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 AMORPHOUS Fe40Ni38B18Mo4 RIBBONS CONTAINING NANOCRYSTALLITES

2005 ◽  
Vol 19 (06) ◽  
pp. 295-302 ◽  
Author(s):  
K. TIVAKORNASITHORN ◽  
S. NILPAIRUCH ◽  
S. VATANAYON ◽  
I. M. TANG
Keyword(s):  
Thermal Analysis ◽  
Magnetic Properties ◽  
Differential Thermal Analysis ◽  
Saturation Magnetization ◽  
Mössbauer Effect ◽  
Vibrating Sample Magnetometer ◽  
Mossbauer Effect ◽  
Mössbauer Effect Spectroscopy ◽  
Temperature Ranges ◽  
Xrd Patterns

Cut Fe 40 Ni 38 B 18 Mo 4 ribbons were annealed for two hours at various temperatures Ta between 400 and 540°C. All the ribbons were subjected to XRD, VSM (vibrating sample magnetometer) and ME (Mossbauer effect spectroscopy) investigations. A differential thermal analysis scan of an as-cast ribbon showed the presence of two exothermic peaks, the first beginning at 419.9°C and peaking at 429.7°C and the second beginning at 497.3°C and ending at 546.2°C. The XRD patterns of the ribbons showed the formation of FeNi 3 nanocrystallites in the lower T'a ribbons and (Fe, Ni, Mo) 23 B 6 crystallites in the ribbons annealed above 470°C. Different behaviors of the saturation magnetization were seen in the ribbons annealed between 400 and 450°C, between 450 and 490°C, and between 490 and 540°C. The ME spectra of the ribbons annealed in the three different temperature ranges also pointed to the presence of three crystalline Fe-compounds in these ranges. The XRD patterns and the coercivities (Hc) of the lower Ta ribbons point to the formation of nanocrystallites in these ribbons.

Phase Stability and Magnetic Properties of E21-(Co, Ni)3AlC Based Alloys

2002 ◽  
Vol 753 ◽  
Author(s):  
Yoshisato Kimura ◽  
Kaoru Iida ◽  
Yoshinao Mishima
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Saturation Magnetization ◽  
Concentration Dependence ◽  
Phase Stability ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Quaternary System ◽  
Ternary Systems ◽  
Chemical Concentration

ABSTRACTPhase stability of E21 (Co, Ni)3AlC was investigated from the viewpoint of magnetic properties in the Co-Ni-Al-C quaternary system. Isotherms of the Co-Al-C and Ni-Al-C ternary systems at 1373 K were revised and evaluated by means of electron probe microanalysis. Magnetic properties measurement revealed that discontinuity appearing on the chemical concentration dependence of Curie temperature and saturation magnetization of E21 (Co,Ni)3AlC indicates the existence of two types of E21 phase in the Co-Ni-Al-C quaternary system.

MAGNETIC PROPERTIES OF ALUMINUM-SUBSTITUTED STRONTIUM HEXAFERRITE PREPARED BY CITRATE–NITRITE SOL–GEL TECHNIQUE

2008 ◽  
Vol 22 (20) ◽  
pp. 3413-3420 ◽  
Author(s):  
Q. CHEN ◽  
X. Q. WANG ◽  
H. L. GE
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Exchange Coupling ◽  
Sol Gel ◽  
Experimental Results ◽  
Strontium Hexaferrite ◽  
Al Substitution ◽  
Gel Technique

M-type SrFe 12-x Al x O 19(0 < x < 2.5) nanoparticles have been synthesized by citrate–nitrite sol–gel technique. The experimental results have shown that Al 3+ ions substitute Fe 3+ ions in the sublattice, and the samples remain in the hexagonal magnetoplumbite phase. The saturation magnetization Ms and remanence Mr of M-type SrFe 12-x Al x O 19(0 < x < 2.5) nanoparticles linearly decrease when x increases. x = 0, Ms = 63.5 emu/g and Ms = 23.8 emu/g at x = 2.5 when the magnets are sintered at 1100°C. Meanwhile, the coercivity Hc of the samples fluctuate as doped with Al , and reach maximum Hc = 10.59 kOe when x = 1.5. The intergranular exchange–coupling interactions between the nanoparticles, which are proved by the measurement of Henkel plots (δM), and the interactions become more intensive as the Al substitution x increases.

Effect of Temperature Synthesize on the Crystalline Structures and Magnetic Properties in Co-Precipitated Cobalt Ferrite Bismuth Nanoparticles

2020 ◽  
Vol 855 ◽  
pp. 3-8
Author(s):  
Santi Pratiwi ◽  
Utari ◽  
Budi Purnama
Keyword(s):  
Magnetic Properties ◽  
Fourier Transform ◽  
Saturation Magnetization ◽  
Cobalt Ferrite ◽  
Effect Of Temperature ◽  
Vibrating Sample Magnetometer ◽  
Magnetic Characterization ◽  
X Ray ◽  
Bismuth Nanoparticles ◽  
Infra Red

The synthesis of CoBi0.15Fe1.85O4 obtained from cobalt ferrite doped by bismuth using the coprecipitation method was successfully carried out by varying the temperature of the titration. In this study the temperature of titration was used at 65°C, 75°C, 85°C, and 95°C. Annealing was then carried out at a temperature of 800°C for 5 hours. The results of the synthesis were then characterized using X-Ray Diffractometer (XRD), Fourier Transform Infra-Red (FTIR) and Vibrating Sample Magnetometer (VSM). The increase of the magnetic characterization i.e. the saturation magnetization increases and coercivity attribute the increase of the anisotropy crystalline.

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.

Modeling the Magnetic Properties of Non-Oriented Electrical Steels Based on Microstructural Parameters

2011 ◽  
Vol 702-703 ◽  
pp. 734-737 ◽  
Author(s):  
Hadi Pirgazi ◽  
Roumen H. Petrov ◽  
Leo Kestens
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Chemical Composition ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Quantitative Model ◽  
Experimental Results ◽  
Pole Density ◽  
Electrical Steels ◽  
Magnetization Behavior

Magnetic properties of electrical steels such as magnetization behavior and electrical losses are mainly related to chemical composition, crystallographic orientation and microstructure. By now, several models have been proposed to empirically correlate magnetic properties and affecting parameters. A quantitative model based on physical understanding of the interaction between the magnetic field variables (e.g. domain structure) and local microstructural variables (e.g. grain orientation and misorientation, grain boundary plane inclination) is still missing. To obtain a better understanding of the interaction between grain boundaries and domain walls, the magnitude of free pole density at grain boundaries was taken into account. Experimental results from 3-dimentional EBSD experiments were employed to measure the grain boundary orientation for several samples with different chemical composition and grain size. The free pole density was calculated using the relative misorientation between adjacent grains, and was included in a model together with grain size, magnetocrystalline anisotropy energy and silicon equivalent. By comparison with the experimental results of the magnetic induction measured at low, medium and high magnetic fields, is shown that the magnetization behavior can be more accurately predicted when the above mentioned phenomena are taken into account.

Sign in / Sign up

Export Citation Format

Share Document