Materials Literature
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A method for the analysis of temperature and field dependent magnetization data near the Curie temperature TC is devised, which allows the reliable determination of critical exponents even in strongly inhomogeneous ferromagnets. It is shown, both experimentally and theoretically, that the field-induced broadening of t…
We focus on the dynamical properties of dendrimers and of randomly built branched polymers, which allows us to assess theoretically the role of disorder on the relaxation forms. We model the random polymers through a stochastic growth algorithm. Our studies are carried out both in the Rouse and also in the Zimm framew…
The compounds (Sr2−xCax)FeReO6 (x=0, 0.2, 0.5, 1.0, 1.5, and 2.0) were synthesized by solid state reaction. The resistivity exhibits a metallic behavior for Sr2FeReO6 and insulating behavior for Ca2FeReO6. Structural transformation is observed from tetragonal (x⩽1) to monoclinic (x⩾1.5). The Curie temperature increase…
ADVERTISEMENT RETURN TO ISSUEPREVNoteFormation of BaSO4 Nanoparticles in Microemulsions with Polymerized Surfactant ShellsMark Summers, Julian Eastoe, and Sean DavisView Author Information School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom Cite this: Langmuir 2002, 18, 12, 5023–5026Publication…
Three undoped lead zirconate titanate (PZT) ceramics were prepared with compositions close to the morphotropic phase boundary: Pb(Zr0.50Ti0.50)O3, Pb(Zr0.52Ti0.48)O3, and Pb(Zr0.54Ti0.46)O3. Internal friction Q−1 and shear modulus G were measured versus temperature from 20 °C to 500 °C. Experiments were performed on a…
Blending a liquid crystalline polymer (LCP) with an amorphous polymer to create a molecular composite offers a method to utilize the desirable properties of a LCP at a more modest cost. However, very few such blends are miscible. In this paper, we describe the results of a study that seeks to correlate the extent of i…
Polymer embedded granular composites, La2/3Ca1/3MnO3/polyparaphenylene (LCMO)1−x(PPP)x (x is the weight fraction of PPP), were prepared and their magnetoresistance (MR) properties were investigated. A significant enhancement in MR is observed for the composites especially in the low temperature range. The MR reaches t…
The Y 2 O 3 :Eu phosphor particles having a spherical shape and dense morphology were prepared by a pilot-scale spray pyrolysis process which involved the introduction of polymeric precursors in the spray solution. The Y 2 O 3 :Eu particles prepared from the solution without polymeric precursors had a hollow and fract…
Fluorine-doped lanthanum molybdates with the nominal formula La 2 Mo 2 O 9 - 0.5 x F x ( x = 0.20−0.30) were synthesized and characterized using powder X-ray diffraction, electron diffraction, differential thermal analysis, and impedance spectroscopy. Comparisons are made with the parent anionic conductor system La 2…
Cobalt-substituted SBA-1 cubic mesoporous molecular sieves have been synthesized in the presence of the cationic surfactant cetyltriethylammonium bromide. UV−vis spectra revealed that the majority of the cobalt ions in the CoSBA-1 samples are present in a highly dispersed state and occupy framework position (Co(II) is…
Silver telluride nanowire arrays were synthesized by cathodic electrolysis into porous anodic alumina membranes from dimethyl sulfoxide (DMSO) solutions containing 0.1 M NaNO3, 5.0 mM AgNO3 and 6.0 mM TeCl4. XRD and SAED patterns of the nanowires were indexed to be a monoclinic structure of Ag2Te. TEM images show that…
The dielectric relaxation of water molecules in polymer–water mixtures is discussed. The memory function approach and scaling relationships are used as a basis for the model of symmetric dielectric spectrum broadening. The correspondence between the relaxation time, the geometrical properties, the self-diffusion coeff…
Recently, reverse micelles were used to produce core/shell nanoparticles of iron and gold of highly uniform size distribution and reported to contain metallic iron. A composite structure of this sort is attractive in biosensor and bioactuator applications; the metallic iron core provides high magnetic sensitivity and…
Single crystals of Ni–Mn–Ga have shown 6% field induced strain in quasistatic actuation against an applied load. Here we report the ac actuation response and a magnetostrictivity constant of an off-stoichiometry single crystal of Ni–Mn–Ga measuring approximately 14×5.6×1 mm. This sample shows a maximum 3% strain under…
Magnetic and transport properties of an epitaxial film of ferromagnetic II–VI diluted magnetic semiconductor (DMS) Zn1−xCrxTe (x=0.035) were investigated. The Curie temperature TC of the film was about 15 K, which is the highest among the reported ferromagnetic II–IV DMS. Hall effect measurements at room temperature s…
Temperature dependence of structure and magnetic anisotropy of single crystalline Ni48.8Mn28.6Ga22.6 alloy exhibiting giant field-induced strain or magnetic shape memory (MSM) effect was studied in the temperature range 80–420 K. Upon cooling the alloy transforms from cubic austenite at 307 K to the martensite which e…
The vector magnetic field, H, dependencies of 0.6 GHz magnetoelastic Rayleigh-mode surface acoustic wave (SAW) attenuation, A(H), and dc magnetoresistance of polycrystalline Ni3Fe thin films with thicknesses ranging from 5.3 nm to 179.1 nm were measured and correlated with the samples’ uniaxial anisotropy fields, HK.…
The power loss of Mn–Zn ferrites has been studied as a function of magnetic flux density and frequency ( P L = k B x f y ). The exponent ( x ) of magnetic flux density was 2.94 at 100 kHz and 2.48 at 1 MHz. These results support the switch of power loss mechanism from hysteresis losses at low frequency to residual los…
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…