Materials Literature
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The electrical assisted laser floating zone (EALFZ) solidification process makes the tailoring of fibre microstructures possible. The application of a dc electrical current of during the solidification process of Bi2Sr2Ca2Cu4O11 nominal composition fibres strongly modified phase development, crystal shapes and effecti…
Control of silicon carbide (SiC) polytype formation has been achieved. 3C, 2H, and 4H SiC heteroepitaxial films are fabricated on a sapphire (0001) substrate at a low temperature of 1100 °C using a pulsed-laser deposition (PLD) method. Images made by transmission electron microscopy clearly show that each film consist…
We have made ultrasonic measurements of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.35,$0.40,0.50) with the colossal magnetoresistance in order to investigate the lattice effects due to orbital and charge degrees of freedom in the systems. As a result, we observe three types of elastic…
We have developed a multisample film growth method on a temperature-gradient substrate holder to quickly optimize the film growth temperature in pulsed-laser deposition. A smooth temperature gradient is achieved, covering a range of temperatures from 200 to 830 °C. In a single growth run, the optimal growth temperatur…
The high-temperature transformation of ${\mathrm{CsH}}_{2}{\mathrm{PO}}_{4}$ was studied by means of impedance spectroscopy, differential thermal analysis, and thermogravimetric methods. The dielectric constant showed a high-temperature anomaly around ${T}_{p}=230\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}.$ The the…
The manganese oxo-cluster, [Mn 12 O 12 (O 2 CMe) 16 (H 2 O) 4 ]·2(HO 2 CMe)·4(H 2 O), (Mn-12), has been the subject of intense interest for its novel magnetic properties. Although it is a model system for nanoscale magnetic data storage, no methods for forming films or attaching the cluster to surfaces have been repor…
The room temperature magnetization of GaMnN films grown by molecular beam epitaxy on (0001) sapphire substrates with Mn concentrations varying from 0 to 9 at. % was found to depend on Mn concentration, with a maximum magnetization found at ∼3 at. % Mn. High-resolution x-ray diffraction measurements show that the c-pla…
A new beamline (MPW6.2) has been designed and built for the study of materials during processing where three synchrotron techniques, SAXS, WAXS and XAS, are available simultaneously. It has been demonstrated that Rietveld refinable data can be collected from silicon SRM 640b over a 60 degrees range in a time scale of…
The use of nonmagnetic drill collars for the oilfield industry started in the seventies and eighties of the last century with a change in drilling technology. Since then, nonmagnetic Cr-Mn-N steels...
Resonance Raman excitation profiles and absolute cross sections are presented for three closely related merocyanine dyes as monomers in dichloromethane solution and as H-dimers in dioxane solution. For both monomers and dimers the absorption spectra and the resonance Raman intensities of the 24 to 30 strongest vibrati…
ITO layers with low resistivity and high visible transmittance were produced by means of middle frequency reactive dual magnetron sputtering. The influence of base pressure, Ar/O2 ratio and magnetron pulse duration on the film composition, structure, electrical, and optical properties has been investigated. The deposi…
Intense red luminescence in Eu3+-doped gamma (γ) and alpha (α) alumina (Al2O3) phosphors obtained by direct and indirect combustion synthesis at low-temperatures is reported. γ and α-(Al1−xEux)2O3 are easily produced by combustion synthesis at 280 °C in the range of x=0.001–0.06 at. %. The well-defined direct synthesi…
Thermal chemical vapor deposition at temperatures as low as 423 K, using Ru3(CO)12 with no accompanying reactive gas, forms pure, uniform, and smooth Ru films on Ta and low-resistivity films on SiO2. A 2.5-nm-thick Ru film fully covers the underlying Ta and the Ru film is thermally stable up to 573 K. Unlike Ta, Ru fi…
This paper describes the commissioning and characterization of an SRS bending-magnet beamline constructed for the measurement of vacuum-ultraviolet circular dichroism on biological and other materials. The beamline provides photon fluxes of many orders of magnitude greater than commercial instruments or beamlines at o…
Thermodynamic characteristics of single crystalline $\mathrm{Pb}({\mathrm{Zr}}_{0.52}{\mathrm{Ti}}_{0.48}){\mathrm{O}}_{3}$ (PZT) were investigated using c-axis oriented PZT films. The PZT films were epitaxially grown on Pt/MgO substrate and dielectric and ferroelectric properties were measured as a function of one-di…
Temperature and magnetic field dependent magnetization and heat capacity of polycrystalline ${\mathrm{Gd}}_{5}{\mathrm{Ge}}_{4}$ have been measured. In addition to the antiferromagnetic ordering observed at the N\'eel temperature, ${T}_{N}=128\mathrm{K},$ there is a cusp at $\ensuremath{\sim}17.5\mathrm{K}$ in the low…
Carbon-coated nanocrystalline MgO samples were prepared by butadiene pyrolysis at 500 °C over aerogel-prepared MgO samples. Samples with carbon loadings of 1.2, 3.2, 5.0, 10.0, and 15.9 wt % were prepared. Initial carbon formation rate was about 2 wt % per hour. According to HRTEM, the structure of the mineral compone…
The structural and magnetic properties of the metastable hexagonal ${\mathrm{SmFe}}_{9\ensuremath{-}x}{\mathrm{Si}}_{x}\mathrm{C}$ compounds, where x is 0.25, 0.5, 0.75, and 1, have been investigated by means of powder x-ray diffraction, Curie temperature, magnetic moment and coercivity measurements, iron-57 M\"ossbau…
We report detailed Raman and photoluminescence (PL) measurements in Si/Si1−xGex nanostructures grown by molecular-beam epitaxy under conditions of near Stranski–Krastanov (S-K) growth mode. In a series of samples with x controllably increased from 0.098 to 0.53, we observe that an increase in Raman signal related to G…
Gold(III) porphyrins of the type (P-R)AuPF(6), where P = 5,10,15,20-tetrakis(3,5-di-tert-butylphenyl)porphyrin and R is equal to H (1), NO(2) (2), or NH(2) (3) which is substituted at one of the eight beta-pyrrolic positions of the macrocycle, were investigated as to their electrochemistry and spectroelectrochemistry…