A5039317933- Magnetic Properties of Alloys
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Hydrogen Storage and Materials
- Metallurgical and Alloy Processes
- Magnetism in coordination complexes
- Metallic Glasses and Amorphous Alloys
- Electric Motor Design and Analysis
- Nanoporous metals and alloys
- Heusler alloys: electronic and magnetic properties
- Carbon Nanotubes in Composites
- Electrocatalysts for Energy Conversion
- Superconducting Materials and Applications
- Electromagnetic wave absorption materials
- Polymer Nanocomposite Synthesis and Irradiation
- Inorganic Chemistry and Materials
- ZnO doping and properties
- Polymer Nanocomposites and Properties
- High-pressure geophysics and materials
- Ammonia Synthesis and Nitrogen Reduction
- Shape Memory Alloy Transformations
- Molecular Junctions and Nanostructures
- Membrane Separation and Gas Transport
National Centre of Scientific Research "Demokritos"
2014-2024
University of Delaware
2003-2019
Verizon (United States)
2015
Institute of Nuclear and Particle Physics
2013
University of Ioannina
2001-2002
Hexagonal close-packed (hcp) Ni particles were prepared in the nanosize range (13–25 nm) by reduction of Ni(NO3)2 polyethylene glycol (PEG) with various molecular weights. The reaction occurred presence an equimolecular mixture oleic acid and oleyl amine, which plays role a stabilizer gives solubility to nanoparticles non-polar solvents. crystal structure seems be controlled weight PEG molecule subsequently temperature. magnetic properties hcp are also studied.
Cobalt carbide nanoparticles were processed using polyol reduction chemistry that offers high product yields in a cost effective single-step process. Particles are shown to be acicular morphology and typically assembled as clusters with room temperature coercivities greater than 3.4 kOe maximum energy products 20 kJ m−3. Consisting of Co3C Co2C phases, the ratio phase volume, particle size all play important roles determining permanent magnet properties. Further, shape provides an...
Cobalt platinum polypod-like nanostructures were synthesized by thermolytic reduction of Pt(acac)2 and Co(CH3COO)2 in oleylamine at 250 °C. The as-made CoPt nanopolypods are ferromagnetic, soluble nonpolar organic solvents, reveal a coercive field 525 1200 Oe room temperature 5 K, respectively.
The tetragonal R1-xZrx (FeCo)11Ti alloys, where R is a rare earth and T transition metal, are promising candidates for permanent magnets. Sm1-xZrx(Fe0.8Co0.2)12-yTiy (x=0 0.25; y=1 0.7) master alloys were prepared by arc-melting under argon atmosphere. two samples with an atomic amount of Ti equal to 1 almost single-phase 1:12 compounds small a-Fe(Co), while after the replacement Sm Zr third phase TbCu7 type appeared in other samples. as-cast ingots milled using high-energy ball milling...
SmCo5 is a well-established material in the permanent magnet industry, sector which constantly gains market share due to increasing demand but also suffers from criticality of some raw materials. In this work we study possibility replacement Sm with other, more abundant rare earth atoms like Ce-La. These materials are usually called "free" rare-earth minerals, appearing as by-product during mining and processing other Samples nominal stoichiometry Sm1-xMMxCo5 (x = 0.1-1.0) were prepared bulk...
CoPt nanoparticles with an average size of 3 nm and narrow distribution were synthesized by chemical reduction Co(CH(3)COO)(2) Pt(acac)(2) polyethyleneglycol-200. The as-prepared have a disordered fcc structure which transformed after thermal treatment to ordered fct structure, results in coercivity up 6 kOe at room temperature 9 5 K because the high magnetocrystalline anisotropy tetragonal [Formula: see text].
SmCo5 constitutes one of the strongest class permanent magnets, which exhibit enormous uniaxial magnetocrystalline anisotropy energy and have a high Curie temperature. However, performance magnets is hindered by limited product relatively supply risk. Sm moderately expensive element among its group, Co material more than Fe, making most magnets. Subsequently, need for new materials, with less content in critical thus resources, obvious. A promising path producing compounds that meet these...
SmCo5 constitutes one of the strongest classes permanent magnets, which exhibit magnetocrystalline anisotropy with uniaxial character and enormous energy possess high Curie temperature. However, performance magnets is hindered by a limited product relatively supply risk. Sm moderately expensive element within lanthanide group, while Co more material than Fe, making SmCo5-based among most materials in group. Subsequently, need for new less content critical thus resources obvious. A promising...
The use of the mischmetal alloy, comprised La and Ce in 1 : 3 ratio, as a partial substitute for Sm CaCu5-type structure is explored, means search viable alternatives permanent magnets that require fewer steps rare earth separation processing. structural magnetic properties introduced stoichiometry, containing 50% less Sm, are compared to ones SmCo5, LaCo5 CeCo5 binary compounds by ab initio simulations. capability artificial neural networks accurately predict relationship between total...
We present a combined experimental and computational study of high temperature magnetic properties Fe–Cr alloys with chromium content up to about 20 at.%. The cluster expansion method is applied model the random alloys, in particular Curie transition temperature, as function alloy composition. find that at low (3–6 at.%) Cr increases increase concentration. It maximum approximately 6 at.% then decreases for higher content. same feature found thermo-magnetic measurements performed on where 5...
The effect of quenching wheel speed on the structure and Curie temperature Fe73.5Si13.5B9Nb3Cu1 alloy has been investigated using X-ray diffraction, differential scanning calorimetry, transition electron microscopy a SQUID magnetometer. Ribbons were melt-spun at different speeds then annealed to nucleate nano crystals embedded in amorphous matrix. results indicated that thickness ribbons was inversely proportional following power law type t∝V(s)(-1.231). DSC XRD showed higher greater...
FePtMn nanoparticles with a narrow size distribution and an average diameter of 3 nm were synthesized by the chemical reduction Fe(acac)(3) Pt(acac)(2) NaBH(4) thermal decomposition Mn(2)(CO)(10) in phenyl ether. The as-made have disordered face-centred cubic (fcc) structure, which transformed after treatment at 650 °C to ordered tetragonal (fct) possessing coercivity values up 13.7 kOe room temperature. annealed samples depends on amount Mn added reaction mixture, coercive field increasing...