Materials Literature
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Lead zirconate titanate is a solid solution with nominal composition Pb(ZrxTi1−x)O3. Ferroelectric thin films of this material have been successfully deposited by a focused ion-beam sputtering technique in an O2 atmosphere. These films were characterized according to composition, crystal structure, and dielectric and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTM3L9(ligand) complexesBirgitte E. R. Schilling and Roald HoffmannCite this: J. Am. Chem. Soc. 1979, 101, 13, 3456–3467Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs.acs.org/doi/10.1021/ja00507a006h…
Anisotropy in mechanical properties, expansion coefficients, and long-term shrinkage of PET films was determined. The films ranged in thickness from 0.92 to 14 mils. Young's modulus, ultimate strength, ultimate elongation, and coefficient of thermal expansion were strongly anisotropic. This anisotropy was related to o…
The elastic and piezoelectric constants of trigonal crystals of selenium and tellurium have been determined. Their values were deduced from measurements of ultrasonic phase velocities at room temperature. The stiffnesses cEαβ in units of 1010 N/m2 and the piezoelectric constants eiα in C/m2 for selenium are found to b…
Synopsis A nomenclature is proposed for the alluaudite and wyllieite complex series which is based on sequentially distributing the cations in the cell according to increasing polyhedral size, matching that size with increasing ionic radii of the cations. For oxidized members, the largest site may be partly occupied t…
Phosphoglycerate phosphomutase of Bacillus subtilis, Bacillus cereus and Bacillus megaterium required Mn2+ as cofactor, whereas the wheat germ and rabbit liver enzymes did not. In the absence of Mn2+, B. subtilis did not sporulate in normal sporulation media but it did sporulate if the proper ratio of glucose or glyce…
The preparation of a large number of novel fluorine-containing aluminosilicate glasses is reported along with the properties of cements formed by their reaction to aqueous solutions of poly- (acrylic acid) (PAA).
The hexagonal cell dimensions a and c of 2H-MoS2 and 2H-WSe2 have been measured over the temperature range 10 to 320 K. In both compounds a increased linearly and c non-linearly with temperature, the linear coefficient of thermal expansion in the c direction being greater than that in the a direction for 2H-MoS2. In 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of tetrakis(cyclohexylamine)di-.mu.-hydroxo-dicopper(II) perchlorate. The first example of a roof-shaped hydroxo-bridged copper(II) dimerM. F. Charlot, S. Jeannin, Y. Jeannin, O. Kahn, J. Lucrece-Abaul, and J. Martin-FrereCite this:…
Summary In order to prepare allophane and imogolite in the laboratory, solutions containing l–2× 10 –3 M orthosilicic acid and 4–0.5 × 10 –3 M A1C1 3 (SiO 2 /Al 2 O 3 molar ratio; 0.5, 1.0, 2.0, 4.0 and 8.0) were heated at 95–100°C for 113 hours after addition of NaOH (NaOH/Al molar ratio; 1.0, 2.0, 2.8 and 3.0). Boeh…
This paper describes the effects of frequency, voltage, temperature and mechanical stress on the times to breakdown of XLPE cable insulation subjected to highly divergent fields. Temperature and mechanical stress reduce the times to breakdown but tests with increasing voltage and high frequency produced unexpected res…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of hydrogen absorption by lanthanum-nickel (LaNi5)W. E. Wallace, R. F. Karlicek, and H. ImamuraCite this: J. Phys. Chem. 1979, 83, 13, 1708–1712Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://d…
The progressive development of the α ‐ Al 2 O 3 scale morphology on an Fe‐27% Cr‐4%Al alloy, and similar alloys containing 0.008%, 0.023%, and 0.82%Y, after oxidation in 1 atm oxygen at 1200°C has been investigated. After oxidation for several hours, the oxide present on the yttrium‐free alloy is convoluted and consis…
Incremental plasticity and fracturing (microcracking) material theory are combined to obtain a nonlinear triaxial constitutive relation that is incrementally linear. The theory combines the plastic stress decrements with the fracturing stress decrements, which reflect microcracking, and accounts for internal friction,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis and release of organoarsenic compounds by marine algaeMeinrat O. Andreae and David KlumppCite this: Environ. Sci. Technol. 1979, 13, 6, 738–741Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https:/…
Abstract Some theoretical properties of a semidilute polymer solution (in a good solvent) near a repulsive wall (no adsorption) are discussed. (i) Near a single wall, the existence of a depletion layer (where the concentration is strongly reduced) with thickness equal to the correlation length ξ( c ) is predicted. Sca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative analysis of XPS intensities for supported catalystsF. P. J. M. Kerkhof and J. A. MoulijnCite this: J. Phys. Chem. 1979, 83, 12, 1612–1619Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs.…
Describe el autor los problemas que se presentan en la conservación de las estructuras da hormigón y metálicas de la fábrica de abonos de Neyveli, y las medidas de protección que le han dado mejor resultado.
La influencia menos discutida del C3A sobre las cualidades del cemento es su efecto sobre el calor de hidratación. Los primeros que relacionan la composición del cemento con el calor de hidratación son Wood Seteineur y Starka en 1932 (17). Sus resultados son probablemente anticuados. Verbeck y Forter (18) y más tarde…
En publicaciones anteriores (1) (2) se dio cuenta de los trabajos efectuados para estudiar el comportamiento de dos cementos portland industriales, en la primera, y la influencia que ejerce la adición de diversas cantidades de una escoria vítrea a un cemento portland ambos de fabricación española, en la segunda, cuand…