Materials Literature
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Summary The application of classical nucleation theory to the initiation of crystal growth in glasses is discussed. Its application to experimental results obtained for the rate of nucleation in three types of glass, one showing nucleation separately from crystal growth, another showing simultaneous nucleation and gro…
The structure proposed for lead sesquioxide by Byström (1947) is incorrect. The space group found in the present work is P21/a with four Pb2O3 in the unit cell; the unit-cell dimensions are: a = 7.814, b = 5.625, c = 8.466 Å (all ± 0.003 Å); β = 124°48′ ± 5′. The structure has been determined by means of X-ray and neu…
Barium ferrite (Ba.0.6Fe2O3) platelets of approximately\frac{1}{2}\mum diameter and with intrinsic coercive force of about 5000 Oe were crystallized from a glass phase. To study the nature of the defects and their influence on the magnetic properties, the crystailized glass was plastically deformed by applying a press…
Abstract The processes of energy dissipation in polymeric foams are discussed. Theoretical considerations and experimental results show that impact behavior of foams with a rate independent modulus can accurately be predicted by Instron data.
The phenomenon, solid cadmium embrittlement, was identified and studied in the titanium alloys Ti-6Al-4V and Ti-8Al-1Mo-1V using cadmium coated tensile specimens and residual stress specimens. The conditions necessary for this phenomenon were found to be tensile stress and intimate contact between the cadmium and tita…
During measurement of preferred crystallographic orientation with the Schulz x-ray diffraction technique, several factors can cause defocusing. Earlier investigations showed that tilt of the specimen in Φ, the angle between the normal to the sample surface and the normal to the diffracting plane, is the most severe li…
We present a reproducible method of synthesizing tetrabasic lead sulfate (4PbO · PbSO4) which produces discrete elongated crystals approximately 22 microns long. Tetrabasic lead sulfate undergoes anodic conversion to PbO2while maintaining the characteristic morphology of the 4PbO · PbSO4crystals. This results in lead-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrutural Studies of Polyethers [-(CH2)mO-]n. VIII. Polyoxacyclobutane Hydrate (Modification I)Hideto Kakida, Daisuke Makino, Yozo Chatani, Masamichi Kobayashi, and Hiroyuki TadokoroCite this: Macromolecules 1970, 3, 5, 569–578Publication Date (Print):September 1, 1970Public…
Abstract Gelation of poly(ethylene terephthalate) by heating at 263°–300°C was investigated. Under nitrogen flow, crosslinks were scarcely formed. However in air, degradation and crosslinking were common, and these were accelerated by purging gaseous and sublimable degradation products out of the system with a stream…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance of trans-disubstituted bis(ethylenediamine)chromium(III) complexes in frozen solutionsJ. C. Hempel, Leon O. Morgan, and Warren Burton LewisCite this: Inorg. Chem. 1970, 9, 9, 2064–2072Publication Date (Print):September 1, 1970Publication Histo…
Benzotriazole is a specific corrosion inhibitor for copper and copper alloys. It is now widely used in industry to reduce the corrosion of these alloys under both atmospheric and immersed conditions. Corrosion of copper may produce a surface stain or tarnish, pitting of surfaces of pipes or promote pitting of other me…
Eigenphases near a resonance are shown to follow an equation which is a simple generalization of the usual equation for the behavior of the phase shift near a resonance in single-channel scattering. The parameters in the equation are shown to have a simple graphical interpretation.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of Oligomeric Poly(isoprenyllithium)F. Schué, D. J. Worsfold, and S. BywaterCite this: Macromolecules 1970, 3, 5, 509–513Publication Date (Print):September 1, 1970Publication History Published online1 May 2002Published inissue 1 September 1970https://doi.org/10…
My life has been an interesting voyage. I became an astronomer because I could not imagine living on Earth and not trying to understand how the Universe works. My scientific career has revolved around observing the motions of stars within galaxies and the ...Read More
Quartz crystals obtained from three different sources have been strained in air a t atmospheric pressure, using compression rates of 10−3 to 10−5 sec−1. Of the three kinds of quartz tested, only the synthetic sample containing the highest amount of hydrogen-bonded OH groups (163 p.p.m.) was found to yield plastically,…
With a view to elucidating the structure of liquid ZnCl2 and deciding the extent of the analogy to SiO2 and BeF2 (liquid and vitreous) provided by ZnCl2 (liquid and vitreous), a variety of measurements on ZnCl2 have been performed. Density and expansivity measurements and probe ion electronic spectra are used to demon…
Based on the elastic interaction between a solute atom and a tensile crack-tip stress field, a mechanism of stress-corrosion cracking was proposed and analyzed. This elastic interaction provides a potential for solute atoms to migrate toward the tip of a crack. The elastic interaction and the equilibrium concentration…
Samples of polycrystalline (La 1- x Ca x )MnO 3 , where x takes the values ranging from 0.005 to 0.3, were studied experimentally. Stoichiometric specimens were made by carefully controlling the oxygen partial pressure. For specimens with x less than 0.1, the Néel temperature T N is almost constant at 141°K, while the…
From chemical analyses performed on an Arago profile, it met the requirements of the Podzol order, except for exchange properties. The cation exchange capacity was low and the ΔCEC never reached the limit of 8 meq/100 g. Qualitative and quantitative mineralogical analyses showed that illite was the predominant compone…
Oriented Si steel containing up to 6 percent Si was produced by gaseous siliconizing of oriented 3.25-percent Si steel strip. Dc magnetization curves in the with-grain (rolling) direction and ac core loss and magnetostriction measurements in both the with- and cross-grain (transverse) directions were obtained before a…