Heat-treatment conditions as a factor in the magnetic properties of polyacrylonitrile carbon fibre

1976 ◽  
Vol 8 (3) ◽  
pp. 259-261
Author(s):  
P. A. Pshenichkin ◽  
T. N. Shashkova ◽  
V. M. Martynov ◽  
L. S. Tyan ◽  
V. S. Samoilov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Carbon Fibre ◽  
Treatment Conditions

Effects of Heat Treatment Conditions on Magnetic Properties and Structural Features of Nanocrystalline Fe79Zr10N11 Films

2009 ◽  
Vol 152-153 ◽  
pp. 70-74 ◽  
Author(s):  
E.N. Sheftel ◽  
Rauf S. Iskhakov ◽  
S.V. Komogortsev ◽  
P.K. Sidorenko ◽  
Nikolai S. Perov
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Structural Features ◽  
Soft Magnetic ◽  
Exchange Correlation ◽  
Calculation Technique ◽  
Treatment Conditions ◽  
Random Magnetic Anisotropy ◽  
Anisotropy Model

Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocrystalline Fe79Zr10N11 films were obtained using a calculation technique in frame of the random magnetic anisotropy model. The calculations are performed using approach magnetization to saturation curves. The local magnetic anisotropy fields (Ha), and magnetic anisotropy correlation radii (Rс) reduced to =(A/K)1/2 were determined for the films annealed at 475 and 6000 C for 0.5, 1, 2, and 3 h. The correlation Hc ~(Rc/)3 for the all annealed films was found.

Effect of Heat Treatment on Microstructure and Magnetic Properties of Strontium Hexaferrite Nanoparticles Prepared in Presence of Non-Ionic Surfactant

2013 ◽  
Vol 202 ◽  
pp. 193-205
Author(s):  
Nital R. Panchal ◽  
Rajshree B. Jotania
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Tween 80 ◽  
Strontium Hexaferrite ◽  
Ionic Surfactant ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Higher Temperature ◽  
Co Precipitation ◽  
Microstructure And Magnetic Properties

SrFe12O19 hexaferrite particles containing polyoxyethelene (20) sorbitan monolate (Tween-80) were synthesized by a chemical co-precipitation technique with a precipitator NH3.H2O. The prepared Sr-M hexaferrite precipitates were heat treated at various temperatures 650 oC, 750 oC, 850 oC, 950oC and 1100oC for 4 hrs in a muffle furnace. The obtained Sr-M powders were characterized by using various instrumental techniques, like FTIR, TGA, XRD, SEM, VSM and Mössbauer spectroscopy. Their physical as well as Magnetic properties were compared. It was observed from XRD results that heat treatment conditions play significant role in the formation of pure SrFe12O19 hexaferrite phase and also in the grain size. The estimated particle size is of the order of nanometer when suitable calcination temperature is applied. SEM micrographs show an increase in crystallite size of the resultant SrFe12O19 hexaferrite particles sintered at higher temperature (1100 oC). Mössbauer spectroscopic measurements were carried out at room temperature. Mössbauer analysis indicates the presence Fe3+ ions in the prepared strontium hexaferrite particles.

Effects of heat treatment conditions on the structural and magnetic properties of MgCuZn nano ferrite

2012 ◽  
Vol 38 (7) ◽  
pp. 5813-5820 ◽  
Author(s):  
Ch. Sujatha ◽  
K. Venugopal Reddy ◽  
K. Sowri Babu ◽  
A. RamaChandra Reddy ◽  
K.H. Rao
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Treatment Conditions ◽  
Structural And Magnetic Properties

Dependence of the magnetic properties of steels Ni32Cr10 and Ni32Cr12 on heat-treatment conditions

1968 ◽  
Vol 11 (4) ◽  
pp. 54-57
Author(s):  
B. P. Khromov ◽  
G. N. Dement'ev ◽  
G. A. Buzunov
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Treatment Conditions

Impact of the heat treatment conditions on crystal structure, morphology and magnetic properties evolution in BaM nanohexaferrites

2021 ◽  
Vol 866 ◽  
pp. 158961 ◽  
Author(s):  
A.V. Trukhanov ◽  
K.A. Darwish ◽  
M.M. Salem ◽  
O.M. Hemeda ◽  
M.I. Abdel Ati ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Treatment Conditions ◽  
Structure Morphology

Microstructures and magnetic properties of cast alnico 8 permanent magnets under various heat treatment conditions

2019 ◽  
Vol 552 ◽  
pp. 136-141 ◽  
Author(s):  
Sajjad Ur Rehman ◽  
Qingzheng Jiang ◽  
Weikai Lei ◽  
Kai Liu ◽  
Liangliang Zeng ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Permanent Magnets ◽  
Treatment Conditions

Magnetic Characteristics of RCo7−xZrx Alloys (invited) (R = Sm, Pr, Er, Gd, and Y)

1999 ◽  
Vol 577 ◽  
Author(s):  
M.Q. Huang ◽  
W.E. Wallace ◽  
M.E. Mchenry ◽  
S.G. Sankar ◽  
Qun Chen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Moments ◽  
Anisotropy Field ◽  
Experimental Results ◽  
Magnetic Characteristics ◽  
Treatment Conditions ◽  
Experimental Values ◽  
Co Alloys

ABSTRACTA brief review is presented of recent work dealing with the structure and magnetic properties of RCo7−x Zrx alloys (R=Sm, Pr, Er, Gd, and Y). The experimental results obtained are consistent with a model in which Zr atoms partly replace dumbbell Co atoms and play an important role in stabilizing the TbCu7 structure while significantly increasing the anisotropy field (HA). For example, when R=Sm, HA increases from 90 kOe for x=O to 130 kOe for x=0.2 at 300 K, and from 140 kOe for x=0 to 220 kOe for x=0.2 at 10 K. In the case of R=Y and Gd, HA is mainly contributed by the Co sublattice. For R=Y alloys, HA increases from 18 kOe for x=0 to 74 kOe for x=0.2 at 300 K and from 20 kOe for x=0 to 82 kOe for x=0.2 at 10 K. For R=Gd alloys, HA shows the largest enhancement. It increases from 35 kOe for x=0 to 140 kOe for x=0.2 at 300 K and from planar for x=0 to uniaxial with 182 kOe for x=0.2 at 10 K. In general, experimental results are in accord with the theory of Greedan and Rao for anisotropies of R-Co alloys. The magnetic moments for cobalt and rare earth in RCo7−xrx compounds (x=0∼A).2) have been estimated from the experimental values. The results show that they are nearly the same as those in RCo5 or R2Co17. The Co moment is 1.5∼;1.6 μB. Some phase transition phenomenon between RCo5, RCo7, R2Co17and R2Co7at different heat treatment conditions will also be discussed.

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