Thermal Expansion of Sputtered Silicon Nitride Films
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Dispersion Relations for Phonons in KCl at 80 and 300°K
Abstract Phonon dispersion relations in KCl at 80°K have been determined using inelastic neutron scattering. The measurements have been performed mainly in the symmetry directions [100], [110], and [111], but also at some other points in the reciprocal space. More than one third of the phonons in all branches were als…
Calotropis‐Glykoside, vermutliche Teilstruktur.. Glykoside und Aglykone, 321. Mitteilung
Abstract Reduction of uscharidin ( 19 ) with NaBH 4 gave a crystalline product C 29 H 42 O 9 which we formulate as β‐tetrahydro‐uscharidin ( 12 ), it was characterised as a crystalline tri‐O‐acetyl‐derivative 14 . The same compound 12 was obtained from calactin ( 18 ) and calotropin ( 18A ), thus confirming earlier re…
Thermal Cycling and Surface Reconstruction in Aluminum Thin Films
The appearance of “annealing hillocks” on heat treated aluminum films has been previously reported. Thin films of Al, deposited on passivated wafers, were annealed for various lengths of time in the temperature range 200°–500°C. The effects of grain size, alloying and surface passivation on hillock formation, were stu…
F Band Absorption in Alkali Halides as a Function of Temperature
Abstract Measurements have been made of the F centre optical absorption function for all twenty alkali halides at seven temperatures between ≈ 5 and 300 °K. The measurements have been fitted with a shape function consisting either of an unsymmetrical Gaussian band or, for the halides of cesium, of three symmetrical Ga…
The Structure of Thin Oxide Films Formed on Nickel Crystals
A study was made of the structural details of thin oxide films formed on the (100), (111), (110), and (311) of nickel. Oxidation temperatures ranged from 400° to 600°C, and the oxide films produced were between 25 and 500Aå thick. An x‐ray technique was utilized to measure the average strain in the films, the mosaic s…
Nuclear magnetic resonance and infrared spectral studies on labile cis-dialkoxy-bis(acetylacetonato)titanium(IV) compounds
The six-co-ordinated titanium(IV) compounds Ti(acac)2X2, where X = MeO, EtO, CF3CH2O, PriO, BunO, ButO, ½[OCH2CMe2CH2O], and Cl, have been studied in solution by infrared spectroscopy and variable-temperature n.m.r. All these compounds adopt the cis-configuration and undergo intramolecular rearrangement, and conventio…
The insignificance of metal–metal bonding in the antiferromagnetism of copper( II ) carboxylate dimers
Magnetic and structural studies on a pair of analogous copper(II) acetate and formate dimers suggest that metal-metal bonding is not important in explaining their antiferromagnetism.
Mechanism of Inhibiting Stress Corrosion Cracking of 18-8 Stainless Steel in MgCl[sub 2] by Acetates and Nitrates
Modest additions of sodium acetate, nitrate, iodide, or benzoate to MgCl 2 test solution boiling at 130°C are found to increase resistance to or inhibit stress corrosion cracking of 18‐8 stainless steel. The critical applied potential in MgCl 2 solution (−0.145v) above which, but not below, cracking occurs is shifted…
A new electric field controlled reflective optical storage effect in mixed liquid crystal systems
A new electric field controlled reflective optical storage effect has been discovered in mixed nematic-cholesteric liquid crystal systems. Ion motion produced by a dc electric field is used to emulsify the initially transparent mixture and give it a milky white appearance. This state remains after the dc signal is rem…
Grüneisen constant and thermal properties of crystalline and glassy polymers
Abstract Polymer crystals are characterized by strong anisotropy of binding forces among units, i.e., the intrachain force constant f is much larger than the interchain force constant g . The anisotropic lattice is reduced to an isotropic one, in which each lattice point represents N * units (segment) along the chain…
Optical absorption in degenerate semiconductors
The optical absorption in doped direct gap semiconductors in which the conduction band may be considered as a degenerate Fermi system is studied near the Burstein edge. The problem is treated within a simple model by the methods of perturbation theory taking into account the final-state interaction between conduction…
Carboxyl Group Modification and the Activity of Lysozyme
Abstract Modification of the carboxyl groups in hen's egg white lysozyme by the carbodiimide-nucleophile procedure developed in this laboratory has shown that all of the carboxyl groups except glutamic 35 can be modified under normal assay conditions. The presence of the substrate protects the aspartic acid residue 52…
Studies in Mössbauer spectroscopy. Part I. Interpretation of quadrupole splitting data for tin( IV ) compounds
Mössbauer spectroscopic data for a range of substituted alkyl- and aryl-tin(IV) compounds are presented. In presumably isostructural series of these and other compounds, the quadrupole splitting increases in the orders: alkyl ∼ aryl ∼ CHCH2 < C6Cl5∼ C≡CPh < C6F5∼ CF3 < SSnR3 < OSnR3, I < Br < Cl < F, and C6H5 < CHCH2…
Moment-Induced Magnetic Scattering and Magnetovolume Effect in Fe65(Ni1-xMnx)35 Alloys
The temperature dependences of electrical resistivity and thermal expansion were measured for face-centered cubic Fe 65 (Ni 1- x Mn x ) 35 ternary alloys. The electrical resistivity of ferromagnetic alloys ( x <0.3) decreases with increasing magnetic ordering. In contrast to this, the resistivity of antiferromagnetic…
Morphology and mechanical behavior of block polymers
Abstract The morphology of solution cast films of butadiene and styrene block polymers in both stretched and unstretched state has been studied by electron microscopy, and has been related to the mechanical behavior of these materials. These micrographs confirm the indications from dynamic properties that this materia…
A Study of the Effect of Deformation on the ESR, Luminescence, and Absorption of MgO Single Crystals
Abstract The effect of plastic deformation on the optical absorption, ESR, and thermoluminescent properties of MgO has been investigated. Plastic deformation produces an optical absorption band at about 217 nm whose intensity is proportional to the percent of deformation. No new ESR signals were detected in the deform…
Scanning electron microscopy
Abstract Scanning electron microscopy is a method of microscopy that permits resolution better than that of the optical microscope (about 100 A) while examining one surface of a bulk specimen. The technique depends on electronic application to microscopy and has been developed over many years by electronic engineers r…
Dissolution Phenomena of Organic Medicinals involving Simultaneous Phase Changes
A model was proposed to analyze the dissolution phenomena involving simultaneous phase changes and its experimental demonstration was done with p-hydroxybenzoic acid and phenobarbital which change to the respective hydrates during dissolution. The mathematical expression for the dissolution according to this model was…
Adsorption de molécules simples sur graphite
Le graphite exfolié par dissociation thermique de son composé d’insertion avec le chlorure ferrique possède une surface d’une homogénéité exceptionnelle.