Band Structure and Optical Properties of Diamond.
Three points in Fig. They are the I point in the conduction band, and the two adjacent points along the
Materials Literature
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Effect of pH on structure and mechanical properties of electrodeposited iron
Abstract Relationships between the mechanical properties of electrodeposited iron and the pH of the bulk of the solution were obtained for a chloride/fluoborate plating bath. Both ultimate tensile strength and percentage elongation at fracture passed through a maximum over a narrow range of pH. Structural studies usin…
Etching of synthetic barite (BaSO 4 ) single crystals
Single crystals of barite grown in this laboratory by a chemically reacted flux method have been cleaved parallel to (001) and (110) planes and the cleavage faces have been studied by multiple beam interferometry. The cleavage faces were etched in HCl and H2SO4 and the etch patterns were compared with those produced o…
Measurements of the thermal conductivity of thin films of magnetite
Measurements have been made of the thermal conductivity of iron oxide layers in the `as-formed' condition for oxide thicknesses in the range 0·027-0·48 mm over the temperature range 50-80°C. A steady-state method, involving the use of a calibrated thermopile for determining the surface temperature of the oxide, has be…
On variance as a measure of line broadening in diffractometry: effect of a distribution of sizes on the apparent crystallite size
If the crystallites making up a diffractometer specimen have a number-average size , and the distribution function of crystallite sizes has a variance Wp and skewness p, the crystallite size obtained from the slope of the variance-range curve will be and that obtained from the intercept will be Even when Wp and p are…
Polymerization of isocyanates. V. Thermal degradation of polyisocyanates
Abstract Thermal degradation of polyisocyanates was investigated. The only degradation products were monomer and trimer. The main product was trimer for most aliphatic polymers, and monomer for aromatic polymers. Poly(cyclohexyl isocyanate) gave only its monomer on account of steric requirements. The apparent activati…
Comparison of the donor properties of dimethylcyanamide and acetonitrile
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the donor properties of dimethylcyanamide and acetonitrileH. Fred Henneike Jr. and Russell S. DragoCite this: Inorg. Chem. 1968, 7, 9, 1908–1915Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 September…
Chlorination of polystyrene
Abstract Chlorination of a low molecular weight polystyrene in the α position was studied by following changes in the infrared spectrum, glass transition temperature, and molecular weights of the polymer. The logarithm of the absorbance ratio at 2920 and 1500 cm −1 as a function of mole per cent chlorination was linea…
Anodic Protection for the Control of Corrosion Fatigue
Potentiostatic anodic polarisation studies have been carried out on two carbon steels and three stainless steels in oxidising media. The resulting curves clearly defined the conditions necessary for anodic protection. Apparatus was devised whereby corrosion fatigue tests could be conducted under conditions of impresse…
Relative reactivities of cyclic ethers in cationic copolymerizations: Effects of ring strain and basicity
Abstract The relative reactivities of α‐monosubstituted cyclic ethers having rings of three to six members toward a cation were estimated from their copolymerizations with 3,3‐bis‐(chloromethyl)oxetane (M 1 ) catalyzed by boron trifluoride etherate in methylene chloride at 0°C. It was found that the reactivity of thes…
Ferromagnetism and ordering in Fe-Co alloys
Results of our experimental investigation on the magnetization, specific heat, and neutron diffraction in Fe-Co alloys are reported and interpreted by a statistical theory in B-W approximation. The exchange interactions between neighboring atoms in bcc are determined so that the theory reproduces the experimental magn…
The variance and other measures of line broadening in powder diffractometry. II. Determination of particle size
The procedure for interpreting broadened diffraction maxima in terms of particle size is illustrated by means of two samples of nickel powder. The average size of the particles in submicron nickel is determined from a comparison of various measures of breadth of broadened profiles with the breadths of `standard' lines…
Mechanism of electrical conductivity in Nickel-Iron Ferrite
Measurements of the frequency dependence of the dielectric conductivity, Hall mobility, and thermal EMF as a function of temperature on polycrystalline Ni0.6Fe0.4Fe2O4indicate that these data can be interpreted in terms of the band model. Previous analyses of the semiconductor properties of ferrites according to the h…
Bacterial Degradation of Plasticized PVC
SUMMARY Sixtytwo bacterial cultures isolated from a range of deteriorated plastic materials were tested for their ability to degrade a particular PVC mix plasticized with di‐ iso ‐octyl sebacate. Twentythree of them, mainly members of the genera Pseudomonas and Brevibacterium , gave weight losses of up to 20% in 2 wee…
The effect of hydrogen on the electrical properties of rutile
Hydrogen in rutile has two influences on the electrical properties: Verneuil crystals contain hydrogen compensating the trivalent impurities. Excess hydrogen acts as an electron donor, thereby increasing the conductivity. Removal of hydrogen above 650°C in vacuum causes structural changes accompanied by enhanced condu…
Molecular conformation of chymotrypsinogen and chymotrypsin by low-angle x-ray diffraction
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular conformation of chymotrypsinogen and chymotrypsin by low-angle x-ray diffractionW. R. Krigbaum and R. W. GodwinCite this: Biochemistry 1968, 7, 9, 3126–3131Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 S…
Electronic Structure of Iron Nitrides Studied by Electron Diffraction. II. ε-Fe2N and ζ-Fe2N
Electronic structure of hexagonal ε -Fe 2 N and orthorhombic ζ-Fe 2 N were determined by the measurement of superstructure reflection intensities, which are contributed only by nitrogen atoms. Specimen films were produced by nitriding evaporated polycrystalline iron films with ammonia gas. From the analysis of observe…
Swelling Degree of Cellulose Materials and Hydrolysis Rate with Cellulase
We investigated some relationships between the hydrolysis rate with cellulase and the swelling degree of the cellulose fibers of different samples. The water retention value (WRV) determined by the centrifugal method was used as a measure of the swelling degree. A linear relationship was observed between the hydrolysi…
The crystal chemistry of the tellurium oxide and tellurium oxosalt minerals
In the two modifications of TeO 2 and in the tellurites two limiting cases for the coordination of oxygen around tellurium are known: on the one hand a 3-coordination in the shape of a trigonal pyramid, and on the other hand a 4-coordination in the shape of a trigonal dipyramid with one of the corners of the equatoria…
Gel–water relationships in hydrophilic polymers: Thermodynamics of sorption of water vapor
Abstract A thermodynamic study was conducted of water vapor adsorption on four hydrophilic polymers (agar, carboxymethyl cellulose, gelatin, and maize starch) at 12 and 25°C. Monolayer coverage amounted, after correction for crystallinity, respectively, to 0.93, 1.46, 0.51, and 0.77 mol water/mol monomer. Evidence is…