Materials Literature
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The effects of electron beams on the composition of ion bombarded calcium fluoride surfaces have been studied with Auger electron spectroscopy (AES), electron loss spectroscopy (ELS), and x-ray photoelectron spectroscopy (XPS). It was found with AES that when using typical AES excitation electron-beam parameters (5 ke…
A theory of angle-resolved photoemission from the surface of a random alloy is described. It is argued that this theory contains a proper treatment of the disorder (via the Korringa-Kohn-Rostoker coherent potential approximation, KKR CPA), the surface, the LEED-type final state, and the electron-photon matrix elements…
We report a high-resolution heat-capacity and x-ray study of the nematic---smectic-$A$ transition in the single-layer smectic material butyloxybenzylidene octylaniline (40.8). We find that the transition is second order to within 3 mK, with critical behavior closely similar to that observed previously in bilayer smect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of metallo and metal-free octaalkylphthalocyanines and uranyl decaalkylsuperphthalocyaninatesEdward A. Cuellar and Tobin J. MarksCite this: Inorg. Chem. 1981, 20, 11, 3766–3770Publication Date (Print):November 1, 1981Publication History Publish…
The microstructural influence on the PTCR effect in semiconducting barium titanate ceramics was studied and a method for preparing the ceramic bodies exhibiting a PTCR effect of more than seven orders of magnitude was established. Commercial barium titanyl oxalate was used as a starting material and Sb 2 O 3 was added…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroreductive alkylation of iron in porphyrin complexes. Electrochemical and spectral characteristics of .sigma.-alkylironporphyrinsDoris Lexa, Joel Mispelter, and Jean Michel SaveantCite this: J. Am. Chem. Soc. 1981, 103, 23, 6806–6812Publication Date (Print):November 1,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility of the poly(hydroxy ether) of bisphenol A with water-soluble polyethersL. M. Robeson, W. F. Hale, and C. N. MerriamCite this: Macromolecules 1981, 14, 6, 1644–1650Publication Date (Print):November 1, 1981Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular vibrational energy redistributionPaul R. Stannard and William M. GelbartCite this: J. Phys. Chem. 1981, 85, 24, 3592–3599Publication Date (Print):November 1, 1981Publication History Published online1 May 2002Published inissue 1 November 1981https://pubs.acs.or…
J C H Spence 1981 Clarendon Press: Oxford University Press x + 370 pp price £35 The author has provided us with an excellent and readable review of the fundamental principles of high resolution electron microscopy. He has, however, managed to combine his theoretical treatment with a discussion of the pitfalls for the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer spectra of metallophthalocyanines: correlation with electrode potentialsA. B. P. Lever, S. R. Pickens, P. C. Minor, S. Licoccia, B. S. Ramaswamy, and K. MagnellCite this: J. Am. Chem. Soc. 1981, 103, 23, 6800–6806Publication Date (Print):November 1, 1981Publi…
The visible and near infrared luminescence spectra of MoCl6 3- in Cs2NaMCl6 (M=Sc, Y, In) and MoBr6 3- in Cs2NaYBr6 have been measured between 15 000 cm-1 and 3000 cm-1 at liquid helium temperatures. Comparison with new electronic absorption, infrared and Raman spectra have enabled five luminescence transitions betwee…
The effects of surface insulating coatings on magnetic properties in commercial highly grain oriented Si-Fe sheets are shown on the basis of domain observation using a high voltage SEM. The average 180° wall spacing in grain oriented Si-Fe sheets with the coatings could be expressed semiempirically as a function of ti…
Abstract By 1 H‐NMR spin‐echo spectroscopy the self‐diffusion coefficients D te of almost spherical test molecules—Sn(CH 3 ) 4 , Si(OCH 3 ) 4 , Ti(O t Bu) 4 , and SnOct 4 —in the solvents—CCl 4 , Si(OCD 3 ) 4 , and Si(O 1 Pr) 4 ‐d 28 —were studied as a function of temperature and concentration.—The excess volumes of t…
Electrical conductivity and thermoelectric power measurements on pure and Li‐substituted Co 3 O 4 were performed at 200° to 900°C. Impurity‐induced p‐type semiconduction was observed at low temperatures and intrinsic behavior at high temperatures. A hopping scheme for electron hole conduction was confirmed, and site e…
The total power loss under alternating flux at power frequencies and zero applied stress conditions is an important criterion for the manufacturer and user of soft magnetic materials. The total power loss may be divided into three major types, namely the static hysteresis loss, classical eddy current loss and excess e…
During ageing, proteinaceous media undergo various chemical and structural alterations to acquire new physico-chemical properties. The action of light, oxygen and interactions between mixed media components are discussed. The influence of some conservation treatments is considered.
The centers [AlO 4 /M + ] + , formed in α-quartz by X-irradiation at 77 K, contain an aluminum ion substituted for a silicon ion, with an electron removed from a neighboring oxygen by the ionizing radiation. In addition, there is an interstitial ion M + which acted as a charge compensator before the irradiation. Cente…
Abstract The reducibility of La1-xSrxCoO3 (a perovskite-type mixed oxide) remarkably increased with the Sr2+ content, x, but the rate of re-oxidation of the reduced catalysts decreased with x. These trends well explain the catalytic activity for oxidation on the basis of redox mechanism.
Abstract Recent opinions on the effect of nonmetallic inclusions, especially sulfides, on the nucleation of pits, stress corrosion cracks, and hydrogen‐induced cracks are reviewed. The nonmetallic inclusions present in steels as impurities adversely affect the corrosion resistance of steels. This is true for both the…
The EPR spectra of the title compound revealed an unusual linewidth anisotropy. The anisotropy showed behavior characteristic of relaxation effects due both to exchange anisotropy and to spin diffusion. This is the first ferromagnetic layer salt of the ${(R\mathrm{N}{\mathrm{H}}_{3})}_{2}(\mathrm{Cu}{\mathrm{Cl}}_{4})…