Synthesis and Magnetic Properties of Nanocrystalline Co-Ni Alloys: A Review

2012 ◽  
Vol 736 ◽  
pp. 229-240 ◽  
Author(s):  
Sudhakar Panday ◽  
P. Jeevanandam ◽  
B.S. Sunder Daniel
Keyword(s):  
Magnetic Properties ◽  
Binary Alloys ◽  
Synthesis Method ◽  
Surface Oxidation ◽  
Alloy Nanoparticles ◽  
Ni Alloys ◽  
Alloy Particles ◽  
Ni Alloy ◽  
Co Concentration ◽  
Potential Applications

This review article deals with the synthesis, characterization and magnetic properties of Co-Ni nanoalloys. The various physical and chemical methods for the synthesis of Co-Ni alloy nanoparticles are discussed. Co-Ni alloy nanoparticles with different size and shape such as spherical, rods, wires chain-like assembly are found to depend on the synthesis method and experimental condition. The structure of Co-Ni alloys is eitherfcc,hcpor mixedfccandhcpphase and found to depends on size, shape and concentration of Co in the Co-Ni alloys. Sodium hydroxide (NaOH) concentration and Co to Ni ratio influence the shape of bimetallic Co-Ni nanoparticles. Pt nucleating agents produced smaller size of Co-Ni alloy particles compared to Ru and Ag. Higher Co concentration in the Co-Ni alloys also influences the size alloy particles. The magnetic properties of Co-Ni nanoalloys depend on the size, shape and composition of the binary alloys. Surface oxidation of Co-Ni alloy nanoparticles decrease the saturation magnetization and increases with Co concentration in the alloys. The shape of Co-Ni alloy nanoparticles has an influence on coercivity. The microwave absorption properties of the Co-Ni alloys found to depend on the shape, size and composition of the binary alloys. The absorbance peaks shifts to higher frequency with decrease in size of the alloy particles. Potential applications of Co-Ni alloys in various fields are highlighted.

Effect of pH on Composition, Structure and Magnetic Properties of Electrodeposited Co-Ni Alloys

2009 ◽  
Vol 68 ◽  
pp. 52-59 ◽  
Author(s):  
T. Mahalingam ◽  
K. Sundaram ◽  
Subramaniam Velumani ◽  
M. Raja ◽  
S. Thanikaikarasan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Nickel Content ◽  
Cobalt Content ◽  
Soft Magnetic ◽  
Solution Ph ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Sulfate Baths ◽  
Composition Structure ◽  
Kinetics Of

Co-Ni alloy thin films were electrodeposited from sulfate baths at various solution pH values (1.5-5.5) ±0.1. The deposition kinetics of the films was studied using linear sweep voltametry (LSV). XRD studies exhibited fcc and hcp phases for Co-Ni alloys deposited at low and high pH ranges, respectively. EDAX studies showed that the cobalt content increased and nickel content decreased with increase in solution pH. The surface morphology of Co-Ni films were analyzed by scanning electron microscopy. It is found that the Co-Ni alloys synthesized at low pH exhibited soft magnetic properties and the films deposited at higher values revealed hard magnetic properties and the results are discussed.

scholarly journals ANOMALOUS ELECTRODEPOSITION OF Fe-Ni ALLOY COATING FROM SIMPLE AND COMPLEX BATHS AND ITS MAGNETIC PROPERTY

2010 ◽  
Vol 10 (2) ◽  
pp. 108-122 ◽  
Author(s):  
M A Islam
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Current Density ◽  
Coarse Grained ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Alloy Electrodeposition ◽  
Ni Alloys ◽  
Ni Alloy

Electrodeposition of Fe-Ni thin films has been carried on copper substrate under various electrodeposition conditions from two simple and six complex baths. Sulfate baths composing of NiSO4. 7H2O, FeSO4.7H2O, H3BO3 and Na2SO4KEYWORDS: Anomalous Electrodeposition, Fe-Ni Coating, Complexing agent, Current Density, Magnetic Property. 1. INTRODUCTION Alloy electrodeposition technologies can extend tremendously the potential of electrochemical deposition processes to provide coatings that require unique mechanical, chemical and physical properties [1]. There has been a great research interest in the development and characterization of iron-nickel (Fe-Ni) thin films due to their operational capacity, economic interest, magnetic and other properties [2]. Due to their unique low coefficient of thermal expansion (CTE) and soft magnetic properties, Fe-Ni alloys have been used in industrial applications for over 100 years [3]. Typical examples of applications that are based on the low CTE of Fe-Ni alloys include: thermostatic bimetals, glass sealing, integrated circuit packaging, cathode ray tube, shadow masks, membranes for liquid natural gas tankers; applications based on the soft magnetic properties include: read-write heads for magnetic storage, magnetic actuators, magnetic shielding, high performance transformer cores. comprise the simple baths whereas complex baths were prepared by adding ascorbic acid, saccharin and citric acid in simple baths. The effect of bath composition, pH and applied current density on coating appearance, composition, morphology and magnetic property were studied. Wet chemical analysis technique was used to analyze the coating composition whereas SEM and VSM were used to study the deposit morphology and magnetic property respectively. Addition of complexing agents in plating baths suppressed the anomalous nature of Fe-Ni alloy electrodeposition. Coatings obtained from simple baths were characterized by coarse grained non-smooth surface with/without microcracks onto it whereas those from complex baths were fine grained with smooth surfaces. Satisfactory saturation magnetization value of 131.13 emu/g in coating was obtained from simple bath. Coatings obtained from complex baths did not show normal magnetization behavior.

Highly stable Fe–Ni alloy nanoparticles encapsulated in carbon nanotubes: Synthesis, structure and magnetic properties

2010 ◽  
Vol 495 (1) ◽  
pp. 200-204 ◽  
Author(s):  
M.H. Xu ◽  
W. Zhong ◽  
X.S. Qi ◽  
C.T. Au ◽  
Y. Deng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Alloy Nanoparticles ◽  
Ni Alloy

Magnetic properties of Co–Ni alloy nanoparticles prepared by the sol-gel technique

2004 ◽  
Vol 272-276 ◽  
pp. E1251-E1252 ◽  
Author(s):  
C. Sangregorio ◽  
C.de Julián Fernández ◽  
G. Battaglin ◽  
G. De ◽  
D. Gatteschi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Alloy Nanoparticles ◽  
Ni Alloy ◽  
Gel Technique

Structure and magnetic properties of Cu-Ni alloy nanoparticles prepared by rapid microwave combustion method

2014 ◽  
Vol 24 (5) ◽  
pp. 1467-1473 ◽  
Author(s):  
J. ARUL MARY ◽  
A. MANIKANDAN ◽  
L. JOHN KENNEDY ◽  
M. BOUOUDINA ◽  
R. SUNDARAM ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Combustion Method ◽  
Alloy Nanoparticles ◽  
Microwave Combustion ◽  
Ni Alloy ◽  
Microwave Combustion Method

Microstructure and Magnetic Properties of Undercooled Fe-50at%Ni Alloys

2011 ◽  
Vol 695 ◽  
pp. 357-360
Author(s):  
Hui Xie ◽  
G. H. Bai ◽  
Lei Jia ◽  
Zhen Lin Lu ◽  
Sheng Zhong Kou
Keyword(s):  
Magnetic Properties ◽  
Optical Microscope ◽  
Phase Identification ◽  
X Ray ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Chemical Constitution ◽  
Maximum Undercooling ◽  
Two Phases ◽  
Microstructure And Magnetic Properties

Bulk Fe-50at%Ni alloy melts were undercooled using cyclic superheating and glass slag purification. As a result, a maximum undercooling up to 217 K could be achieved. As-solidified microstructures were observed by means of optical microscope. Phase identification of Fe-50at%Ni alloys was performed using the Shimadzu X-ray diffractometer (XRD) system. The chemical constitution revealed using a JEOL Model JSM-6700F scanning electron microscope equipped with energy dispersive X-ray spectroscopy (EDX). The magnetic properties of the alloys were measured by vibrating sample magnetometer (VSM) with a DC M-H analyzer. The results indicated that there were twice grain refinements occurred within an undercooling range of 55-217K, where the first could be ascribed to dendrite-remelting, and the second to recrystallization. The phase composition of undercooled Fe-50at%Ni alloys comprised two phases, i.e., solid solution phases withbccandfccstructure. At various undercoolings, the saturation magnetizationMsandHcrelated closely to the measured grain sizeD, and they were in proportion toD-1by the regression analysis.

SiO2-Coated Fe-Ni Alloy Core–Shell Structures Synthesized by a Facile Chemical Method

2016 ◽  
Vol 697 ◽  
pp. 303-306
Author(s):  
Guo Jun Li ◽  
Yun Hui Mei ◽  
Feng Hou
Keyword(s):  
Magnetic Properties ◽  
Spherical Particles ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
Alloy Particles ◽  
Transmission Electron ◽  
Ni Alloy ◽  
Wet Chemical ◽  
Silica Layers

Fe-Ni@ SiO2core–shell structured micrometer spherical particles with nanometer thick SiO2 shell were fabricated by a facile wet chemical process, their compositions and mechanisms were investigated using x-ray diffraction and Fourier transform of infra-red spectra, and their microstructures and magnetic properties were analyzed by high-resolution transmission electron microscopy and vibrating sample magnetometer. The structure of the synthesized SiO2-coated Fe-Ni alloy particles varied with adding TEOS contents. As-prepared Fe-Ni@SiO2 composites exhibit typical soft magnetic properties. Their highest saturation magnetization approximately linear decreases from 176 emu g−1for pure Fe-Ni alloy powders to 121 emu g−1for the coated powders with 20nm amorphous silica layers, but the coercivity of all different thickness SiO2-coated Fe-Ni alloy powders maintains in the range of about 25 Oe.

Synthesis and Characterization of Nanoscale Fe/Ni Alloy Particles by Hydrothermal Method

2013 ◽  
Vol 658 ◽  
pp. 13-18
Author(s):  
Yang Cao ◽  
Ning Gu ◽  
Jing Lin Zhang
Keyword(s):  
Hydrothermal Method ◽  
Alloy Powder ◽  
Alloy Nanoparticles ◽  
Alloy Particles ◽  
Ni Alloy ◽  
Optimum Reaction ◽  
Iron Based ◽  
And Performance ◽  
Optimum Reaction Condition

Nanoscale Fe/Ni alloy particles have been synthesized by hydrothermal method in this study. The influences of various reaction temperatures on the properties and morphologies were studied. The structure of Fe/Ni alloy nanoparticles were characterized by SEM, XRD and FTIR. Additional, the magnetic and electrical properties were also studied to obtain the optimum reaction condition. It would provide the foundation to the study about the synthesis and performance of iron-based nanoscale alloy powder.

Synthesis and Magnetic Properties of Fe–Ni Alloy Nanoparticles Obtained by Hydrothermal Reaction

2011 ◽  
Vol 239-242 ◽  
pp. 748-753 ◽  
Author(s):  
Ming Liang Yuan ◽  
Jia Hua Tao ◽  
Liang Yu ◽  
Cong Song ◽  
Guan Zhou Qiu ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Hydrothermal Reaction ◽  
Low Cost ◽  
Particle Morphology ◽  
Alkaline Media ◽  
Alloy Nanoparticles ◽  
Important Relationship ◽  
Structure Morphology ◽  
Ni Alloy

The magnetic properties of Fe-Ni alloy nanoparticles with particle size in the range 35-45 nm were prepared by almost simultaneously reducing Fe(II) and Ni(II) solution using hydrazine hydrate as a reducing agent in strong alkaline media for two hours at 80 °C. Chemical composition, crystal structure, morphology, thermal stability and magnetic properties of as synthesized Fe-Ni alloy nanoparticles were systematically characterized by means of XRD, TEM, TG-DSC and VSM. These results indicate that there is a vitally important relationship among particle size, particle morphology, and different mol ratio of FeSO4to NiSO4. The saturation magnetization (Ms). and coercivity (Hc) strongly affected by the composition of Fe-Ni alloy nanoparticles. The hydrothermal reaction is a simple, effective, and low-cost synthetic method to prepare FeNi3alloy nanoparticles.

Synthesis and Magnetic Properties of Nanocrystalline Fe-Ni Alloys During Hydrogen Reduction of NiFe2O4

2011 ◽  
Vol 49 (01) ◽  
pp. 52-57 ◽  
Author(s):  
Min Kyu Paek ◽  
Kyung Hyo Do ◽  
Mohamed Bahgat ◽  
Jong Jin Pak
Keyword(s):  
Magnetic Properties ◽  
Hydrogen Reduction ◽  
Ni Alloys
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