Materials Literature
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Abstract The macroscopic C.R.S.S. for prismatic slip in Beryllium is found to increase with increasing temperature in the range −100 to +50 °C while the microyield limit decreases regularly. Slip is initiated on the prism planes from the edge dislocations present in the annealed material. Evidences of a thermally acti…
The vapor-phase germanium oxides GeO, Ge2O2, and Ge3O3 have been isolated in nitrogen and argon matrices. In a nitrogen matrix, infrared absorptions are observed at 973.4 (74Ge16O); 667.0, 599.0 (Ge216O2); 824, and 440 cm−1 (Ge316O3). A fourth species, Ge4O4, is formed on diffusion, and gives infrared absorptions at 5…
For some years now, many workers have been active in the development of a stainless steel that is resistant to pitting and crevice corrosion in halide media. Electrochemical techniques combined with statistical multiple‐regression analysis have beeen used to derive a relationship between pitting susceptibility and che…
Abstract Copper single crystals oriented for single glide were deformed in tension at 78 °K to various resolved shear stresses and were then neutron‐irradiated at 4 to 20 °K before stress‐removal in order to pin the dislocations in the stress‐applied state. A comparison of transmission electron micrographs obtained fr…
We present two methods for calculating the potential profiles of depletion layers in ferroelectric materials. The simplified method is valid for materials possessing a high permittivity and with the electric field parallel to the polarization. The second method is valid for low permittivity materials as well and can b…
N. H. Brett, K. J. D. MacKenzie and J. H. Sharp, Q. Rev. Chem. Soc., 1970, 24, 185 DOI: 10.1039/QR9702400185
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDelayed Fluroescence and Phosphorescence of Aromatic Ketones in SolutionJack. Saltiel, Howell C. Curtis, Lewis. Metts, John W. Miley, John. Winterle, and Mark. WrightonCite this: J. Am. Chem. Soc. 1970, 92, 2, 410–411Publication Date (Print):January 1, 1970Publication Histor…
Some electrochemical properties of polycrystalline tin oxide in the form of thin films have been examined. For a variety of antimony‐doped specimens the carrier concentration has been determined from the space charge capacity and compared with donor concentrations. Disparities between the two values have been found, a…
Les propriétés magnétostatiques des manganites de terres rares, TMnO3, ont été étudiées entre 2 et 1 500 °K environ. Ces composés sont antiferromagnétiques ; les points de Néel sont à des températures inférieures à 100 °K. On discute cet antiferromagnétisme dans un modèle du champ moléculaire ; on détermine l'ordre de…
The equilibrium and dynamic aspects of the dielectric behaviour of polymer systems are considered in macroscopic terms and molecular terms. The role of dipole moment correlations is considered for a model polyether series. It is suggested that studies of certain copolymers reveal that the reorientation term 〈µk(0). µk…
CN has been trapped as a randomly oriented molecule in argon, krypton, and neon matrices at 4°K. The ESR spectra of 12C14N and 13C14N in their ground Σ+2 states have been determined and yield the following magnetic parameters in solid argon: g‖ = 2.0015(5), g⊥ = 2.0003(5), A‖(14N) = + 18.2(4) MHz, A⊥ (14N) = − 28.0(3)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock Copolymers of Polydimethylsiloxane and PolystyreneJohn C. Saam, David J. Gordon, and Sarah LindseyCite this: Macromolecules 1970, 3, 1, 1–4Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs…
Les isothermes d’adsorption de krypton, xénon et méthane sur des surfaces homogènes de graphite exfolié, présentent un nombre de marches plus grand que sur les graphites habituels. On leur applique l’équation de CHAMPION et HALSEY et on vérifie que le potentiel d’adsorption décroît, d'une couche adsorbée à la suivante…
Refinement of crystal structures incorporating an extinction parameter in an approximation developed by Zachariasen has led to the experimental observation that some crystals show anisotropic extinction effects. A formalism is presented for refinement of anisotropic extinction coefficients for both extreme crystal typ…
Hydrogen is an environmentally friendly fuel that is promoted as one of the most promising alternative energies to replace fossil fuels. The production of hydrogen through the hydrolysis reaction of aluminum is a solution to overcome the problems in the current hydrogen production method. The production of hydrogen th…
Cerium doped barium titanate is prepared by conventional ceramic method. The dielectric studies of Ba1-x Cex TiO3 have been accomplished at room temperature over a frequency range 75 KHz to 30 MHz for x = 0.1 to 0.4 with pure BaTiO3. The measurements of the real and imaginary part of dielectric constants show strong f…
Significant increases in tensile strength and slight decreases in ductility occur when titanium and titanium-base alloys are irradiated at 17 K to 1 to 10×1017 fast neutrons per square centimeter. The magnitude of the irradiation effect appears to depend on total alloy content and, over the fluence range investigated,…
A total of 97 phytoplanktonic algal taxa belonging to 17 genera under two classes (Euglenophyceae and Bacillariophyceae) have been recorded from a pond receiving effluents from two textile industries at Demra, Dhaka district. Five diatom species, namely Navicula cryptocephala Kütz., N. decussis Oestrup, N. rhynchoceph…
Abstract Mössbauer spectra of Ga t Fe 3− t O 4 ( t = 0.44) were taken at temperatures from 88 to 740 °K. The A‐ and B‐site Zeeman patterns are resolved. The B‐site pattern displays a variation of hyperfine field arising from a distribution of the non‐magnetic gallium ions in the A‐site. The spectra were analyzed by a…
Occurrence of blue-green algae in plain land, pond side, hilly area and dry rice field soils of Chittagong University Campus and N2 fixation of some of them have been studied. Twenty four species under 20 genera were identified and their number varied from 0.11Ã104/g to 2.8Ã104/g soil. Anabaena oryzae, Calothrix sp.…