Modification of the Structure and Magnetic Properties of Al2O3/Co(P) Composite Particles during Mechanical Activation

2018 ◽  
Keyword(s):  
Magnetic Properties ◽  
Mechanical Activation ◽  
Composite Particles

scholarly journals Preparation and Characterization of Magnetic Chitosan Microcapsules

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaopeng Xiong ◽  
Yong Wang ◽  
Weiwei Zou ◽  
Jiangjiang Duan ◽  
Yun Chen
Keyword(s):  
Magnetic Properties ◽  
Strong Interaction ◽  
Liquid Paraffin ◽  
Hollow Microspheres ◽  
Composite Particles ◽  
Cross Link ◽  
Magnetic Chitosan ◽  
Starting Solution ◽  
Dense Shell

By dispersing aqueous precipitant in liquid paraffin to prepare a W/O emulsion then adding chitosan (CS) solution, CS microcapsules have been successfully prepared. It is a facile way to prepare polymer microcapsules by using aqueous precipitant or nonsolvent as template, which avoids the removal of template and would free from the necessity to cross-link the microcapsule as usual methods to directly form dense shell. The hollow feature of the obtained materials is revealed. The diameter of the microcapsules ranges from severalμm to over 100 μm. Magnetic CS microcapsules have been prepared in this way when Fe3+and Fe2+were mixed with CS to prepare a mixture starting solution. The appearance and microstructure of the composite microcapsules were studied. The results indicate that the formed Fe3O4nanoparticles are embedded in the CS matrix evenly due to strong interaction between the Fe3O4nanoparticles and the CS molecules. The Fe3O4content and the magnetic properties of the composite microcapsule were measured. The composite microcapsules were calcined in air at 700°C to prepare pure inorganic hollow microspheres. It is general to prepare hollow polymeric or composite particles by using this method.

scholarly journals Influence of mechanical activation and heat treatment on magnetic properties of nanostructured mixture Ni85.8Fe10.6Cu2.2W1.4

2019 ◽  
Vol 55 (1) ◽  
pp. 85-93 ◽  
Author(s):  
M.M. Vasic ◽  
A.S. Kalezic-Glisovic ◽  
R. Milincic ◽  
Lj. Radovic ◽  
D.M. Minic ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Thermal Treatment ◽  
Mechanical Activation ◽  
Powder Mixture ◽  
Structural Characteristics ◽  
Volume Density ◽  
Magnetic Domains ◽  
Microstructural Changes ◽  
Mass Magnetization ◽  
Stress Relieving

The mechanical activation of the Ni85.8Fe10.6Cu2.2W1.4 powder mixture in the time intervals of 30-210 min in combination with thermal treatment at 393-873 K resulted in microstructural changes, forming the nanostructured mixture of the same composition but improved magnetic properties. The best result were achieved for mechanical activation during 120 min and thermal treatment at temperatures close to the Curie temperature (693K), enhancing the mass magnetization of the starting powder mixture by about 57%. The microstructural changes, which include the structural relaxation, decrease in free volume, density of dislocation and microstrain, improve structural characteristics of material, enabling better mobility of walls of magnetic domains and their better orientation in applied magnetic field and consequently enabling better mass magnetization of the material. With longer time of milling, the growing stress introduced in the sample undergoes easier relief, relocating stress-relieving processes toward lower temperatures.

Mössbauer Study of the Effect of Mechanical Activation on the Magnetic Properties of PbFe0.5Nb0.5O3

2017 ◽  
pp. 155-165
Author(s):  
S. P. Kubrin ◽  
I. P. Raevski ◽  
V. V. Stashenko ◽  
A. A. Gusev ◽  
V. P. Isupov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Mechanical Activation ◽  
Mössbauer Study

Influence of Y doping on structural, vibrational, optical and magnetic properties of BiFeO 3 ceramics prepared by Mechanical Activation

2017 ◽  
Vol 43 (5) ◽  
pp. 4139-4150 ◽  
Author(s):  
H. Fki ◽  
M. Koubaa ◽  
L. Sicard ◽  
W. Cheikhrouhou-Koubaa ◽  
A. Cheikhrouhou ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Mechanical Activation ◽  
Optical And Magnetic Properties

The structure and magnetic properties of Ag–Ni–SiO2 nano-composite particles produced by pulsed laser control synthesis

2015 ◽  
Vol 2 (1) ◽  
pp. 015018 ◽  
Author(s):  
Suiyuan Chen ◽  
Ting Wang ◽  
Yunjie Li ◽  
Jing Liang ◽  
Dan Wellburn ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Pulsed Laser ◽  
Control Synthesis ◽  
Composite Particles ◽  
Nano Composite ◽  
Laser Control

The Effect of Disordering on Magnetic Properties of Fe-Al Alloys

2009 ◽  
Vol 152-153 ◽  
pp. 15-18 ◽  
Author(s):  
E. Voronina ◽  
Eugene P. Yelsukov ◽  
A. Korolyov ◽  
S. Nagamatsu ◽  
T. Fujikawa ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Circular Dichroism ◽  
Mechanical Activation ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Al Alloys ◽  
Magnetic Characteristics ◽  
X Ray ◽  
Circular Dichroïsm

The results of magnetometric, Mössbauer and XMCD (X-ray Magnetic Circular Dichroism) studies of B2 or DO3–type ordered (25 to 35 at.%Al) and disordered by mechanical activation (35 to 60 at.% Al) Fe-Al alloys are considered. For the description of magnetic characteristics of the studied alloys the validity of local magnetic moments models is discussed. The models suppose that Fe atom local magnetic moments are collinear with magnitude and direction depending on the number of Al atoms in the Fe nearest neighbourhood.

scholarly journals Effect of ball milling and dynamic compaction on magnetic properties of Al2O3/Co(P) composite particles

2014 ◽  
Vol 115 (17) ◽  
pp. 17B530 ◽  
Author(s):  
E. A. Denisova ◽  
L. A. Kuzovnikova ◽  
R. S. Iskhakov ◽  
A. A. Bukaemskiy ◽  
E. V. Eremin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ball Milling ◽  
Dynamic Compaction ◽  
Composite Particles
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