Materials Literature
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The first order anisotropy constants K u1 of the recently found tetragonal rare earth-iron borides R 2 Fe 14 B (P4 2 /mnm) have been measured for R=Y, Ce, Pr, Nd, Gd, Tb, Dy and Ho in a magnetic field up to 1600 kA/m from 4.2 K to about 600 K on single crystal samples.
We studied various properties of nonallophanic Andosols in Japan. Our results showed that, despite many similarities between nonallophanic and allophanic Andosols, significant dissimilarities also exist between the two groups of soils. The nonallophanic Andosols used for our study formed from rhyolitic, dacitic, or an…
Laser action at 530 nm using H3 centers in diamond was observed with an efficiency of 13.5% at room temperature. Optical double-resonance experiments on N3 centers provided direct evidence for a (2)A metastable level. Its presence results in rapid decay of the excited (2)E state and low quantum efficiency as well as s…
The first self-consistent spin-polarised band-structure calculation of the ferromagnetic compound MnBi in its low-temperature phase has been performed. The spin-orbit interaction was treated as a perturbation using scalar-relativistic wavefunctions. On the Mn atoms an effective 3d 5.5 configuration is found, with a ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on the electronic structure of metalloporphyrins: a quantitative analysis in terms of four-orbital-model parametersJ. A. Shelnutt and V. OrtizCite this: J. Phys. Chem. 1985, 89, 22, 4733–4739Publication Date (Print):October 1, 1985Publication History Publ…
This paper gives a brief survey over some recent work on surface coatings for energy efficiency and solar applications. Specifically, it covers coatings for - selective absorption of solar energy (for solar collectors), - selective emission of infrared radiation in the 8-13 μm range (for passive cooling devices), - vi…
We examine a quantum mechanical model for the enhancement of fluorescence yield and photochemical rates by the presence of small particle capable to sustain electromagnetic resonances. The sphere lowers the absorption and emission efficiency by taking energy from the molecule and storing it into nonradiative modes, en…
Pb(Zr 0.525 Ti 0.475 )O 3 piezoceramics, both unmodified and doped with 2 wt% Bi 2 O 3 or Nb 2 O 5 , were prepared by the usual techniques, using sintering temperatures from 900° to 1250°C. The microstructural data showed that the sintering temperature which produces minimum porosity is altered by the oxide additions.…
By neglecting certain terms in the Hamiltonian (of importance only in the immediate neighbourhood of the threshold energy) we are able to write an exact expression for the photoemission intensity which involves the standard time inverted LEED state and broadened hole-states. If inelastic extrinsic losses are neglected…
Isothermal demixing process of binary polymer mixtures of SBR (styrene–butadiene random copolymer) and polybutadiene at deep quench depths was investigated by time-resolved light scattering technique. The results indicated that the systems undergo extremely slow spinodal decomposition of the type as adequately charact…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetracyclo[5.1.0.01,6.02,7]octane, a [1.1.1]propellane derivative, and a new route to the parent hydrocarbonKlaus Semmler, Guenter Szeimies, and Johannes BelznerCite this: J. Am. Chem. Soc. 1985, 107, 22, 6410–6411Publication Date (Print):October 1, 1985Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectra of cis- and trans-azobenzenes: consequences of ortho substitutionChristine L. Forber, Eric C. Kelusky, Nigel J. Bunce, and Michael C. ZernerCite this: J. Am. Chem. Soc. 1985, 107, 21, 5884–5890Publication Date (Print):October 1, 1985Publication History Pub…
The crystal structures of ZrO 2 and HfO 2 (P2 1 /c) were refined in detail from X‐ray powder diffraction data. The precision obtained for the atom positions for both compounds is comparable to that of previous single‐crystal work.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe nature of the nonframework aluminum species formed during the dehydroxylation of H-YR. D. Shannon, K. H. Gardner, R. H. Staley, G. Bergeret, P. Gallezot, and A. AurouxCite this: J. Phys. Chem. 1985, 89, 22, 4778–4788Publication Date (Print):October 1, 1985Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray scattering from poly(thiophene): crystallinity and crystallographic structureZ. Mo, K. B. Lee, Y. B. Moon, M. Kobayashi, A. J. Heeger, and F. WudlCite this: Macromolecules 1985, 18, 10, 1972–1977Publication Date (Print):October 1, 1985Publication History Published onli…
Calculations of bulk and surface defect energies were used to develop a model of the grain structure of doped BaTiO 3 , Segregation processes are expected as a consequence of thermo‐dynamic and kinetic factors and result in the development of n‐i‐n junctions at intergranular contacts, thus leading to the observed PTCR…
The relationship between short-range icosahedral order in metallic glasses and long-range order in icosahedral crystals is explored. Metallic-glass structure factors are assumed to describe liquids in metastable equilibrium just above the glass transition. A density-functional mean-field theory is then used to search…
The structure and properties of thin amorphous carbon films are critically dependent upon the preparation conditions. Hydrogenated amorphous carbon films, prepared by both ion beam sputtering and glow discharge techniques, have been investigated by solid-state 13C magic angle spinning nuclear magnetic resonance measur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimerization and stacking in transition-metal bisdithiolenes and tetrathiolatesSantiago Alvarez, Ramon Vicente, and Roald HoffmannCite this: J. Am. Chem. Soc. 1985, 107, 22, 6253–6277Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Publis…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More