Materials Literature
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The response of a lead zirconate titanate ceramic to statically applied uniaxial stresses in the range 0–0.4 GPa has been investigated. The material studied was a niobium-doped composition with the chemical formula Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3. Properties measured as a function of stress include electrical charge…
Abstract A quantitative procedure has been developed for characterizing the complete microstructure of polymers of 1,3‐pentadiene, including the tacticity of any crystalline component. This can be accomplished by a combination of infrared spectroscopy, X‐ray crystallinity, and 300‐MHz NMR spectroscopy. A series of hig…
Summary Whiteite, Ca(Fe,Mn) 2+ Mg 2 Al 2 (OH) 2 (H 2 O) 8 [PO 4 ] 4 , a 14·90(4) Å, b 6·98(2) Å, c 10·13(2) Å, β 113° 07(10)′, Z = 2, space group P 2/ a , α 1·580(5), β 1·585(5), γ 1·590(5), 2V 40–50°, specific gravity 2·58, is a new species from the Ilha de Taquaral, Minas Gerais, Brazil. It is the Al 3+ -analogue of…
Abstract Small‐angle x‐ray scattering (SAXS) and wide‐angle x‐ray scattering (WAXS) as well as small‐angle light‐scattering (SALS) techniques have been applied to investigate the microstructure of a number of commercial poly(vinyl chloride) (PVC) samples. From the wide‐angle x‐ray scattering, crystallinity and crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelative Reactivities in Oxidations of Polypropylene and Polypropylene ModelsFrank R. MayoCite this: Macromolecules 1978, 11, 5, 942–946Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://pubs.acs.…
The defect populations in various MnAl permanent magnet materials have been studied by transmission electron microscopy. It is suggested by the observations that the good hard magnetic properties in the extruded materials are connected with the low density of antiphase boundaries and the relatively high density of def…
The value of the Weibull, logarithmic-logistic, and logarithmic-normal plots in expressing dissolution rate data is considered for the combinations of zero and first-order release with sink and non-sink conditions, and for actual dissolution rate data of diazepam from tablets in a medium of pH2.
Abstract Regression analyses were used to correlate organic matter, texture and surface area values to the cation‐exchange capacity (CEC) of clay‐rich soils in the lowlands of Quebec. The Ap, Bg and Cg horizons of 11 Gleysolic soils (Aqu‐Suborders) were analyzed for CEC, exchangeable bases and acidity, total and fine…
A mathematical model is developed to describe the processes by which transient appearance of salt films occurs during initial stages of corrosion of oxide‐free metal surfaces. The model describes transport‐controlled processes which lead to supersaturation by anodic dissolution, to precipitation of a salt film, and ev…
A generalized form of mean field theory and procedures for applying it to analyze experimental data on the temperature dependence of the saturation magnetization or the effective gyromagnetic factor of n-component amorphous transition-metal–rare-earth alloys are outlined. This analysis yields the spin values of each c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer-effect study of the thermally induced spin transition in tris(2-picolylamine)iron(II) chloride. Dilution effect in mixed crystals of [FexZn1-x(2-pic)3]Cl2.C2H5OH (x = 0.15, 0.029, 0.0009)P. Guetlich, R. Link, and H. G. SteinhaeuserCite this: Inorg. Chem. 1978, 17,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese(II) and chromium(II) porphyrin complexes: synthesis and characterizationChristopher A. Reed, Jay K. Kouba, Carol J. Grimes, and Stephen K. CheungCite this: Inorg. Chem. 1978, 17, 9, 2666–2670Publication Date (Print):September 1, 1978Publication History Published on…
Electrical conductivity was investigated in polycrystalline lead zirconate‐titanate ceramics, with and without various dopants and stoichiometry, fabricated from chemical solutions and mixed‐oxide powders. A multiphase packing‐powder technique was used to control the stoichiometry of the system during sintering. The d…
R.N. Dzinoridze studied the diatoms, silicoflagellates, and ebridians at Sites 336, 337, 338, 339, 340, 343, and 348 (Plate 20). The diatom units of the Pleistocene, namely the Thalassiosira zabelinae unit, Denticula seminae-D. kamtschatica unit, Denticula hustedtii Zone, Denticula hustedtii-D. lauta Zone, and Denticu…
Abstract Numerous polyesters were prepared from 1,2‐ethanediol, 1,3‐propanediol, 1,4‐butanediol, 1,6‐hexanediol, 1,12‐dodecanediol, 1,4‐phenylenedimethanol, and hydroquinone on the one hand and succinyl chloride, glutaroyl chloride, adipoyl chloride, suberoyl chloride, sebacoyl chloride, isophthaloyl chloride, and tet…
The inhibition of corrosion of iron (0.13%C) in hydrochloric acid by thiourea and its derivatives has been investigated. Inhibition is due to adsorption of the molecular species. The maximum of efficiency with low concentrations of thiourea and its N‐substituted derivatives is attributed to the protonation of the inhi…
The simulation of complex fabric deformations, in which the textile fabric is treated as a continuous sheet, requires a suitable formulation of the mechanical behavior of the fabric. The problem is considered within the basic framework of the engineering theory of shells and plates, including some features not previou…
Impurity phases in commercial hot‐pressed Si 3 N 4 were investigated using transmission electron microscopy. In addition to the dominant, β‐Si 3 N 4 phase, small amounts of Si 2 N 2 O, SiC, and WC were found. Significantly, a continuous grain‐boundary phase was observed in the ∼ 25 high‐angle boundaries examined. This…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectra and vibrational modes of iron(III) tetraphenylporphine .mu.-oxo dimer. Evidence for phenyl interaction and lack of dimer splittingJ. M. Burke, J. R. Kincaid, and T. G. SpiroCite this: J. Am. Chem. Soc. 1978, 100, 19, 6077–6083Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of Three-Dimensional Elastic Constants of Polymer Crystals. 2. Application to Orthorhombic Polyethylene and Poly(vinyl alcohol)Kohji Tashiro, Masamichi Kobayashi, and Hiroyuki TadokoroCite this: Macromolecules 1978, 11, 5, 914–918Publication Date (Print):Septembe…