(s):  
Yi Yun Yang
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Spin State ◽  
State Transition ◽  
Solid State Reaction Method ◽  
Experimental Result ◽  
Conventional Solid State Reaction ◽  
Reaction Method ◽  
Spin State Transition ◽  
Intermediate Spin

In this paper, the rare earth cobaltite Nd1-xSrxCoO3 (0.1≤x≤0.5) samples were prepared using conventional solid state reaction method. Magnetization and spin state of cobalt of sample were systematically investigated. The experimental result suggests that magnetization and the Curie temperature increase sharply with increasing Sr content. The Curie-Weiss fit shows that most of the Co3+ ions are in the intermediate spin state and the Co4+ ions are in low spin for x=0.5. Furthermore, our study confirms that spin-state transition take place in Nd1-xSrxCoO3.

scholarly journals Ferroelectric Transition in Sr- and W-Doped BaTiO3 Solid Solutions

2021 ◽  
Vol 11 (15) ◽  
pp. 6760
Author(s):  
Heeju Ahn ◽  
Eunjeong Lee ◽  
Yujin Cho ◽  
Dongyeon Bae ◽  
Hee Jung Park ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Curie Temperature ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Lattice Constants ◽  
A Value ◽  
Curie Temperature Tc

We synthesized Sr- and W-doped BaTiO3 (BTO) polycrystals by using a solid-state reaction method. The X-ray diffraction results showed that Sr and W atoms occupied the Ba and Ti sites in tetragonal BTO, respectively, and there were changes in the lattice constants and the volumes in the Sr- and W-doped BTO. We found a change in the latent heat and the Curie temperature (TC) during the transition between the ferroelectric and paraelectric phases while increasing the contents of Sr and W in the Sr- and W-doped BTO. This can be explained by the fact that the doping of Sr and W atoms in BTO prevented a distinct transition between the ferroelectric tetragonal and paraelectric cubic structures by decreasing the c/a ratio to a value close to unity. This study shows a way toward a strategy for modulating a crystal structure by using proper dopants for future applications in ferroelectricity-based devices.

scholarly journals Microstructure and magnetic properties of soft nickel ferrite

2015 ◽  
Vol 39 (1) ◽  
pp. 59-64 ◽  
Author(s):  
Mahabub Alam Bhuiyan ◽  
Sheikh Manjura Hoque ◽  
Shamima Choudhury
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Sintering Temperature ◽  
Great Influence ◽  
Complex Permeability ◽  
Scanning Electron Micrographs ◽  
Academy Of Sciences ◽  
Curie Temperature Tc ◽  
Microstructure And Magnetic Properties

Polycrystalline NiFe2O4 samples were prepared from analytical grade powder of NiO and Fe2O3 by conventional double sintering technique. The samples were sintered at 1000 - 1400°C. The scanning electron micrographs (magnification ´ 10000) of the samples revealed that the grain size increases and the porosity decreases with the increase in sintering temperature. These changes in microstructure, grain size and porosity with sintering temperature have great influence on the magnetic properties of NiFe2O4. Complex permeability (u’) over the frequency range from 1 kHz to 13 MHz for the samples at different sintering temperatures (1000-1400°C) has been observed. Variation of permeability with the applied temperature has been observed at various sintering temperature from which Curie temperature have been calculated. Decreased value of Curie temperature (Tc) has been found with the increase of sintering temperature.Journal of Bangladesh Academy of Sciences, Vol. 39, No. 1, 59-64, 2015

Electronic Structure and Magnetic Properties of Nd5Fe17

1999 ◽  
Vol 577 ◽  
Author(s):  
R. F. Sabiryanov ◽  
S. S. Jaswal
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Curie Temperature ◽  
Magnetic Moments ◽  
Mean Field ◽  
Local Environment ◽  
Field Approximation ◽  
Experimental Result ◽  
Mean Field Approximation ◽  
Orbital Method

ABSTRACTThe Nd5Fel compound has attracted some attention lately as a possible permanent-magnet material. This compound has a very complicated crystal structure (264 atoms per unit cell with 14 and 7 different Fe and Nd sites respectively!) Using linear-muffin-tin-orbital method, self-consistent spin-polarized studies of NdFe1 - have been carried out to determine the electronic structure, magnetic moments, and the Curie temperature. The results show strong effect of the local environment on the magnetic properties of individual Fe sites. The calculated moments are compared with the magnetization data. The Curie temperature estimated for the iron sublattice using the mean-field approximation is in a reasonable agreement with the experimental result.

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