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Ebrahimi, S A Seyed; Ponton, C. B.; Harris, I.R.; Kianvash, A.

doi:10.1023/a:1004445020083

Cited by 18 publications

(15 citation statements)

References 6 publications

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“…On the other hand, Ebrahimi et al [21][22][23][24][25] treated strontium hexaferrite powder prepared in a hydrogen atmosphere and/or nitrogen atmosphere followed by re-calcined processes in air to enhance the magnetic properties of Sr-hexaferrite. They found that values of maximum magnetization after re-calcination are almost the same as those of the initial materials before the treatment while the hydrogenation and re-calcination treatment increased the coercivity.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of magnetic properties for the barium hexaferrite prepared through ceramic route

Hessien

Radwan

Rashad

2007

Journal of Analytical and Applied Pyrolysis

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Section: Introductionmentioning

confidence: 99%

Enhancement of magnetic properties for the barium hexaferrite prepared through ceramic route

Hessien

Radwan

Rashad

2007

Journal of Analytical and Applied Pyrolysis

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“…The mechanism and kinetics of reduction of different ferrites such as ferrites of cobalt, zinc, strontium, barium and magnesium were investigated. [3][4][5][6][7][8][9][10][11] NiFe 2 O 4 has been synthesized by various methods such as solid-state reaction, co-precipitation, high-temperature selfpropagating, microemulsion, solvothermal, hydrothermal, mechanosynthesis, sol-gel and combustion techniques. [12][13][14][15][16][17][18] Reduction of NiFe 2 O 4 was handled very limited through some investigations.…”

Section: Introductionmentioning

confidence: 99%

Reduction Kinetics and Mechanisms of NiFe<SUB>2</SUB>O<SUB>4</SUB> with Synthesis of Nanocrystalline Fe-Ni Alloy

2007

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Nickel ferrite (NiFe 2 O 4 ) powder was prepared through the ceramic route by calcination of a stoichiometric mixture of nickel oxide and iron oxide. The produced powders of NiFe 2 O 4 were isothermally reduced in pure hydrogen at 800-1100 C. Based on thermogravimetric analysis, the reduction behavior of nickel ferrite and the kinetics reaction mechanism were studied. The initial ferrite powder and the various reduction products were characterized by XRD, SEM, TEM and reflected light microscope to reveal the effect of hydrogen reduction on composition and microstructure of produced Ferronickel alloy. Microstructure of partially and completely reduced samples was studied and the activation energy values were calculated from Arrhenius equation. The approved mathematical formulations for the gas solid reaction were applied and it was found that the reaction is controlled by the combined gaseous diffusion and interfacial chemical reaction mechanisms at both of the initial and the final reaction stages. Complete reduction of NiFe 2 O 4 was almost achieved with 95.5-100% reduction extent at 800-1100 C respectively. The FCC Fe ð0:7À0:64Þ -Ni ð0:3À0:36Þ alloy was synthesized with nanocrystalline size ranged from 24 nm at 800 C to 16

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“…According to the above-mentioned microstructure observations, grain growth takes place with increase in the reduction temperature, which resulted in a decrease in coercivity as well as remanence magnetization due to lower squareness factor [8]. Therefore, with much coarser microstructure, H c and B s decreased.…”

Section: Magnetic Propertiesmentioning

confidence: 95%

“…The heat treatment in hydrogen or nitrogen atmosphere followed by the re-calcination process was handled. Ebrahimi et al [8][9][10][11][12] studied the hydrogenation and recalcination processes for synthesized strontium hexaferrite powder. It was found that Sr-hexaferrite decomposed into Sr 7 Fe 10 O 22 and Fe 2 O 3 ,which reduced to Fe and FeO.…”

Section: Introductionmentioning

confidence: 99%