Materials Literature
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This article reports our investigation on the behavior of some heavy and light rare earth-cobalt magnets at high temperatures. Magnetic properties and the temperature coefficients of magnetization, α, over a wide temperature range have been studied for various magnets, which include RE(Co0.74Fe0.14Cu0.09Zr0.03)7.4 for…
New developments in powder metallurgical composites make soft magnetic composite (SMC) material interesting for application in electrical machines, when combined with new machine design rules and new production techniques. In order to establish these design rules, one must pay attention to electromagnetic loss charact…
Magnetic properties of α-Fe/Nd2Fe14B nanocomposite produced from Nd8Fe87−xB5Zrx (x=0–5) alloys and their microstructures are studied by three-dimensional atom probe (3DAP) and transmission electron microscopy techniques. Zr substitution is found to increase coercivity significantly from 356 kA/m for x=0 to 625.2 kA/m…
In an attempt to synthesize nanosized (Li0.5xFe0.5xZn1−x)Fe2O4 (0⩽x⩽1) particles with high magnetic saturation and low coercivity, the energetic ball milling technique was employed. LiCO3, α-Fe2O3, and ZnO powders were used as starting materials. The ball milled, partially crystallized lithium zinc ferrite starts to c…
The glass-forming ability, thermal stability, crystallized structure, and magnetic properties have been investigated for an Fe66.5Co10Pr3.5B20 glassy alloy with a large supercooled liquid region of 43 K before crystallization and a high reduced glass transition temperature of 0.56. The glassy phase is formed in a rod…
We present the dependence of the magnetostriction in Ni0.8Fe0.2 films on Tb and Gd doping concentration and compare with the measured doping dependence of the high-frequency damping. While the magnetostriction and the high-frequency damping are correlated, the dependence is complicated. In particular, the high-frequen…
The magnetoimpedance (MI) effect has been investigateded in Fe63.5Cr10Si13.5B9Cu1Nb3 alloy wire exhibiting an ultrasoft magnetic character after suitable thermal treatment at 525 °C. It has been measured as a function of the sample length and of the distance to the ends of the wire (MI profile). The observed dependenc…
The two main effects underlying the magnetic shape memory effect in Ni2MnGa are martensitic transformations and magnetic anisotropy energies. Both issues are addressed here with first-principles calculations. First, we examine how the tetragonality in the martensitic phase varies with the composition. Then, the actual…
Differential scanning calorimetry and Raman spectroscopy measurements have been performed to investigate the β-cubic (c) phase transition of the compositionally homogeneous ZrO2-22 mol % ScO1.5 solid solution. The enthalpy of transition (1.11 kJ/mol of cation) and thermal hysteresis between β- and c-phases were smalle…
The phase diagram of hexagonal HoMnO3 in the magnetic-field/temperature plane is investigated by second harmonic generation (SHG). Four different magnetic phases of the frustrated Mn sublattice are identified on the basis of the selection rules for SHG. In-plane or interplane reordering of Mn spins at the phase bounda…
Investigations were made into the effect of small additions of Ni, Mo, Sn, as well as larger additions of Al on the magnetostriction of single crystal Fe100−xGax alloys (x≅13). The Fe–Ga and Fe–Al systems are seemingly unique among the Fe-based alloys in having very large magnetostrictions in spite of Ga and Al being…
The sputter deposited NiZn ferrite thin films were studied as a function of annealing temperature. The magnetization showed a monotonic increase with increasing annealing temperature. The coercivity shows a minimum at annealing temperature of 400 °C and shows a value of 14 Oe. Transmission electron microscopy study in…
To gain insight into the thermodynamics of protein denaturation, the complex heat capacity, C p * (= C p ‘ − iC p ‘ ‘) of lysozyme−water system has been measured at pH 2.5 in the 293−368 K range by using temperature-modulated scanning calorimetry (TMSC), a technique in which the thermally reversible enthalpy changes a…
MnBi forms peritectically at ∼450 °C. Preparation of MnBi employing conventional techniques such as arc melting and induction melting results in the segregation of manganese. In order to avoid this segregation, we followed the procedure recommended by Guo et al. [X. Guo, A. Zaluska, Z. Altounian, and J. O. Strom-Olsen…
Small-angle neutron scattering (SANS) has been used to measure the chain dimensions of syndiotactic polypropylene ( s -PP) in the melt, using mixtures of 1 H- and 2 D-labeled molecules. This leads to a segment length 7.6 Å normalized to a four-carbon repeat unit, which is in excellent agreement with a prediction based…
The conducting polymers such as polyaniline, polypyrrole and polythiophene were functionalized with copper phthalocyanine using chemical oxidation method. The obtained polymers viz. PANI-CuPc, PPy-CuPc and PT-CuPc were studied as chemical sensors by their response characteristics after exposure to various chemical vap…
Scanning tunneling microscopy and core level photoelectron spectroscopy measurements have been used to investigate the morphology of ZnO(0001 macro)-O, and its reactivity with carbon monoxide and carbon dioxide, as a function of surface preparation. Real space images of the surface indicate that increasing the substra…
Steels with high Si content (up to 6.5% Si) are excellent soft magnetic materials, however, as the Si content is increased, the material becomes extremely brittle and it is very difficult to produce thin sheet by conventional rolling. An alternative production route has been developed through hot dipping in a high Si-…
High purity MnBi low temperature phase has been prepared and analyzed using magnetic measurements and neutron diffraction. The low-temperature phase of the MnBi alloy has a coercivity μ0iHc of 2.0 T at 400 K, and exhibits a positive temperature coefficient from 0 to at least 400 K. The neutron data refinement indicate…
Using oxalate as a stabilizing agent, stable colloidal solutions of platinum nanoparticles of different shape distributions were prepared by reducing K 2 [Pt(C 2 O 4 ) 2 ], K 2 PtCl 6, or K 2 PtCl 4 with hydrogen. The mean diameters of the Pt nanoparticles prepared from these precursors are 6.5, 3.5, and 7.9 nm, respe…