Materials Literature
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There is some ambiguity in the interpretation of internal photoemission experiments because of the possible contribution of hole emission from the anode in addition to the cathode electron emission. Furthermore, correction of the photocurrent spectra for optical intensity variations is essential to determination of ph…
The internal stress distribution theory of magnetomechanical damping is modified and extended to include effects of applied magnetic fields and applied static stresses. The present internal stress distribution function yields Rayleigh behavior at low vibration stress and has a more realistic shape than that of the pre…
By measuring internal crystallization in vitreous silica, the kinetics of crystallization and melting of cristobalite were determined near the melting point. Both processes followed linear growth kinetics and could be completely represented by the equation μ=AΔT/η. Analyses of the crystallization data and observations…
Abstract Polytypism in trioctahedral 1 : 1 phyllosilicates results from two variable features in the structure. (1) The octabedral cations may occupy the same set of three positions throughout or may alternate regularly between two different sets of positions in successive layers. (2) Hydrogen bonding between adjacent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption on hydroxylated silica surfacesMichael L. Hair and William HertlCite this: J. Phys. Chem. 1969, 73, 12, 4269–4276Publication Date (Print):December 1, 1969Publication History Published online1 May 2002Published inissue 1 December 1969https://pubs.acs.org/doi/10.102…
M. W. Thompson London: Cambridge University Press. 1969 Pp. viii + 384. Price £6 Prof. Thompson has written a book in which the ideas and material are presented at two quite distinct levels of scientific sophistication. In the first quarter of the book he discusses the nature of point and extended defects in crystals…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiimide reduction of porphyrinsHoward W. Whitlock Jr., R. Hanauer, M. Y. Oester, and B. K. BowerCite this: J. Am. Chem. Soc. 1969, 91, 26, 7485–7489Publication Date (Print):December 1, 1969Publication History Published online1 May 2002Published inissue 1 December 1969https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic analysis of thermogravimetric dataJohn Henry. Sharp and Sally A. WentworthCite this: Anal. Chem. 1969, 41, 14, 2060–2062Publication Date (Print):December 1, 1969Publication History Published online1 May 2002Published inissue 1 December 1969https://pubs.acs.org/doi/10…
A method for determining the position of dislocation lines accurately from dislocation images is reported and applied to the case of measuring the separation of partial dislocations. A theoretical analysis of the method is given, and the predictions verified by many-beam computed image profiles. The separation of part…
Abstract Die Darstellung einer Reihe von Porphyrin‐Metall‐Komplexen wird beschrieben. Unter Berücksichtigung von bekanntem und neuem Tatsachenmaterial wird eine Deutung der unterschiedlichen Elektronenspektren der Porphyrinkomplexe gegeben. Ausgehend von Salzen ms ‐tetrasubstituierter Porphine, die als Alloporphin‐Der…
We present electron diffraction data from amorphous silicon which cannot be reconciled with the intensity profiles derived from small-crystallite models based on the diamond structure. Our diffraction patterns do reveal a pronounced low-angle scattering which anneals out on progressive heating and is indicative of act…
A new energy parameter ${\mathcal{E}}_{d}$ is introduced to describe dispersion of the electronic dielectric constant. This dispersion energy is found to obey an extraordinarily simple empirical relation in the more than 50 ionic and covalent crystals for which reliable refractive-index dispersion data are available.…
By measuring changes in the dielectric constant of a 1.75:1 cholesteryl chloride–cholesteryl myristate (CM) mixture in the presence of magnetic fields H up to 10 kG, the orientation of the molecular and helical axes with respect to the field direction can be deduced, and the possibility of a dependence of the alignmen…