Study on the Magnetic Property Deterioration of Amorphous Cores

2014 ◽  
Vol 1061-1062 ◽  
pp. 609-613 ◽  
Author(s):  
Jian Wang ◽  
Shu Lan Zhang ◽  
Xiao Tong Fu
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Water Content ◽  
Surface Quality ◽  
Chemical Reaction ◽  
Amorphous Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deterioration Mechanism

In order to solve the problem of the magnetic property deterioration of the amorphous cores annealed under high absolute water content condition, the deterioration mechanism was studied by using the SEM and X-ray diffraction equipment. The experimental results indicate that the magnetic properties deterioration of the amorphous cores is mainly related with the oxidation of the amorphous cores. It has been found that the oxidation occurred on the surface of the annealed amorphous materials. What’s more, the oxidation formed at the defects of the amorphous materials in priority. Thus the surface quality has a major impact on the oxidation and the magnetic properties deterioration. By analysis of the possibility of the chemical reaction, it is believed that the oxidation is caused by the Fe or B reaction with H2O. With the holding time increased, the oxides size and quantity increased. To reduce the influence of the H2O in the air on the magnetic properties deterioration of the amorphous materials during heat treatment, the experiment by aerating the N2 to the heat treatment furnace was performed. The experiment result proves that the magnetic properties of the amorphous cores were improved during annealing in N2, which almost reaches the same level of the amorphous cores annealed under low absolute water content condition.

Influence of Gd Addition on the Structure and Capability of Ni-Mn-In Metamagnetic Shape Memory Alloys

2012 ◽  
Vol 535-537 ◽  
pp. 950-953
Author(s):  
Li Na Bai ◽  
Gui Xing Zheng ◽  
Zhi Jian Duan ◽  
Jian Jun Zhang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Transition Temperature ◽  
Martensitic Transformation ◽  
Room Temperature ◽  
Vibrating Sample Magnetometry ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The influences of Gd concentration on martensitic transformation and magnetic properties of NiMnIn alloys were investigated by differential scanning calorimetry (DSC) , vibrating sample magnetometry (VSM), X-ray diffraction (XRD) and etc. It is Observed through the experiment: the addition of Gd enhances martensite transition temperature;X-ray diffraction analysis of experimental alloys is revealed that to the mixture is martensite and austenite at room temperature; content of Gd is not proportional to the improvement of magnetic property.

EFFECT OF NANOCRYSTALLIZATION ANNEALING ON MAGNETIC PROPERTIES AND MAGNETOIMPEDANCE OF CO-BASE RIBBONS

2012 ◽  
Vol 05 ◽  
pp. 841-846
Author(s):  
AMIR KEYVANARA ◽  
REZA GHOLAMIPOUR ◽  
SHAMSEDIN MIRDAMADI ◽  
FARZAD SHAHRI ◽  
HOSSEIN SEPEHRI AMIN
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Melt Spun ◽  
Melt Spun Ribbons ◽  
Nanocrystalline Phases

Melt spun ribbons of Co 64 Fe 4 Ni 2 B 19 Si 8 Cr 3 alloy have been prepared and the nanocrystallization process was carried out by the heat treatment of the as spun ribbons above the crystallization temperature. Structural studies of the samples have been performed by transmission electron microscopy and X-ray diffraction. Magnetic properties of the samples and magnetoimpedance measurements were investigated and it was revealed that magnetic properties and magnetoimpedance of the samples deteriorate by the formation of nanocrystalline phases.

scholarly journals Structure-Property Relation in Varieties of Millets Grown in Karnataka

2020 ◽  
pp. 1-9
Author(s):  
M. S. Suhas ◽  
Nagendra S. Kamath ◽  
P. Koushik ◽  
Vasudeva Singh ◽  
R. Somashekar
Keyword(s):  
Raman Spectroscopy ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Foxtail Millet ◽  
Elemental Distribution ◽  
Structure Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Property Relation ◽  
Magnetic Techniques

Aim: This study aims to establish structure-property relation of the varieties of millets grown in Karnataka. Study Design: Seven different varieties of millets were collected from the farms in Chitradurga district from the state of Karnataka in India. Place and Duration of Study: This study was conducted between January and April 2020 at the Vijnana Bhavan, University with Potential for excellence, University of Mysore, Karnataka Methodology: Magnetic property and characterization for seven out of the nine varieties of millets grown in Chitradurga, Hiriyur and Khandenahalli of Karnataka were carried out using X-ray diffraction studies (XRD), Energy Dispersive X-ray analysis (EDAX), Raman spectroscopy, SEM and Xplore AC magnetic techniques to understand the physical properties of these samples and to find out the structure-property relation in these millets. Results: The Foxtail millet is unique in terms of crystallites size, elemental distribution and magnetic properties. The structure-property relation of all the millets is determined. Conclusion: It is evident from these studies that all the millets are diamagnetic in nature, crystalline like order is less and the major component in all these millets is cellulose. Also the Foxtail millet has excellent structure-property relation.

Effect of MnFe2O4 and the Heat Treatment Temperature on the Bioactive Glass Properties

2016 ◽  
Vol 690 ◽  
pp. 137-142
Author(s):  
Thanaporn Boonchoo ◽  
Pratthana Intawin ◽  
Wilaiwan Leenakul
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Bioactive Glass ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Peaks

In this study, the effects of heat treatment temperatures on structural and magnetic properties in MnFe2O4(MF)/SiO2-Na2O-CaO-P2O5 (bioglass) bioactive glass ceramics were investigated. The MF/SiO2-Na2O-CaO-P2O5 bioactive glass ceramics were fabricated under various heat treatment temperatures in a range of 600-1000 °C. X-ray diffraction (XRD) technique, the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to characterize phase and microstructure. The magnetic properties were determined from Vibrating Sample Magnetometer (VSM). The X-ray diffraction peaks presented two major crystalline phases: MnFe2O4 and Na2Ca2Si3O9. It was found that the heat treatment temperatures are the most influential parameter on microstructure and magnetic properties of the bioactive glass ceramics. The highest magnetic properties of studied ceramics were found in the sample heated at 1000 °C with adding 20 wt%. MF. The microstructural properties of the studies samples were investigated and the results were then correlated with the characteristics of heat treatment temperatures as well as the microstructure of the bioactive glass ceramic.

Effect of heat treatment conditions on microstructure and magnetic property of Fe77Co2Zr9B10Cu2 alloy

2014 ◽  
Vol 28 (10) ◽  
pp. 1450083 ◽  
Author(s):  
W. Q. Yu ◽  
X. C. Meng ◽  
B. Zuo ◽  
Y. M. Sun ◽  
B. Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Property ◽  
Melt Spinning ◽  
Annealing Temperature ◽  
Grain Structure ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Treatment Conditions ◽  
Transmission Electron

Fe 77 Co 2 Zr 9 B 10 Cu 2 alloy prepared by melt-spinning was annealed at different heat treatment conditions. The thermal property, microstructure and magnetic property of alloys were investigated by differential thermal analysis (DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). Fe 77 Co 2 Zr 9 B 10 Cu 2 alloy as-quenched is a mixture of α- Fe ( Co ) phase, H -phase and amorphous phase. With increasing annealing temperature, the H -phase transforms to α- Fe ( Co ) phase. Coercivity (Hc) of Fe 77 Co 2 Zr 9 B 10 Cu 2 alloy annealed at 600°C for 40 min followed by furnace cooling reaches the minimum value, which is attributed to the small and homogeneous α- Fe ( Co ) grain structure.

Effect of Variables the HDDR Processing on Magnetic Properties and Microstructure in Permanent Magnets Based on Pr-Fe-B

2010 ◽  
Vol 660-661 ◽  
pp. 302-307
Author(s):  
P.B. Santos ◽  
S.C. Silva ◽  
Rubens Nunes de Faria Jr. ◽  
Hidetoshi Takiishi
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Scanning Electron Microscopy ◽  
Magnetic Properties ◽  
Permanent Magnets ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
X Ray ◽  
Scanning Electron

The first goal of this work involved the study of the effect of variables the HDDR processing, such as: the added pressure of H2 in the system, the time of heat treatment and recombination of Pr12Fe65.9Co16B6Nb0.1 alloy with the aim of improving the magnetic properties like the magnetic properties of the Pr14Fe63.9Co16B6Nb0.1 alloy (Br= 865mT and iHc= 790mT). The second aim of the work involved the characterization of HDDR powders that were analyzed by X-ray diffraction for identification and quantification of crystalline phases. These materials were analyzed by scanning electron microscopy (SEM).

scholarly journals Heat Treatment Effect On Magnetic Properties Of Finemet-Type Films

2016 ◽  
Vol 1 (1) ◽  
pp. 109
Author(s):  
E.A. Mikhalitsyna ◽  
V.A. Kataev ◽  
V.N. Lepalovskij ◽  
A. Larrañaga ◽  
A.S. Volegov
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Measurement System ◽  
Treatment Effect ◽  
X Ray Diffraction ◽  
X Ray

<p>A study of the heat treatment effect on the structure and magnetic properties of the amorphous and nanocrystalline Finemet-type thin films of the compositions Fe<sub>73.9</sub>Si<sub>13.2</sub>B<sub>8.9</sub>Nb<sub>3</sub>Cu<sub>1</sub> and Fe<sub>72.5</sub>Si<sub>14.2</sub>B<sub>8.7</sub>Nb<sub>2</sub>Mo<sub>1.5</sub>Cu<sub>1.1</sub> were performed by means of X-ray diffraction, magneto-optical Kerr-microscopy, and magnetic properties measurement system. The heat treatment leads to magnetic anisotropy decreasing as a result of crystallization processes, which are heavily dependent on the alloy’s composition.<strong></strong></p>

Effect of Heat Treatment on the Microstructure and Magnetic Properties of As-Cast SmCo5-Based Alloys

2012 ◽  
Vol 190 ◽  
pp. 204-207
Author(s):  
Vladimir P. Menushenkov ◽  
T.A. Sviridova ◽  
E.V. Shelekhov ◽  
L.M. Belova ◽  
Alexey P. Menushenkov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Phase Transformation ◽  
Heat Treatments ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystalline Structures ◽  
Microstructure And Magnetic Properties

Local and crystalline structures of as-cast SmCo5±xalloys subjected to various heat treatments were studied using EXAFS, X-ray diffraction, and metallographic analyses. XRD and EXAFS analyses of SmCo5-xalloys show the evidence of the Sm-enrichment of the SmCo5phase. The behavior of the lattice parameters of SmCo5phase in Sm-rich alloys during aging between 1120°C and 700°C can be related to the phase transformation of SmCo5into SmCo5-xphases.

Magnetic Property of Ni-Doped Bi5Ti3FeO15 Multiferroic Ceramics

2014 ◽  
Vol 1082 ◽  
pp. 57-60
Author(s):  
Jian Qing Li ◽  
Ling Feng Yu ◽  
Zi Peng Chen ◽  
Zheng Zheng Ma
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Solid State ◽  
Solid State Reaction ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Diffraction Peaks ◽  
Diffraction Patterns

Multiferroic ceramics of Bi5Ti3Fe1-xNixO15(x=0.1,0.2,0.5,0.7) are synthesized b the conventional solid state reaction, and their microstructure, magnetic properties are investigated. X-ray diffraction patterns show that a four-layer Aurivillus phase is formed in each sample and the diffraction peaks change obviously with the temperature increasing. The Ni ion modification induces remarkable ferromagnetism (FM) at room temperature. And the x=0.2 sample has the greatest saturation magnetization Ms~0.26552 emμ/g, and the coercive field Hc~ 0.65478 kOe

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