Materials Literature
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A class of quasiperiodic tilings of the complex plane is discussed. These tilings are based on beta-expansions corresponding to cubic irrationalities. There are three classes of tilings: Q(3), Q(4) and Q(5). These classes consist of three, four and five pairwise similar prototiles, respectively. A simple algorithm for…
A ferroelectric thin film of Aurivillius phase K0.5Bi4.5Ti4O15 (KBT) with a complex bismuth layer-structure was fabricated using the pulsed laser deposition method. The thin film grown on Pt/Ti/SiO2/Si substrate shows a strong c-axis orientation, as revealed by x-ray diffraction results, and platelike growth of grains…
We evaluate the second moments of the fluctuations of the total longitudinal heat flux in cylindrical nanowires described by phonon hydrodynamics with boundary conditions accounting for phonon boundary collisions. It is found that the second moments exhibit an explicit dependence on the boundary conditions and, theref…
Dielectric properties of annealed and as-grown ferroelectric Ba0.5Sr0.5TiO3 (BST) grown by pulsed laser deposition on sputtered BST seed layers on strontium titanate (STO) substrates were investigated at microwave frequencies in the realm of tunability of its dielectric constant as well as phase shifters based on this…
The structure and the electronic and optical properties of halogenated copper-phthalocyanine (nalpha,mbeta(Hal)-CuPc) molecules are investigated, according to the variation in the substituted halogen-atom species (Hal=Cl or Br) at the alpha and beta positions of isoindole ring with different numbers (n and m=0, 4, 8,…
Tm 3 + / Yb 3 + codoped Y2O3 transparent ceramics were fabricated and characterized from the point of upconversion luminescence. All the samples exhibited high transparency not only in near-infrared band but also in visible region. Under 980 nm excitation, the ceramics gave upconversion luminescence with very intense…
Low temperature atomic position modulations and magnetic moment modulations are reported for CaCu(x)Mn(7 - x)O(12) (x = 0.0, 0.1 and 0.23) using neutron powder diffraction. Both modulations are described with propagation vectors (0, 0, q) parallel to the c-axis in the hexagonal setting. The present neutron diffraction…
An electric-field modulation of the magnetic properties through converse magnetoelectric effect was reported in Fe films directly grown on BiScO3–PbTiO3 (BSPT) ceramics based on the magneto-optical Kerr effect. When an electric field was applied on the piezoelectric BSPT ceramics, the coercive field (Hc) of the ferrom…
Experimental investigations on magnetic anisotropy energies of epitaxial ${\text{Fe}}_{100\ensuremath{-}x}{\text{Si}}_{x}$ thin films on MgO(001) have been extended to low Si concentration. We separated different contributions and found that the strain-induced magnetocrystalline anisotropy term favors an in-plane easy…
In a previous study by Asay et al. [J. Appl. Phys. 106, 073515 (2009)], the inelastic response of annealed and cold-rolled pure polycrystalline tantalum at intermediate strain rates was characterized with ramp wave loading to peak longitudinal stresses of 17 GPa. It was found that the annealed Ta at strain rates of ab…
ZnO quantum dots were synthesized via a low‐temperature solvothermal process without using surfactants. Heat treatment of ZnCl 2 and NaOH solutions in tetra‐ethylene glycol at 140°C led to the formation of spherical ZnO nanoparticles consisting of the aggregates of uniform‐sized quantum dots. The particle size and mor…
Using first-principles band structure methods, we investigate the interactions between different donors in In2O3. Through the formation energy and transition energy level calculations, we find that an oxygen-vacancy creates a deep donor level, while an indium-interstitial or a tin-dopant induces a shallow donor level.…
The obtained spectroscopic data for absorption and scattering characteristics of nanoporous silica in the wavelength range from 0.25 to 7 μm are analyzed on the basis of the Mie theory. It is shown that aggregates of primary nanoparticles are responsible for relatively high scattering in the short-wave range from 0.25…
It has been a great challenge to produce anisotropic nanocrystalline bulk magnets. In this paper, we report our recent work in preparing anisotropic bonded magnets consisting of SmCo5 nanocrystalline particles. The work involved synthesis of nanocrystalline hard magnetic SmCo5 particles by ball milling in the presence…
Effects of hot pressing (HP) on the dielectric and grain‐boundary characteristics of copper titanate (CaCu 3 Ti 4 O 12 or CCTO) materials were studied with the comparison of conventionally prepared samples. HP at 1100°C in N 2 atmosphere resulted in uniformly distributed smaller grain sizes and less Cu‐rich grain boun…
Titania films have been grown on polycrystalline BaTiO 3 (BTO) substrates at 700°C by pulsed laser deposition. Electron backscatter diffraction (EBSD) was used to determine grain orientations in the substrate before growth, and the phase and orientation of the supported films after growth. All BaTiO 3 grains within 26…
The Eu 2+ ‐doped glasses and glass ceramics containing SrF 2 nanocrystals were prepared and their luminescence properties were investigated. The formation of SrF 2 nanocrystals in glass ceramics was confirmed by X‐ray diffraction and transmission electron microscopy. The melting in a reducing atmosphere and then the c…
The effects of the partial substitution of Mn by Co on the magnetic, magnetoelastic, and magnetocaloric properties of Ni50Mn35In15 Heusler alloys were studied using x-ray diffraction, temperature and field dependences of the magnetization [M(T,H)], and strain gauge techniques. It was observed that the presence of ≈3%…
Multiferroic solid solutions of (Pb0.8Sm0.2)(Ti0.8Fe0.2)O3 are synthesized by conventional solid-state reaction. Microstructure property relationship has been studied and it is shown that the multiferroic properties in the sample are dependent on sintering temperature. The sample sintered at 1200 °C exhibits optimal p…
The energy loss functions (ELFs) and optical constants of Si and SiO2 were obtained from quantitative analysis of reflection electron energy loss spectroscopy (REELS) by a new approach. In order to obtain the ELF, which is directly related to the optical constants, we measured series of angular and energy dependent RE…