Structure and Magnetic Properties of the Co-Ni Alloy Nanowires Prepared by AC Electrodeposition

2013 ◽  
Vol 787 ◽  
pp. 372-375 ◽  
Author(s):  
X. Wen ◽  
Y. Zhang ◽  
X.X. Zhang ◽  
G.H. Yue ◽  
D.L. Peng
Keyword(s):  
Electron Microscopy ◽  
Magnetic Measurements ◽  
Porous Alumina ◽  
Test Results ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Anodic Porous Alumina ◽  
Ni Alloy ◽  
Axis Parallel ◽  
Alloy Nanowires

Ordered Co-Ni nanowires have been fabricated by alternating current (AC) electrodeposition method using anodic porous alumina as a template. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) test results reveal that the samples are polycrystalline with uniform diameters around 50 nm and lengths up to several micrometers. X-ray diffraction (XRD) pattern indicate the crystalline structure change from fcc to hcp as the Co composition increasing. Magnetic measurements show that the nanowires have high magnetic anisotropy with their easy axis parallel to the nanowire arrays. The coercivity (Hc) and squareness (Mr/Ms) are found to increase with the increase of ferromagnetic Co component.

Magnetic cluster developement in In1−x MnxSb semiconductor alloys

Open Physics ◽  
2010 ◽  
Vol 8 (4) ◽  
Author(s):  
Lidia Rednic ◽  
Iosif Deac ◽  
Eugen Dorolti ◽  
Marin Coldea ◽  
Vasile Rednic ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Magnetic Measurements ◽  
Semiconductor Alloys ◽  
X Ray Diffraction ◽  
Magnetic Cluster ◽  
X Ray ◽  
Small Magnetic Field ◽  
Transmission Electron

AbstractX-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscopy (TEM) and magnetic measurements as a function of applied magnetic field and temperature for In1−x MnxSb (0.05≤x≤0.2) system are reported. Magnetic measurements performed at high and small magnetic field in ZFC and FC indicate the coexistence of ferromagnetic In1−x MnxSb solid solution and two types of magnetic cluster: ferromagnetic MnSb and ferrimagnetic Mn2Sb. XPS valence band and Mn 2p core level spectra have confirmed the presence of MnSb and Mn2Sb phases. TEM images show some manganese antimonide phase microinclusions with dimension between (30–40) nm.

Synthesis of Fe2O3/CNTs for the Fast Removal of Tetracycline from Aqueous Solutions

2014 ◽  
Vol 915-916 ◽  
pp. 933-941 ◽  
Author(s):  
Zhong Jie Zhang ◽  
Chang Yu Lu ◽  
Wei Huang ◽  
Wei Sheng Guan ◽  
Yue Xin Peng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Measurements ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Wide Range ◽  
Fast Removal ◽  
Scanning Electron

The effective remove to tetracycline still remains a big challenge for scientists. In this work, we used a new method for preparing functional magnetic CNTS with ferrite nanoparticles. A wide range of techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and magnetic measurements were applied to characterize the obtained Fe2O3/CNTs. Moreover, we have also studied the properties of adsorbent to tetracycline. In addition, we have found that the Fe2O3/CNTs are better reusable adsorbent than other traditional adsorbents by magnetic separation recycling method.

scholarly journals Microstructures of Three In-Situ Reinforcements and the Effect on the Tensile Strengths of an Al-Si-Cu-Mg-Ni Alloy

2018 ◽  
Vol 8 (9) ◽  
pp. 1523 ◽  
Author(s):  
Lusha Tian ◽  
Yongchun Guo ◽  
Jianping Li ◽  
Feng Xia ◽  
Minxian Liang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Simultaneous Formation ◽  
X Ray ◽  
Transmission Electron ◽  
Ni Alloy ◽  
Al3ti Phase ◽  
Scanning Electron

In the present paper, the microstructures of three kinds of in-situ reinforcements Al-Ti-C, Al-Ti-B, and Al-Ti-B-C-Ce were deeply investigated using a combination of scanning electron microscopy, X-ray diffraction spectroscopy, and transmission electron microscopy. The effect of in-situ reinforcements on the room temperature and elevated temperature (350 °C) tensile strengths of Al-13Si-4Cu-1Mg-2Ni alloy were analyzed. It is found that doping with trace amounts of B and Ce, the size of the Al3Ti phase in the in-situ reinforced alloy changed from 80 µm (un-reinforced) to about 10 µm, with the simultaneous formation of the AlTiCe phase. The Al-Ti-B-C-Ce reinforcement which is rapid solidified, was more effective and superior to enhance the tensile strengths of the Al-13Si-4Cu-1Mg-2Ni alloy, both at room and high temperatures than those of addition other reinforcements. The room temperature (RT) strength increased by 19.0%, and the 350 °C-strength increased by 18.4%.

Enhanced Tensile Properties of Graphene-Al5083 Composite Prepared by Hot Pressing and Hot Extrusion

2016 ◽  
Vol 849 ◽  
pp. 424-429
Author(s):  
Hai Ping Zhang ◽  
Wen Long Xiao ◽  
Kei Ameyama ◽  
Guo Fu Ji ◽  
Ming Juan Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Tensile Elongation ◽  
Hot Extrusion ◽  
Powder Metallurgy Method ◽  
Test Results ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Vacuum Oven ◽  
Transmission Electron

Graphene, with outstanding mechanical properties of 1TPa of Young’s modulus and 130GPa of tensile strength, has been considered as an excellent reinforcement in composites. Graphene nanoplates (GNP) reinforced Al5083 alloy composites were successfully fabricated by powder metallurgy method. Flake-like Al5083 powder was firstly added into a GNP-alcohol solution and then dried in vacuum oven at 343 K for 5 h. The composite powders were sintered at 723K under pressure of 300 MPa for 1 h, followed by extrusion at 623 K. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed for microstructure characterization. Al4C3 cannot be observed in the composite, suggesting that there was no reaction occurred between GNP and Al matrix during the processing. Tensile test results revealed that the ultimate tensile strength and tensile elongation of 0.3wt.%GNP/Al5083 composites were 580MPa and 15%, respectively, showing optimal combination of strength and ductility. The relevant strengthening mechanisms of the composites were discussed.

Phase Transformations in Ferromagnetic Nanostructured FePd Alloy under Severe Plastic Deformation and Annealing

2010 ◽  
Vol 168-169 ◽  
pp. 392-395 ◽  
Author(s):  
N.I. Vlasova ◽  
V.S. Gaviko ◽  
A.G. Popov ◽  
N.N. Shchegoleva ◽  
L.A. Stashkova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Pressure Torsion ◽  
Magnetic Measurements ◽  
The Body ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Fcc Phase ◽  
Ordered State ◽  
Torsion Deformation

Equiatomic FePd alloy in the ordered state has been processed by means of high-pressure torsion deformation (HPTD) and then annealed. X-ray diffraction (XRD), transmission electron microscopy (TEM), and magnetic measurements have been carried out. HPTD results in an order-disorder transformation of the initial ordered L10-phase (s.g. P4/mmm) into a disordered fcc phase (s.g. Fm-3m) through the body-centered tetragonal (bct) phase (s.g. I4/mmm). Subsequent annealing restores the L10-phase.

scholarly journals Solvent-Free Mechanochemical Synthesis and Characterization of Nickel Tellurides with Various Stoichiometries: NiTe, NiTe2 and Ni2Te3

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1959
Author(s):  
Matjaž Kristl ◽  
Sašo Gyergyek ◽  
Srečo D. Škapin ◽  
Janja Kristl
Keyword(s):  
Electron Microscopy ◽  
Magnetic Measurements ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Transmission Electron ◽  
Energy Consuming ◽  
Tga And Dsc

The paper reports the synthesis of nickel tellurides via a mechanochemical method from elemental precursors. NiTe, NiTe2, and Ni2Te3 were prepared by milling in stainless steel vials under nitrogen, using milling times from 1 h to 12 h. The products were characterized by powder X-ray diffraction (pXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), dynamic light scattering (DLS), vibrating sample magnetometer (VSM), UV-VIS spectrometry, and thermal analysis (TGA and DSC). The products were obtained in the form of aggregates, several hundreds of nanometers in size, consisting of smaller nanosized crystallites. The magnetic measurements revealed a ferromagnetic behavior at room temperature. The band gap energies calculated using Tauc plots for NiTe, NiTe2, and Ni2Te3 were 3.59, 3.94, and 3.70 eV, respectively. The mechanochemical process has proved to be a simple and successful method for the preparation of binary nickel tellurides, avoiding the use of solvents, toxic precursors, and energy-consuming reaction conditions.

scholarly journals Microstructural Evolution of Rapid Solidified Al-Ni Alloys

2017 ◽  
Vol 60 (2) ◽  
Author(s):  
Manuel Alejandro Martínez-Villalobos ◽  
Ignacio Alejandro Figueroa ◽  
Miguel Angel Suarez ◽  
Gabriel Ángel Lara Rodríguez ◽  
Omar Novelo Peralta ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Melt Spinning ◽  
Aluminum Matrix ◽  
X Ray Diffraction ◽  
Morphological Transformation ◽  
Ni Alloys ◽  
Ni Content ◽  
Transmission Electron ◽  
Ni Alloy ◽  
Cast Condition

<p>In this study, Al-Ni alloy ribbons in hypoeutectic, euctectic and hypereutectic compositions were obtained by melt spinning. The microstructural changes of the samples, from the as-cast to rapid solid-ification processes at different Cu wheel tangential velocities were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The rapid solidification caused <br />morphological transformation of the Al-Al3Ni microstructure from acicular in the as-cast condition to globular in the melt spun ribbons and the growth of the metastable Al9Ni2 intermetallic compound, which acted as reinforcing particles. Due to the increment of the Ni content and the presence of these intermetallic compounds, with size of ~5nm, distributed in the aluminum matrix, the hardness of the alloys significantly increased from the hypoeutectic (90 VHN) to the hypereutectic (205VHN) composition.</p>

Facile Fabrication of Single Crystalline Fe3O4 Nanorods and its Magnetic Properties

2011 ◽  
Vol 194-196 ◽  
pp. 638-642
Author(s):  
Gui Lian Li ◽  
Xian Ming Liu ◽  
Wei Dong Yin
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Measurements ◽  
High Yield ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Single Crystalline ◽  
Transmission Electron ◽  
Facile Hydrothermal Route ◽  
Facile Fabrication

Single crystalline Fe3O4nanorods were fabricated in high yield via a facile hydrothermal route in the presence of sodium citrate as addition agent. The phase structures, morphologies, and sizes of as-prepared products were investigated in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The diameter of magnetite nanorods is about 50~80 nm and its length is more than 2 μm. Room-temperature magnetic measurements showed that Fe3O4nanorods exhibited high saturation magnetization and coercitivity of 77.8 emu/g and 98 Oe, respectively, while the as-obtained nanoparticles had low coercitivity value.

scholarly journals Structural, morphological, and magnetic properties of copper zinc cobalt ferrites systems nanocomposites

2020 ◽  
Vol 10 (4) ◽  
pp. 6015-6019
Keyword(s):  
Electron Microscopy ◽  
Magnetic Measurements ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Cobalt Ferrites ◽  
Ultraviolet Light Irradiation ◽  
Copper Zinc ◽  
Co Precipitation

In this study, by the method of co-precipitation with PEG as surfactant as agent nanocomposite of the Copper Zinc Cobalt ferrites systems (CuZnCoFO NCs) are prepared. The X-ray diffraction (XRD), transmission electron microscopy, and field emission scanning electron microscopy of the samples are carried out. To analyse the magnetic measurements the samples are subjected to the vibrating sample magnetometer (VSM). The results of the paramagnetic properties formed out of chemical precipitation method are effective at room temperature. These ferrite system nanoparticles with magnetic fields could have effective application. The photocatalyst activity when annealed at 600ºC at 2h NPs is also evaluated by Methylene Blue degradation when exposed to ultraviolet light irradiation.

Microstructure and Mechanical Properties of Spray-Deposited Zn-30Al-1Cu Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 264-267
Author(s):  
Feng Wang ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Hong Wei Liu ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tensile Tests ◽  
Chinese Script ◽  
Spray Atomization ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
Transmission Electron

In this study, Zn-30Al-1Cu alloy was synthesized by the spray atomization and deposition technique. The microstructure and mechanical properties of the alloy were studied using optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and tensile tests. It can be seen that the microstructure of spray-deposited Zn-30Al-1Cu alloy is composed of the Zn/Al eutectoids and few compounds. The Zn/Al eutectoids were shown lamellar, particle and Chinese script morphologies. The compound phases in the microstructure of the spray-deposited alloy were examined. The property test results indicate that the spray-deposited Zn-30Al-1Cu alloy displays superior tensile strength.

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