Magnetic characterization of calcium-nickel-potassium oxide catalysts

1994 ◽  
Vol 9 (11) ◽  
pp. 2993-2997 ◽  
Author(s):  
Dale L. Perry ◽  
Paul Berdahl ◽  
Charles Perrino
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Size Effects ◽  
Magnetic Behavior ◽  
Squid Magnetometer ◽  
Metallic Nickel ◽  
Potassium Oxide ◽  
Magnetic Characterization ◽  
Paramagnetic Impurities

SQUID magnetometer characterization of Ca–Ni–K–O catalyst materials reveals complex magnetic behavior. The magnetic properties are generally determined by the antiferromagnetic material NiO, but samples with traces of elemental nickel show marked effects of ferromagnetism. Potassium doping enhances the formation of metallic nickel. Further deviations from bulk NiO properties can be attributed to NiO particle size effects (superparamagnetism) and to the presence of paramagnetic impurities, possibly Ni3+ ions.

Particle size effects on stripe ordering and magnetic properties in nanosized La5/3Sr1/3NiO4

2008 ◽  
Vol 147 (7-8) ◽  
pp. 258-261 ◽  
Author(s):  
Jiyin Zhao ◽  
Lei Shi ◽  
Shiming Zhou ◽  
Laifa He ◽  
Lin Chen
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Size Effects ◽  
Particle Size Effects

Particle size effects on magnetic properties of BaFe12−2xTixCoxO19fine particles

1985 ◽  
Vol 57 (8) ◽  
pp. 4280-4282 ◽  
Author(s):  
O. Kubo ◽  
T. Ido ◽  
H. Yokoyama ◽  
Y. Koike
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Size Effects ◽  
Particle Size Effects

AC Magnetic Measurements on Superconductors

2013 ◽  
pp. 208-222
Author(s):  
Philippe Laurent ◽  
Jean-François Fagnard ◽  
Philippe Vanderbemden
Keyword(s):  
Magnetic Properties ◽  
Temperature Distribution ◽  
Magnetic Measurements ◽  
Sampling Rate ◽  
Data Acquisition System ◽  
Magnetic Data ◽  
Magnetic Characterization ◽  
Set Up ◽  
Cryogenic Conditions

This work describes the design and realisation of an apparatus to measure simultaneously the AC magnetic properties and the temperature distribution on the top surface of bulk superconducting samples (up to 32 mm in diameter) in cryogenic conditions (temperature range 78-120 K). First the authors describe the experimental set-up used for simultaneous thermal and magnetic characterization of the sample. Next, the authors describe the practical considerations required for generating the large AC magnetic fields, possibly in the presence of DC fields. Then the authors present the data acquisition system allowing both temperature and magnetic data to be recorded at high a sampling rate.” The performances and limitations of the system are discussed.

AC Magnetic Measurements on Superconductors

2011 ◽  
Vol 1 (3) ◽  
pp. 53-66
Author(s):  
Philippe Laurent ◽  
Jean-François Fagnard ◽  
Philippe Vanderbemden
Keyword(s):  
Magnetic Properties ◽  
Temperature Distribution ◽  
Magnetic Measurements ◽  
Sampling Rate ◽  
Data Acquisition System ◽  
Magnetic Data ◽  
Magnetic Characterization ◽  
Set Up ◽  
Cryogenic Conditions

This work describes the design and realisation of an apparatus to measure simultaneously the AC magnetic properties and the temperature distribution on the top surface of bulk superconducting samples (up to 32 mm in diameter) in cryogenic conditions (temperature range 78-120 K). First the authors describe the experimental set-up used for simultaneous thermal and magnetic characterization of the sample. Next, the authors describe the practical considerations required for generating the large AC magnetic fields, possibly in the presence of DC fields. Then the authors present the data acquisition system allowing both temperature and magnetic data to be recorded at high a sampling rate." The performances and limitations of the system are discussed.

Magnetic and Rheological Characterization of Fe3O4 Ferrofluid: Particle Size Effects

2005 ◽  
Vol 160 (1-4) ◽  
pp. 211-217 ◽  
Author(s):  
Kinnari Parekh ◽  
R. V. Upadhyay ◽  
R. V. Mehta
Keyword(s):  
Particle Size ◽  
Size Effects ◽  
Rheological Characterization ◽  
Particle Size Effects

scholarly journals Magnetic properties of synthetic fluorophlogopite mica crystals

2020 ◽  
Vol 1 (5) ◽  
pp. 1464-1471
Author(s):  
Zheng Ma ◽  
Vassil Skumryev ◽  
Martí Gich
Keyword(s):  
Magnetic Properties ◽  
Flexible Substrate ◽  
Magnetic Characterization ◽  
Characterization Of Materials

The contribution of synthetic fluorophlogopite mica needs to be considered in the magnetic characterization of materials grown on this flexible substrate.

The Effect of Milling Time on Physical Properties, Magnetic Properties and Microstructure of Bonded Magnet BaFe12O19

2020 ◽  
Vol 855 ◽  
pp. 34-39
Author(s):  
Suprapedi ◽  
Muljadi ◽  
Priyo Sardjono ◽  
Ramlan Ramlan
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Bulk Density ◽  
Ball Mill ◽  
Milling Time ◽  
Mixed Powder ◽  
Bonded Magnet

A bonded permanent magnet of Barium hexa Ferrite has been made using powder BaFe12O19 (commercial ferrite) and a polymer of bakelite powder as binder. The composition of bakelite was varried 5% wt. The preparation of sample was begun with mass weighing for each material, then mixed together using ball mill for 1, 6 and 12 hours and using aquades as milling media. The mixed powder is dried in an oven at 110 °C for 4 hours, then the particle size distribution was measured. After that, the dried sample powder was pressed to form a pellet at pressure 40 MPa and temperature about 160 °C for 20 minutes. The characterization of sample pellet was done such as measurement of bulk density, hardness , magnetic properties using VSM and anylisis of microstructure using SEM. The results of the characterization show that the density and magnetic properties tend to increase with increasing of milling time, where the highest density, hardness and highest magnetic properties are achieved at sample with milling time for 12 hours. The value of magnetic properties at this condition are flux magnetic of 530 Gauss, remenance of 3100 Gauss, coercivity of 1,10 kOe.

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