Optimizations of the Sintering Temperature to Reduce the Nd3RuO7 Phase and Investigations of their Effect on the Magnetic Properties in Nd2Ru2O7

2021 ◽  
Vol 1028 ◽  
pp. 3-8
Author(s):  
Utami Widyaiswari ◽  
Hideaki Sakai ◽  
Noriaki Hanasaki ◽  
Budhy Kurniawan ◽  
Isao Watanabe
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Raw Materials ◽  
Solid State Reaction Method ◽  
Industrial Applications ◽  
Zero Field ◽  
Sintering Process ◽  
Impurity Phases ◽  
Treatment Conditions

One of the pyrochlore systems, Nd2Ru2O7, shows unique magnetic properties and can be a candidate of the electrocatalyst material for industrial applications. This system shows magnetic anomalies around 1.8 K, 21 K, and 146 K. The anomaly at 21 K is suggested to be coming from the impurity component of Nd3RuO7 and is still debatable. To investigate the effects of impurities on the magnetic properties of this sample, we synthesized some samples (labelled as Sample-I and II) using the solid-state reaction method with different heat treatment conditions and measured the magnetic susceptibility. We found that low sintering temperatures generated impurity phases of raw materials and Nd3RuO7. We also confirmed that those impurity phases were able to be reduced by optimizing heat treatment conditions. The optimum temperature for the sintering process should not be higher than 1000°C. The higher sintering temperatures yield more Nd3RuO7 impurity phases. Magnetic susceptibility measurements showed that samples with Nd3RuO7 impurity phases exhibited a peak around 21 K in the zero field-cooled condition accompanied by a broad peak around 12 K in the field-cooled condition indicating the appearance of Nd3RuO7.

scholarly journals Magnetic properties of sintered high energy sm-co and nd-fe-b magnets

2006 ◽  
Vol 38 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Nadezda Talijan
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Materials ◽  
High Energy ◽  
Scientific Meeting ◽  
Sintering Process ◽  
Technological Parameters ◽  
Magnetic Microstructure ◽  
Treatment Conditions

Magnetic properties of permanent magnetic materials based on intermetallic compounds of Sm-Co and Nd-Fe-B are in direct dependence on the microstructure. In the first part of this paper, having in mind the importance of the regime of sintering and heat treatment to obtain the optimal magnetic structure, yet another approach in defining the most adequate technological parameters of the sintering process for applied heat treatment conditions was made. The goal of these investigations was to use the correlation that exists between sintering conditions (temperature and time) and intensity of the diffraction peak of the (111) plane of the SmCo5 phase to optimize. In the second part a brief overview of high energy magnetic materials based on Nd-Fe-B is presented with special emphasis to the current research and development of high remanent nanocomposite magnetic materials based on Nd-Fe-B alloys with a reduced Nd content. Part of experimental results gained during research of the sintering process of SmCo5 magnetic materials were realized and published earlier. The scientific meeting devoted to the 60th anniversary of Frankel?s theory of sintering was an opportunity to show once more the importance and role of sintering in optimization of the magnetic microstructure of sintered Sm Co5 magnetic materials.

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

scholarly journals Effect of Y3+ Substitution on Structural and Magnetic Properties of Ni0.25 Zn0.75YxFe2-xO4

2020 ◽  
Vol 68 (2) ◽  
pp. 111-116
Author(s):  
Sharmin Akhter ◽  
Probal Roy ◽  
Armin Anwar ◽  
MA Hossain ◽  
MNI Khan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Solid State Reaction Method ◽  
Industrial Applications ◽  
Ferromagnetic Behavior ◽  
Conventional Solid State Reaction ◽  
Spinel Type ◽  
Sem Micrographs ◽  
Ray Density ◽  
Structural And Magnetic Properties ◽  
Xrd Patterns

The effect of Y3+ doping on the structural and magnetic properties of Ni0.25 Zn0.75YxFe2-xO4 [x= 0.00, 0.02, 0.04, 0.06 and 0.08] was investigated. The specimen was synthesized by conventional solid state reaction method where the sintering temperature was 1150oC for 3 hours. The structure of the specimens was inspected by XRD pattern and SEM micrographs. The XRD patterns delineate the formation of spinel type cubic structure. The lattice parameters, bulk density, X-ray density and porosity were investigated for all the samples. The SEM micrographs shows that the particles of all the composition are within 0.4 – 1.2 μm. M-H curves at room temperature exhibit the ferromagnetic behavior. The effect of Y3+ causes drastically variation on saturation magnetization (Ms), coercivity (Hc) and remanent magnetization (Mr). Moreover, the M-H curves delineate the soft ferromagnetic phenomenon which can be the reason of the acceptance of the specimen in industrial applications. Dhaka Univ. J. Sci. 68(2): 111-116, 2020 (July)

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