Materials Literature
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The barium ferrates comprise a series of compositions exhibiting a wide range of oxygen deficiency. Members of this series are isostructural with the high-temperature polymorph of barium titanate which is hexagonal with space group C63/mmc. Polycrystalline specimens with varying oxygen contents, i.e., Fe4+ concentrati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent Effects on the Spin Resonance Spectra of Cobalt PhthalocyanineJacques M. AssourCite this: J. Am. Chem. Soc. 1965, 87, 21, 4701–4706Publication Date (Print):November 1, 1965Publication History Published online1 May 2002Published inissue 1 November 1965https://pubs.acs…
Detailed examination of recent strength‐grain size data for MgO, Al 2 O 3 , and BeO ceramics showed that for large grain sizes behavior was of the form of the Knudsen equation: image . For small grain sizes, behavior fitted the form of the Petch equation, image or appeared similar but with negative slope. Three charac…
In order to provide a basis for calibration of X-ray-emission analyses, existing theories and experimental measurements on the generation, absorption, and fluorescence of X-rays produced by electron bombardment of mixed targets are reviewed and compared with new measurements for a variety of targets, principally commo…
Cast amorphous one mil films of poly(ethylene terephthalate)were allowed to crystallize isothermally in silicone oil over the temperature range 25–240°C. The crystallization paths were followed by recording the percent of transmission of 4000 A. light through the films as a function of time at specific temperatures. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncorporation of cis- and trans-4-Fluoro-L-prolines into Proteins and Hydroxylation of the trans Isomer During Collagen Biosynthesis*A. Arthur Gottlieb, Yoshimasa Fujita, Sidney Udenfriend, and Bernhard WitkopCite this: Biochemistry 1965, 4, 11, 2507–2513Publication Date (Pr…
SUMMARY Progressive alteration of the incubation temperature of Aerobacter aerogenes cultures, growing in a chemostat at a fixed dilution rate, caused a progressive change in bacterial concentration and in bacterial RNA, carbohydrate and protein contents; the DNA content did not vary significantly. The change in bacte…
A useful and significant relationship exists between the Debye temperature θD and the monovacancy formation energy E f. It appears that E f for close-packed metals can be calculated from θD with an uncertainty of not more than 5–10%.
The diffusion cross section for electrons in a gas of polar molecules is calculated. The improvement over a previous calculation is the use of the exact scattering cross section of a charged particle by a point dipole rather than the first Born approximation. For ${\mathrm{H}}_{2}$O the correction amounts to about 20%…
Temperature and bias characteristics of ceramics of Pb(Zr-Ti)O 3 and its families have been measured. Bias dependence can be understood with a schematic model on the reorientations of 180° and 90° domains. Dielectric and elastic anisotropies of the single crystal are expected to be larger in the rhombohedral phase tha…
The derivation is outlined of a general relation connecting the macroscopic plastic strain rate with the configuration and velocity distribution of dislocations in a monocrystal with a single active glide system. This can be simplified for particular cases, the most simple being the case of parallel straight dislocati…
Twinned crystals of low cristobalite from Ellora, Hyderabad, India were found to have space group P4121 (or P4321) and cell dimensions a = 4.978 and c = 6.948 A. A three-dimensional full-matrix least-squares refinement based upon 110 integrated intensities which were corrected for the effects of twinning, confirmed NI…
The magnetocaloric effect and magnetization of a polycrystalline ellipsoid of dysprosium were measured in magnetic fields up to 20 kOe from the temperature of liquid nitrogen to room temperature. Dysprosium exhibits both heating and cooling upon adiabatic magnetization depending on its magnetic state (ferromagnetic, p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and Structural Studies of Rhenium(V) Oxyhalide Complexes. I. Complexes from Rhenium(III) BromideF. A. Cotton and S. J. LippardCite this: Inorg. Chem. 1965, 4, 11, 1621–1629Publication Date (Print):November 1, 1965Publication History Published online1 May 2002Publish…
A study has been made of the behaviour of {1012} ⟨011⟩ type deformation twins in fatigued cadmium, zinc, magnesium and titanium. Plastic deformation is accentuated at twin interfaces, which subsequently become serrated : the serrations are accommodated by closely spaced kink boundaries. Pre-existing twins are broken u…
The general arrangement of cytoplasmic organelles in Amphipleura pellucida Kutz. is similar to that in other naviculoid diatoms. The chromatophores are parietal with a single, non‐membrane‐limited, pyrenoid. The pyrenoid is crossed by several double‐disc lamellar bands which are occasionally interrupted by less dense…
The effect of pre-existing micro-cracks on the fracture of [010] tungsten single crysta's has been investigated. Cleavage cracks on (010) planes were introduced into the edge of the specimens by a spark-machining technique. Tensile tests at 77°K showed that the fracture stress was dependent on the crack length accordi…
The reversible dimerization of the anion radical of 7,7,8,8-tetracyanoquinodimethane in aqueous solution has been studied spectroscopically. Analysis of the spectra yields an equilibrium constant for dimerization (2A−⇆A2=) at 25° of 2.5×103 liter/mole and a heat of dimerization of −10.4 kcal/mole dimer.
Quantitative X‐ray diffraction methods were used to define the kinetics of spinel formation. Diffusion controlled reaction rate constants were calculated on the basis of the reaction models of Jander, Dunwald‐Wagner, Valensi, Zhuravlev et al. , Ginstling‐Brounshte'n, and Kroger‐Ziegler. The model proposed by Valensi i…
Composition and protectiveness of the iron sulfide film, formed as a result of the liquid phase H2S-CO2-H2O corrosion of Armco iron, have been related to the initial pH of the solution. Composition of the film was determined by electron diffraction analysis. Protectiveness of the film was determined by measuring the w…