Materials Literature
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Cobalt and nickel doped ZnO nanowire arrays were synthesized by an electrochemical process at a temperature of 90°C. Energy dispersive x-ray spectroscopy and x-ray diffraction show that the dopants are incorporated into the wurtzite-structure ZnO. Anisotropic ferromagnetism with an easy direction of magnetization eith…
We consider relaxation of a rigid spin cluster in an elastic medium in the presence of the magnetic field. A universal simple expression for spin-phonon matrix elements due to local rotations of the lattice is derived. The equivalence of the lattice frame and the laboratory frame approaches is established. For spin Ha…
Li4C60, one of the best representatives of lithium intercalated fullerides, features a novel type of 2D polymerization. Extensive investigations, including laboratory x-ray and synchrotron radiation diffraction, 13C NMR, MAS and Raman spectroscopy, show a monoclinic I2/m structure, characterized by chains of [2+2]-cyc…
The Discrete Dislocation (DD) analysis and its computional modeling have been advanced significantly over the past decade. This progress has been further magnified by the idea to couple DD with continuum mechanics analysis in association with computational algorithms such as finite elements. This coupling may pave the…
Enhanced (001) anomalous scattering by YBa2Cu3O7-d 50 nm films on SrTiO3 substrates with and without a grain boundary versus temperature is interpreted using crystallographic weights to distinguish it from total electron yield and fluorescence spectra. The power of diffraction enhancement is to ascertain the film oxyg…
We argue that the scaling of the anomalous Hall effect (AHE) by Mathieu et al. [Phys. Rev. Lett. 93, 016602 (2004)] does not provide support to the interpretation of the AHE in SrRuO3 as an intrinsic effect due to Berry phase monopoles in k-space.
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…