Materials Literature
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Optical band gaps, ${E}_{g}$, up to 0.5 eV higher than in single-crystal samples, are observed for chemically deposited films of CdSe and explained in terms of a quantum-size effect, whereby the electrons are localized in individual crystallites. The increase in ${E}_{g}$ depends strongly on deposition temperature, wi…
The relative viscosities at 25°C of solutions containing 12% wt/vol poly(vinylbutyral) in pure methanol (MeOH), 1:1 methyl iso-butyl ketone (MIBK)/MeOH by volume and 9:1 MIBK/MeOH were in the ratio 1.0:0.9:4.3, respectively. The apparent activation energy for flow was 20 kcal/mol in the latter solution and only 8 kcal…
An analysis has been made of Angstrom's method for the measurement of the thermal diffusivity of solids when the length of the sample is short and when the end remote from the periodic heat source is thermally isolated. The results of the analysis have been applied to experimental data obtained from a short specimen o…
Absolute differential cross sections sigma ( theta ) for elastic electron scattering from mercury atoms were measured in the energy range from 25 to 300 eV at scattering angles up to 135'. The smallest scattering angles were 2 and 7' at 300 and 25 eV, respectively. A target cell was used in which the pressure could be…
Hydrogenated amorphous boron films have been produced by a toroidal glow discharge of B2H6/He mixtures at low pressures (10−2 Torr). Chemically stable pure films with a low hydrogen content can be formed at a moderate substrate temperature (∼200 °C) when the diborane flow rate is raised above 10 sccm with the discharg…
The theory of forming a coherent twinning array in a parent phase is studied for a tetragonal to orthorhombic displacive transition. We find that this structure can be stabilized without the use of dislocations by a long-range interaction between the twin boundaries which is mediated via the parent phase. The dynamics…
Thin films of Y-Ba-Cu-O superconductors on (100) SrTiO3 were prepared using the pulsed excimer laser evaporation technique. After an annealing treatment in oxygen the films exhibited superconductivity with zero resistance at 85 K with transition widths (90%–10%) as narrow as a 2 K. A considerable amount of orientation…
A general review of conventional magnetic shielding is presented. Several possible definitions of the term 'shielding factor' are given, taking into account the ferromagnetic nature of shielding materials. An alternative treatment of single-layer axial shielding for a cylindrical shield is presented and compared to a…
In order to characterise the interplay between quasiperiodicity and order in one dimension, the authors consider sequences of 0 and 1 generated by a circle map. These sequences, which generalise the Fibonacci sequence, describe the quasiperiodic ordering of atoms and vacancies on a line. They study in a quantitative w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompressibility and high-pressure phase transition of a metalloporphyrin: (5,10,15,20-tetraphenyl-12H,23H-porphinato)cobalt(II)Robert M. Hazen, Thomas C. Hoering, and Anne M. HofmeisterCite this: J. Phys. Chem. 1987, 91, 19, 5042–5045Publication Date (Print):September 10, 19…
The electronic band structures of cubic and tetragonal iron monosulphide have been obtained for self-consistent linear muffin-tin orbital calculations within the atomic sphere and local density approximations. The Fe-S bond is seen to be mainly ionic with little covalent mixing. In calculations excluding spin polarisa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynergy in N-ethylformamide dehydration by mixtures of molybdenum trioxide and antimony oxide (.alpha.-Sb2O4)B. Zhou, S. Ceckiewicz, and B. DelmonCite this: J. Phys. Chem. 1987, 91, 19, 5061–5067Publication Date (Print):September 10, 1987Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron pairing in dilute liquid metal-metal halide solutionsA. Selloni, R. Car, M. Parrinello, and P. CarnevaliCite this: J. Phys. Chem. 1987, 91, 19, 4947–4949Publication Date (Print):September 10, 1987Publication History Published online1 May 2002Published inissue 10 Sep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical effects on the optical properties of semiconductor particlesY. Wang and N. HerronCite this: J. Phys. Chem. 1987, 91, 19, 5005–5008Publication Date (Print):September 10, 1987Publication History Published online1 May 2002Published inissue 10 September 1987https://pubs…
Microcrystals and microcrystalline films of diamond were prepared on molybdenum substrates in a thermal plasma which was produced by rf inductive heating in an argon-hydrogen-methane mixture gas under 1 atm pressure. The deposition rate amounted to 1 μm/min.
Measurements of the self-diffusion coefficient in supercooled water to 300 MPa are reported. Translational diffusion in liquid water at 243 K is enhanced by 60% when the pressure is increased from 0.1 to 150 MPa, and rotational diffusion is enhanced by almost 250% between 0.1 and 250 MPa. These striking anomalies are…
The ferromagnetic resonance (FMR) and infrared spectra (IR) of polycrystalline MnZn ferrite have been studied for samples with high permeability (∼10000) and low permeability (∼4000) values to investigate the origin of physical processes which result in permeability enhancement. Two resonance peaks are observed for al…
The relationship between tensile elongation and acoustic emission (AE) detected during compressive deformation of Al-Li and Al-Li-Zr alloys has been investigated for a range of microstructure. For comparison, AE measurements have been carried out for Al-Cu and commercial 7050 alloys. In the polycrystalline binary Al-L…
Abstract Reaction of UO2F2 with UF5 at 400 °C under UF6-pressure of 3 atm followed by evaporation of excess UF5 has yielded a greenish white residue. Its X-ray diffraction pattern and infrared spectrum are sufficiently unique to establish that this material is a true compound. Its chemical formula has been shown to be…
Abstract Lattice constants of sodium chlorate and sodium bromate and their mixed crystals were determined over the temperature range from room temperature to 320 °C. The observed lattice constants for the various compositions show strong deviations from those expected from Vegard's rule. The lattice constants at vario…