Materials Literature
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We examined the effect of radiation damage and annealing on the optical properties of nitrogen-gettered nearly IIa type synthetic diamonds. It was found that the 2.156 eV centre, whose absorption is usually very weak, appears in these diamonds as one of the dominant absorption features. A new vacancy-related vibronic…
Over a wide crystallization temperature ( T c ) range, elongated rectangular lamellar single crystals of syndiotactic polypropylene (s-PP) grown from the melt of thin films exhibit sectorization along both diagonal directions to form the (010) [with the (010) free edge] and the (100) [with the (100) free edge] sectors…
Changes in the hydroxyl surfaces of potassium-acetate-intercalated kaolinite have been studied over the ambient to predehydroxylation temperature range using a combination of X-ray diffraction (XRD) and Raman spectroscopy. Upon intercalation, the kaolinite expanded along the c -axis direction to 13.88 Å. When the inte…
An investigation was made of the sodium lithium niobate Na 0.85 Li 0.15 NbO 3 ceramics using permittivity properties. Permittivity measurements were carried out by impedance spectroscopy in a frequency range of 5 to 1.3×10 7 Hz and at temperatures ranging from 25 to 750 °C. The thermal stability of the dielectric beha…
We studied the crystallization of lysozyme solutions by adding sodium chloride at pH = 4.5, 5.9 and 7.8. A universal crystallization boundary is found if data are scaled according to the salt concentration normalized by the square of the charge at the appropriate pH. Calculations show that this finding is consistent w…
In this paper, we present the design and test performance of the COMICS, the mid-IR instrument for the 8.2 m Subaru Telescope at Mauna Kea. The instrument has both imaging and long slit grating spectroscopy capabilities in the 8-26 micrometers wavelength range. In the camera section, there are selectable three sets of…
Poly(amidoamine) dendrimers having various degrees of modification with the redox-active ferrocenyls were prepared by controlling the molar ratio of ferrocenecarboxaldehyde to amine groups of dendrimers. By alternate layer-by-layer depositions of partial ferrocenyl-tethered dendrimers (Fc-D) with periodate-oxidized gl…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAmplified Fluorescence Quenching in a Poly(p-phenylene)-Based Cationic PolyelectrolyteBenjamin S. Harrison, Michael B. Ramey, John R. Reynolds, and Kirk S. SchanzeView Author Information Department of Chemistry and Center for Macromolecular Science and Engineering Univ…
The effect of Fe doping in the Mn site on the magnetic, transport and structural properties of polycrystalline La1/2Ca1/2MnO3 was studied. Doping with low Fe concentration (< 10%) strongly affects electrical transport and magnetization. Long range charge order is disrupted even for the lowest doping level studied (~2%…
Relaxation schemes for finding normal modes of nonlinear excitations are described, and applied to the vortex-spinwave scattering problem in classical two-dimensional easy-plane Heisenberg models. The schemes employ the square of an effective Hamiltonian to ensure positive eigenvalues, together with an evolution in ti…
The Optical System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS) will be a Day-One instrument of the Spanish 10.4 m telescope Gran Telescopio Canarias, whose first light is planned for 2002. GTC will be installed at the Observatorio del Roque de los Muchachos in La Palma, Spain. OSIRIS three primary…
From the order-N electronic-structure formulation, a Hamiltonian is derived, of which lowest eigen state is the generalized or composite-band Wannier state. This Hamiltonian maps the locality of the Wannier state to that of a virtual impurity state and to a perturbation from a bonding orbital. These theories are demon…
The reflection properties of 300 nm periodically structured silicon surfaces with depth varying between 35 and 190 nm, prepared by interference lithography, were examined in the range 200 nm<λ<3000 nm. A decrease in the reflectivity that becomes stronger with increasing structure depth is observed below 1000 nm. This…
Siting of copper ions in Cu I −Y zeolite, prepared by gas-phase exchange of NH 4 −Y with CuCl, has been investigated employing XRPD, XAS and IR spectroscopies. An X-ray powder diffraction study of the zeolite in a vacuum shows that 23.4(2) cuprous ions are located at site I*, 6.1(3) at site II, and 11.5(3) at site II*…
Nanostructured ZnFe 2 O 4 ferrites with different grain sizes were prepared by high energy ball milling for various milling times. Both the average grain size and the root mean square strain were estimated from the x-ray diffraction line broadening. The lattice parameter initially decreases slightly with milling and i…
The ${\mathrm{Cu}}_{2}\mathrm{O}$ film is epitaxially grown on air-cleaved MgO(001) by dc-reactive magnetron sputtering. From the reflection high-energy electron diffraction patterns two orientations are identified: (I) ${\mathrm{Cu}}_{2}\mathrm{O}(001)\ensuremath{\Vert}\mathrm{MgO}(001)$ and ${\mathrm{Cu}}_{2}\mathrm…
Oil and gas pipelines often display a bulk magnetic easy magnetization direction, and this may influence results obtained during magnetic nondestructive evaluation. The origin of this magnetic easy axis is not well known. Earlier work [L. Clapham, C. Heald, T. Krause, and D. L. Atherton, J. Appl. Phys. 86, 1574 (1999)…
In situ crystalline lead zirconate (PZ) thin films were deposited on platinum metallized silicon substrates, using a 248 nm KrF pulsed excimer laser ablation technique. The antiferroelectricity in PZ thin films was confirmed by means of P vs E and C vs V measurements. The maximum observed saturated polarization (Ps) w…
We present a spectroscopic ellipsometry study of the optical anisotropies at energies above and below a crossing point at $\ensuremath{\approx}2$ eV in the optical conductivity of ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ crystals. Below ${T}_{\mathrm{co}},$ we observe a sudden increase of…
The ferromagnetic oxide ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ has been studied by magnetic circular x-ray dichroism (MCXD) in core-level absorption. In the Co ${2p}_{3/2,1/2}$ absorption, the orbital and spin magnetic moments of the Co $3d$ are deduced with the use of magneto-optical su…