Materials Literature
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The dielectric response of complex materials is characterized, in many cases, by a similar power law frequency dependence of both the real and the imaginary parts of their complex dielectric constants. In the admittance representation, this power law is often shown as the constant phase angle (CPA) response. Apparentl…
In this chapter we review the magnetic effects produced by proton irradiation on graphite, disordered carbon and fullerene films. The advantage of proton irradiation is twofold: it enables us to make an impurity analysis simultaneously to the implantation of hydrogen. In this chapter we will review the main effects ob…
We report on the chemical stability of La2/3Ca1/3MnO3 thin films. X-ray absorption spectroscopy at the Mn L-edge and O K-edge makes evident deviations from the nominally expected (2/3-1/3) Mn3+/Mn4+ ratio after the growth of thin films on LaAlO3 substrates. As-grown thin films, exhibiting Curie temperature, TC, well b…
We present effects of dislocation inertia on the driven dislocation glide through local immobile pinnings using a stochastic computational model. The global dislocation velocity at a higher stress range is found noticeably dependent on the dislocation inertia, and the temperature sensitivity is observed to be strongly…
For an electrodeposited bismuth telluride (BixTe1−x) nanowire from one batch with x found to be about 0.46, the Seebeck coefficient (S) was measured to be 15%–60% larger than the bulk values at temperature 300K. For four other nanowires from a different batch with x≈0.54, S was much smaller than the bulk values. The e…
Several intermediate phases have recently been identified in the ${\mathrm{PbZr}}_{x}{\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{O}}_{3}$ (PZT) phase diagram, located close to the antiferroelectric-ferroelectric and morphotropic phase boundaries. Superlattice reflections from some of these phases are clearly visible in t…
Percutaneous hot saline injection therapy (PSIT) is becoming a very effective way of killing the target tumor in deep human body through direct heat deposition. Although the old-style injector may scald the healthy tissues along the insertion path of the needle during the operation, the newly proposed concentric tube…
Non‐agglomerated and homogeneously dispersed nickel nanoparticles were obtained on the surface of zirconia particles from the solution of three different nickel salts (nitrate, chloride, and acetate) in ethanol. After a drying process, the powders were calcined and reduced. Transmission electron microscopy studies onl…
Pb 0.6 Sr 0.4 TiO 3 (PST) ferroelectric thin films were prepared on two different substrates by sol–gel methods. Films derived on the LaNiO(LNO)/Pt/Ti/SiO 2 /Si substrates showed a strong (100) preferred orientation. The PST thin films grown on the LNO/Pt/Ti/SiO 2 /Si(100) substrate showed a non‐uniform rounded grain…
Abstract Surface‐enhanced Raman scattering (SERS) of an amino acid, phenylalanine and an antifreeze glycoprotein have been probed using Ag‐coated porous glass‐ceramic substrates. The pore size of porous glass‐ceramic was in the 50‐nm to submicrometer range. The test molecules in aqueous solution were directly adsorbed…
We report on a theoretical study of quantum transport in carbon nanotubes in the presence of two different sources of scattering: a static short-range random potential that simulates lattice defects, superimposed onto a long-range time-dependent perturbation that mimics the phonon-induced real-space atomic displacemen…
Abstract A spectroscopic method of characterizing the growth orientation of low‐dimensional ZnO structures is proposed on the basis of the angular dispersion of polar phonon modes. According to this approach, the orientational distribution of a randomly oriented one‐dimensional ZnO structure can be measured quantitati…
Structural analysis on carbonaceous samples produced from high temperature–pressure conditions by Palatnik et al. in 1984 indicate the existence of a metallic allotrope of carbon with a diffraction pattern closely matching that of cubic diamond. A structure proposed for this phase by Konyashin et al. and others sugges…
Abstract Silver‐colloid solutions have been used as the medium for surface‐enhanced Raman spectroscopy (SERS) for over two decades. UV‐Vis absorption is often used to determine the state of aggregation of the colloid, considered a critical parameter for a successful SERS experiment, especially when using an IR excitat…
The technique of introducing interlayers has been used extensively to mitigate residual thermal stresses in joining dissimilar materials. Finite‐element analyses have often been used to quantify thermal stresses in these layered structures in case‐by‐case studies. Recently, simple analytical models containing only thr…
We have fabricated Mn-doped CdS (CdS:Mn) nanocrystals embedded in Al2O3 matrices by sequential ion implantation and studied their photoluminescence (PL) properties by a scanning near-field optical microscope (SNOM). In the PL spectra of CdS:Mn nanocrystals measured by the SNOM, several sharp PL lines and a broad PL ba…
The microstructure evolution during a liquid-liquid phase transformation was calculated. The effect of Brownian coagulation on the microstructure development was investigated. The results indicate that Brownian coagulation has a weak effect on the nucleation of the minority phase droplets. For a given alloy compositio…
Novel faceted α‐SiAlON micro‐crystals were prepared by combustion synthesis with proper additives. These crystals exhibited various end shapes, including smooth flat hexagonal faces, pyramids bounded by six small isosceles triangles, and partial pyramids with the sharp roofs removed. The formation mechanisms of differ…
We present an analysis of the dependence of the resonant orbital-order and magnetic scattering spectra on the spin configuration. We consider an arbitrary spin direction with respect to the local crystal field axis, thus lowering significantly the local symmetry. To evaluate the atomic scattering in this case, we gene…
Ethylene propylene diene monomer rubber (EPDM) is blended with nitrile rubber (NBR). The morphology of this blend is improved by the addition of modified EPDM in small amounts. The intrinsic viscosity, permittivity measurements, and scanning electron microscopy revealed improved compatibility of these rubbers. Mechani…