scholarly journals Magnetic properties of natural pyrrhotite Part I: Behaviour of initial susceptibility and saturation-magnetization-related rock-magnetic parameters in a grain-size dependent framework

1988 ◽  
Vol 52 (3-4) ◽  
pp. 376-393 ◽  
Author(s):  
M.J. Dekkers
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Magnetic Parameters ◽  
Initial Susceptibility ◽  
Size Dependent

Research on Effects of Mo Element on the Magnetic Properties of 1J79 Alloy

2010 ◽  
Vol 160-162 ◽  
pp. 1787-1790
Author(s):  
Jing Cao ◽  
Yong Feng Wang ◽  
Chun Xue Wei
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Crystal Growth ◽  
Saturation Magnetization ◽  
Electron Probe ◽  
Electric Arc ◽  
Experimental Results ◽  
Vibrating Sample Magnetometer ◽  
Electron Probe Microanalyzer ◽  
Mo Content

1J79 alloy was prepared by vacuum electric arc smelting．The crystal growth and the content of impurity was observed by electron probe microanalyzer，and magnetic properties were measured by vibrating sample magnetometer(VSM)．Experimental results show that inclusions in the alloy are fewer and fewer, composition becomes more uniform with the increases of the Mo content, and grain size also becomes larger and larger with the increases of Mo content, to reduce coercivity. The small amount of Mo addition is useful to improve the saturation magnetization and reduce coercivity．

A Novel Type of Magnetic Fe2O3/Fe3O4 Heterogeneous Microparticles Prepared via the Ethanol-Water Reflux and Rapid Combustion Process

2020 ◽  
Vol 20 (5) ◽  
pp. 2998-3003
Author(s):  
Jia Liu ◽  
Zhou Wang ◽  
Yanyan Wang
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Calcination Temperature ◽  
Ethyl Alcohol ◽  
Combustion Process ◽  
Key Factors ◽  
Absolute Ethyl Alcohol ◽  
Grain Sizes ◽  
Rapid Combustion

A novel type of magnetic Fe2O3/Fe3O4 heterogeneous microparticles with ellipsoidal macropores was prepared via the ethanol-water reflux and rapid combustion process. The experimental results showed that the volume of absolute ethyl alcohol and the calcination temperature were the key factors to the grain sizes and the magnetic properties, the calcination temperature largely affected the saturation magnetization and the grain size of Fe2O3/Fe3O4 heterogeneous microparticles, and the amount of absolute ethyl alcohol also tremendously affected the saturation magnetization, however, the amount of absolute ethyl alcohol affected little on the grain size. Fe2O3/Fe3O4 heterogeneous microparticles calcined at 200 °C for 1 h with absolute ethyl alcohol of 20 mL had the largest saturation magnetization of 90.1 Am2/kg.

MAGNETIC PROPERTIES OF Ni NANOPARTICLES

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4390-4394 ◽  
Author(s):  
Y. T. JEON ◽  
J. Y. MOON ◽  
G. H. LEE ◽  
J. PARK
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Magnetic Moments ◽  
Particle Diameter ◽  
Average Particle ◽  
Ni Nanoparticles ◽  
Size Dependent

We investigated the size dependent magnetic properties of Ni nanoparticles. We prepared four samples with average particle diameters of 7.0, 14.0, 16.5, and 20.0 nm. The blocking temperatures (TBs) were 40.0, 150.0, 250.0, and ~ 300.0 K for the above Ni nanoparticles, respectively. Saturation magnetization increased with increasing particle diameter due to the reduced magnetic moments of surface atoms. The coercivities at 5 K ranged from 270 and 340 Oe, whereas those at 300 K were zero due to superparamagnetism.

Grain Size Dependent Magnetic Properties of Nanocrystalline Sm [BE]Co [BD][BJ]/Cu

2001 ◽  
Vol 703 ◽  
Author(s):  
L. Bessais ◽  
C. Djéga-Mariadassou ◽  
J. Zhang ◽  
V. Lalanne ◽  
A. Percheron-Guégan
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Rietveld Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Transmission Electron ◽  
Average Grain Size ◽  
Magnetic Metal ◽  
Chemical Distribution

ABSTRACTThe evolution of both micro structural and magnetic properties of the Sm[BE]Co[BD][BJ] Cu powder, is studied as a function of soft co-milling time. The average grain size in the range 20 - 50 nm was determined by transmission electron microscopy coupled with x-ray diffraction using the Rietveld method. The particle shape and chemical distribution were investigated by elemental mapping, using wavelength dispersive x-ray analysis with electron microprobe analysis. The coercivity evolution shows that an optimum value of 6 kOe is obtained after 5 h co-milling. The microstructure analysis indicates that both materials are well mixed in nanometer scale. This technique appears as a potential route to synthesize nanocrystalline Sm[BE]Co[BD][BJ] isolated by non-magnetic metal Cu.

Structure and magnetic properties of hydrides based on Uranium bcc alloys

2014 ◽  
Vol 1683 ◽  
Author(s):  
Ladislav Havela ◽  
Mykhaylo Paukov ◽  
Ilya Tkach ◽  
Zdenek Matej ◽  
N.-T.H. Kim-Ngan ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
High Pressures ◽  
Magnetic Moments ◽  
Amorphous Structure ◽  
Magnetic Parameters ◽  
Cubic Structure

ABSTRACTγ-U alloys with Mo or Zr are more resistant to hydrogen than U metal. High pressures of H are needed to produce hydrides. Amorphous structure of UH3Mox can be represented as the cubic structure of β-UH3 type with grain size around 1 nm. UH3Zrx are formed in the cubic α-UH3 type of structure. All the hydrides are ferromagnets, with magnetic parameters (magnetic moments, Curie temperature) exceeding those of β-UH3 (0.9 μB/U, 165-170 K). It is deduced that α-UH3 has magnetic properties very similar to β-UH3, despite rather different U-U spacing.

Grain-size-dependent magnetic properties of nanocrystalline Gd

2006 ◽  
Vol 73 (5) ◽  
Author(s):  
R. Kruk ◽  
M. Ghafari ◽  
H. Hahn ◽  
D. Michels ◽  
R. Birringer ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Size Dependent

GRAIN SIZE DEPENDENT DIELECTRIC AND MAGNETIC PROPERTIES OF (Y) NCCF+(1 – Y) BTO PARTICULATE COMPOSITES

2012 ◽  
Vol 11 (03) ◽  
pp. 1240007 ◽  
Author(s):  
P. B. BELAVI ◽  
G. N. CHAVAN ◽  
L. R. NAIK ◽  
R. K. KOTNALA
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Small Polaron ◽  
Low Frequency ◽  
Frequency Region ◽  
Particulate Composites ◽  
X Ray Diffraction ◽  
High Frequency Region ◽  
Size Dependent ◽  
Average Grain Size

The particulate composites with general formula (y) Ni 0.85 Cd 0.1 Cu 0.05 Fe 2 O 4 + (1 - y) BaTiO 3, (0.0 < y < 1.0) were synthesized by conventional double sintering ceramic technique. The formation of cubic spinel structure in ferrite phase and tetragonal perovskite structure in ferroelectric phase was confirmed by X-ray diffraction (XRD) measurements. The surface morphology with average grain size of the composites was studied by SEM measurements. The study of variation of dielectric constant with frequency (20 Hz to 1 MHz) shows dielectric dispersion behavior in the low frequency region and almost constant at high frequency region. The linear variation in a.c conductivity with frequency shows small polaron type of conduction mechanism in the composites. The vibrating sample magnetometer (VSM) was used to study the magnetic properties such as saturation magnetization and magnetic moment.

Influence of Grain Size on Magnetic Properties of Electroplated NiFe

2006 ◽  
Vol 326-328 ◽  
pp. 381-384 ◽  
Author(s):  
Marita Yusrini ◽  
Idris Yaacob Iskandar
Keyword(s):  
Magnetic Field ◽  
Grain Size ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Applied Magnetic Field ◽  
Size Variation ◽  
Nanocrystalline Alloys ◽  
Electrodeposition Technique ◽  
Nickel Iron ◽  
Grain Sizes

Nickel-Iron nanocrystalline alloys with different grain sizes were fabricated by electrodeposition technique. In this study, influence of the grain size nanocrystalline NiFe deposits on saturation magnetization Ms and coercivity Hc was investigated. Alternating gradient magnetometer (AGM) with up to 10 kOe applied magnetic field was used to study the magnetic properties of NiFe film. The results showed that saturation magnetization Ms and coercivity Hc were affected by grain size variation. Increase in grain size increased the saturation magnetization. The largest grain size of 18.6 nm showed the highest Ms of 138 emu/g, while the smallest grain size of 7.2 nm showed Ms of 94 emu/g. Minimum coercivity of 3.847 Oe was observed for sample with 7.2 nm grain sizes. The coercivities decreased for smaller grain sizes.

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