Materials Literature
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Experimental progress is reviewed with emphasis on magnetic and transport studies. The magnetic results are fully consistent with the soliton doping mechanism; the decrease in Curie-law contribution has been demonstrated; the Pauli term remains small (Y < 0.07) and is apparently zero in the limit of completely uniform…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction between nitrogen oxide (NOx) and ammonia on iron oxide-titanium oxide catalystAkira Kato, Shimpei Matsuda, Tomoichi Kamo, Fumito Nakajima, Hiroshi Kuroda, and Tsuneo NaritaCite this: J. Phys. Chem. 1981, 85, 26, 4099–4102Publication Date (Print):December 1, 1981Publ…
1. The afferent responses evoked by mechanical and thermal stimulation of the cat cornea were recorded extracellularly from strands of long and mixed ciliary nerves under deep anaesthesia. 94% of the units studied (n = 53) responded consistently to both stimuli. 2. Conduction velocities, measured by electrical stimula…
Abstract Electron microscopy and electron diffraction studies show that polyethylene crystallizes epitaxially onto crystals of homologous series of (i) condensed aromatic hydrocarbons and (ii) linear polyphenyls. The contact planes of the PE chain‐folded lamellae with the (001) faces of the substrate crystals are foun…
The paper focuses on the establishment of the damage law consistent with the adopted physical interpretation of the damage. The model is developed within the framework of the general thermodynamics theory. In addition, the model incorporates a rigorous mathematical description of the damage growth kinematics including…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanide ion luminescence probes of the structure of biological macromoleculesWilliam D. Horrocks, Jr. and Daniel R. SudnickCite this: Acc. Chem. Res. 1981, 14, 12, 384–392Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inis…
A procedure for the refinement of the crystal unit cell from a powder diffraction scan is presented. In this procedure knowledge of the crystal structure is not required, and at the end of the refinement a list of indexed intensities is produced. This list may well be usable as the starting point for the application o…
A new Lagrangian formulation is introduced. It can be used to make molecular dynamics (MD) calculations on systems under the most general, externally applied, conditions of stress. In this formulation the MD cell shape and size can change according to dynamical equations given by this Lagrangian. This new MD technique…
The A g internal mode of the sulphate ion in potash alum is studied by Raman scattering as a function of temperature. This mode shows a splitting on account of the fact that a small fraction of S-O bonds point towards K + while a larger fraction point towards Al 3+ . The area under each peak is a measure of the number…
Earlier studies on the biodegradation of synthetic polymers were initiated by the desire to avoid biodegradation, thereby obtaining long lasting materials. Disposing of nondegradable synthetic polymers after use is a problem that grows more serious every day. Designing the polymer to be biodegradable avoids the proble…
An attempt is made to explain the first-order phase transition (180.4 degrees C) and the presence of an intermediate phase (180.4 degrees C-300 degrees C) between the para- and ferro-phases in lead phosphate, Pb 3 (PO 4 ) 2 , by invoking the basic ideas of the three-dimensional renormalised Potts model. This involves…
Ferroelectric domain walls have recently been considered as candidates for the occurrence of non-linear (soliton) excitations and roughening transitions. By means of X-ray or neutron scattering experiments, the domain walls may be observed directly and their width may be measured. The occurrence of a roughening transi…
Differential elastic scattering of electrons at 7.5, 10, 12.5, 15, 17.5 and 20 eV from neon is reported. The s, p, d and f phaseshifts derived from the measured cross sections are also presented.
The frequency ($f$) and temperature ($T$) dependent conductivity ($\ensuremath{\sigma}$) is reported for cis-${(\mathrm{CH})}_{x}$, trans-${(\mathrm{CH})}_{x}$, and ammonia-compensated ${(\mathrm{CH})}_{x}$. A strongly $T$-dependent dc $\ensuremath{\sigma}$ together with a weakly $T$-dependent ac $\ensuremath{\sigma}$…
The origin and nature of the two split-off conduction bands in V 2 O 5 is studied by means of a decoupled effective tight-binding Hamiltonian for the conduction band. This method is first shown to give reliable results, provided all interactions are taken into account and a first-order correction for the energy depend…
The authors present results of a dynamical simulation of UO 2 at high temperatures. The calculations confirm the occurrence of superionic oxygen conduction, but find that the level of disorder on the anion superlattice is low. The results, however, suggest there are exceptionally large, anisotropic thermal parameters…
Abstract Recent advances in microscope techniques have been used in a reinvestigation of the kinetics of the formation and the growth of nuclei developed during dehydration of cleaved (111) faces of relatively perfect crystals of the alums KAl(SO4)2. 12H2O and KCr(SO4)2. 12H2O , and solid solutions of five intermediat…
Two structural phase transitions in (CH3NH3)2, ZnCI4 at 426 and 484 K are discovered and investigated by X-ray diffraction, calorimetric, dielectric, thermal expansion, and optical measurements. The crystals are shown to be ferroelastic below 426 K. This behaviour is explained by a symmetry change Pnma-P21/a, which is…
Monophasic magnesium-nickel ferrites with varying amounts of magnesium and nickel are prepared and subjected to different heat treatments. The cation distribution in these compounds is calculated from magnetisation values assuming a collinear spin arrangement. The amount of Mg2+ on the A sites in magnesium rich compou…
In the temperature range from 848 to 1169 K chemical diffusion coefficients of Zn in α-Fe are given for Zn concentrations between 0 and 12 at%. Above 1068 K the tracer diffusion coefficient (nzn → 0) can be described by an Arrhenius law with D0 = 60 cm2 s−1 and Q = 262.6 kJ mole−1. For lower temperatures the diffusion…