Materials Literature
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The temperature dependence of the phonon-activated d.c. conductivity is calculated for quasi one- and two-dimensional systems. For a one-dimensional system it is shown that the behaviour of σ(T) depends on the length of the chains and one obtains 1n σ = 1n σ0 − (T 0/T)I/n where n is 1 or 2, depending on temperature ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectra of zirconium(IV) fluoride complex ions in fluoride melts and polycrystalline solidsL. M. Toth, A. S. Quist, and G. E. BoydCite this: J. Phys. Chem. 1973, 77, 11, 1384–1388Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Publishe…
The corrosiveness of several chemically prepared iron sulphides to mild steel has been studied with regard to the amount of sulphide and the period of exposure of the steel to the sulphide. All sulphides examined were found to be corrosive and there appears to be a link between corrosiveness and the sulphur content of…
can be determined from isothermal crystallization experiments for a series of random copolymers of varying composition.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemoval of oil from water surfaces by sorption on unstructured fibersRobert F. Johnson, Tulsidas G. Manjreker, and James E. HalliganCite this: Environ. Sci. Technol. 1973, 7, 5, 439–443Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the oxidation of hexaaquoiron(2+) by polypyridine complexes of ruthenium(III). Negative enthalpies of activationJames N. Braddock and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1973, 95, 10, 3158–3162Publication Date (Print):May 1, 1973Publication History Publis…
Abstract Mit Hilfe von röntgenographischen Einkristalluntersuchungen wurde bestätigt, daß die Verbindungen TlGaTe 2 , TlInSe 2 und TlInTe 2 im TISe‐Typ (B37) kristallisieren. Thallium ist darin als 1wertiges Kation von acht Chalkogenatomen umgeben, Gallium und Indium liegen 3wertig mit tetraedrischer Koordination und…
Clostridium thermoaceticum ferments xylose, fructose, and glucose with acetate as the only product. In fermentations with mixtures of the sugars, xylose is first fermented, then fructose, and last, glucose. Fructose inhibits the fermentation of glucose, and this inhibition appears to be due to a repression of the synt…
A two-dimensional polyacrylamide gel electrophoresis technique is presented for separation of acid-extracted proteins of isolated nucleoli of normal rat liver and Novikoff hepatoma ascites cells. About 100 distinct protein spots were resolved. Comparison of the patterns for normal liver and Novikoff hepatoma revealed…
Abstract The transformation of vaterite to calcite was investigated systematically. The transition temperature and the energetics of the transformation were determined from differential thermal curves. The variations of lattice constants and crystallite size, accompanying the transformation were studied by X-ray diffr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPulse radiolytic study of the site of hydroxyl radical attack on aliphatic alcohols in aqueous solutionK. D. Asmus, H. Moeckel, and A. HengleinCite this: J. Phys. Chem. 1973, 77, 10, 1218–1221Publication Date (Print):May 1, 1973Publication History Published online1 May 2002P…
It is shown that the angular distribution of back-scattered electrons can be observed in a scanning electron microscope, and that the patterns observed can be used to obtain crystallographic information about the specimen. The patterns are termed electron back-scattering patterns (E.B.S.P.). The use of these patterns…
Bond-strength-bond-length relationships for bonds between oxygen and H+, Li+, Be2+, B3+, Na+, Mg2+, Al3+, Si4+, P5+, S6+, K+, Ca2+, Sc3+, Ti4+, V5+, Cr6+, Mn2+, Fe3+, Fe2+, Co2+, Cu2+, Zn2+, Ga3+, Ge4+ and As5+ have been derived by requiring that the sums of the bond strengths around the cations be equal to their vale…
This paper provides a brief introduction to the theory and practice of low-energy electron diffraction, a tcchnique which is proving useful for investigating the structure of surfaces. Emphasis is given to clean well-defined surfaces which are studied also with Auger electron spectroscopy and under conditions of ultra…
N F Mott and E A Davis London: Oxford University Press 1971 pp xiii + 437 price £7·50 It is hard to think of a physicist other than Professor Mott who would be able to attempt successfully a book of such a broad compass and in Dr Davis, a specialist in the field of amorphous semiconductors, he has found an ideal co-au…
This work centers on the now disputed interpretation of the observed ${T}^{\ensuremath{-}\frac{1}{4}}$ dependence of the conductivity in amorphous group-IV semiconductors by hopping near the Fermi energy. We find the arguments against this interpretation inapplicable. We present experimental results of the temperature…
The conductivity of gas-free thin films of amorphous germanium was measured as a function of temperature and film thickness. Existing theories of hopping conduction have been modified to apply to very thin films. The results are consistent with experiment, indicating that hopping conduction near the Fermi energy is th…
A review is presented of the status of problems involving the interaction of matter and optical-band electromagnetic radiation of intensity such that any medium becomes a fully ionized plasma. The following are considered within the framework of the single-electron approximation in the case of nonrelativistic energies…
The alimentary and vascular systems are discussed. The "alimentary prosopon" of polymerid trilobites is thought to show the course of the superficial dorsal vascular system. The arrangement of segments in the cephalon and thorax is investigated. Evidence of six cephalic segments is found. The articulation and enrollme…
The ferroelectric and antiferromagnetic orthoferrite BiFeO 3 has been studied extensively using the Mossbauer effect technique. The sublattice magnetization data are not in agreement with those previously published but do agree with data for other orthoferrites and for iron oxides in general. The several phase transit…