ChemInform Abstract: OPTICAL ABSORPTION OF THE TRANSITION ELEMENTS IN VITREOUS SILICA
Abstract Die optische Absorption von 3d‐Übergangselementen in geschmolzenem SiO, wird untersucht.
Materials Literature
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Dielectric Response of a Superionic Conductor
A microscopic theory of ionic transport in superionic conductors is presented. Based on a liquidlike description of the ionic carriers, it describes the frequency and temperature dependences of the conductivity. A sum rule is obtained and the theory predicts the existence of a conductivity peak which scales with the i…
Effect of Eccentricity of Anodes in Accelerating Lens for Field Emission Scanning Electron Microscope
The influence of the eccentricity of electrostatic lenses on the spot size is analytically formulated and is numerically evaluated for the Butler type lens and the three anodes accelerating lens. For the aperture size which gives the minimum spot size, it is found that the misalignment less than 100 µm between the ano…
Inelastic scattering in slow-ion surface-channeling and surface Debye temperature
Electronic and nuclear inelastic scattering in surface channeling are studied in detail for slow ions. The transition probability of inelastic scattering is obtained as a function of the position (measured from the first atomic layer) and the scattering angle. As an example, we calculate 10- and 100-keV ${\mathrm{H}}^…
DISSOCIATION AND PLASTICITY OF LAYER CRYSTALS
The deformation process in an ideal layer crystal proceeds exclusively by dislocations gliding along the basal plane. No tangling of the dislocations is expected. Structural defects present before deformation are responsible of hardening and work hardening. This is the case for Frank dislocation loops and non-basal gr…
Kaolinite clayrocks in the Triassic Banks Wall sandstone of the western blue mountains, New South Wales
Fine‐grained and coarsely oolitic kaolinite clayrocks that closely resemble in composition, texture, and structure those of the Garie Formation in the southern part of the Sydney Basin are described from the Western Blue Mountains of New South Wales. The kaolinite clayrocks form part of a fine‐grained unit, here desig…
Culture of Clostridium pasteurianum in Defined Medium and Growth as a Function of Sulfate Concentration
Clostridium pasteurianum strain W-5 was selected as an anaerobe which may be grown from large inocula in defined media with sulfate as its primary sulfur source. Since it is important to keep inocula small in minimizing transfer of sulfur sources, culture conditions were optimized. The medium devised decreased lag per…
Structure cristalline de l'ultraphosphate de calcium: CaP4O11
Article Structure cristalline de l'ultraphosphate de calcium: CaP4O11 was published on December 1, 1974 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 140, issue 3-4).
HIGH SPIN-LOW SPIN TRANSITION IN SUBSTITUTED PHENANTHROLINE COMPLEXES OF IRON (II)
The magnetic behaviour of [FeIIL3] (ClO4)2, L=2-CH3-phen (phen = 1,10-phenanthroline) (I), 2-CH3O-phen(II), 2-Cl-phen(III), and 2,9-bis(CH3)-phen(IV), has been examined in the temperature range 300-4.2 K using the Mössbauer effect technique. The α-substituent in the ligand influences strongly the magnetic behaviour. C…
Bridged polyaromatics: Synthesis, structure, and isomorphous properties of methyl‐substituted polymers containing CH2, O, and S bridges
Abstract Linear, crystalline polymers corresponding to the general formulas magnified image where X is CH 2 , O, or S, were synthesized, and their isomorphous relationships were studied. The results point out that a close structural relationship exists within each series of compounds investigated.
TWINNING AND MARTENSITIC TRANSFORMATION
Both deformation twinning and martensitic transformation may be regarded as modes of deformation, and models which relate the nucleation and growth of twins and martensite plates to dislocations and stacking faults are reviewed. Recent experimental and theoretical work indicates that b. c. c. twins mays originate from…
Magnetic hysteresis model
A dynamical model is described which permits calculation of the excitation currentIas a function of time in a laminated grain-oriented (G-O) steel transformer core. The independent variable is the magnetic flux density or, equivalently, the coil voltage less theIRdrop associated with the resistanceRof the windings. Re…
Nature of the interaction forces associated with the concentration fluorescence quenching of Nd3+ in silicate glasses
The nature of the concentration fluorescence quenching of Nd3+ in silicate glasses, which is associated with the reaction Nd3+ (4F3/2) + Nd3+ (4I9/2) → 2Nd3+ (4I15/2), has been reinvestigated by monitoring the fluorescence intensity of Nd3+ at 1060 nm as a function of time. The experimental decay curves were compared…
The theory of two‐phase interfacial structure
SUMMARY The theory of interfaces between crystals of different structure and/or composition is briefly reviewed. The review is limited to planar semi‐coherent interfaces with an abrupt transition from one crystal to the other. Equilibrium, obeying minimum ( free) energy requirements, is introduced as a governing princ…
Binuclear Metal Complexes. XIII. Syntheses and Magnetic Properties of Thiocyanato-Bridged Binuclear Copper(II) Complexes
Abstract Three binuclear copper(II) complexes, Cu2(fsal-NMe2)(NCS)3, Cu2(fsal-NEt2)(NCS)3 and Cu2(fsal-pa)(NCS)3, have been synthesized and characterized, where Hfsal-NMe2, Hfsal-ENt2 and Hfsal-pa denote the Schiff bases prepared by the condensation reaction of 2,6-diformyl-4-methylphenol with N,N-dimethylethylenediam…
Neutron resonance spectroscopy: Fluorine
Results are reported of high resolution transmission measurements on Teflon, ${(\mathrm{C}{\mathrm{F}}_{2})}_{n}$, for the total cross section of natural fluorine vs energy from 500 eV to 200 keV. This region has three strong $l=1$ levels which were fitted using a multilevel $R$-matrix analysis. The best fit (${E}_{0}…
Structural changes in glassy poly(ethylene terephthalate)
Structural changes in glassy poly(ethylene terephtbalate) and their effects on its crystallization, melting, and various properties were studied. Quenched, annealed below Tg, crystallized, and drawn samples were studied using calorimetry, wide-and small-angle X-ray diffraction, mechanical spectroscopy, and stress-stra…
Cristallochimie du sélénium(+IV). II. Structure cristalline de ZnSe2O5
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Auger electron spectroscopy study of cathode surfaces during activation and poisoning. I. The barium-on-oxygen-on-tungsten dispenser cathode
Auger electron spectroscopic analyses of the chemical changes taking place on a commonly used dispenser cathode have been carried out during activation and poisoning by several reactive gases (O2, CO, CO2, H2, N2, Ar). The chemical composition and work-function changes on the cathode were correlated at various stages…
The Effect of Chromium on the Photosynthesis and Growth of Diatoms and Green Algae
Abstract The effect of hexavalent chromium ions on the photosynthesis and growth of the diatom Nitzschia palea and the green alga Chlorella pyrenoidosa has been studied and compared with the effect of Cu and Hg. The effect of chromium is very similar to that of Cu and Hg, but it is more than one hundred times less tox…