Materials Literature
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The seeding for large-area mosaic diamond films approaching single-crystal quality is described. The technique includes patterned etching of relief structures in Si substrates, deposition from a slurry and orientation of macroscopic diamond seed crystals in the structures, and chemical vapor deposition overgrowth of t…
High precision electron probe microanalysis (EPMA) has been used to measure the correlation of oxygen deficiency with carrier concentration in thin films of amorphous indium oxide. This has shown that there are ten times as many oxygen vacancies as would be expected from the carrier concentration measurements, giving…
A new relationship between the relative surface free energy and the surface structure of a cubic material with terrace, step, and kink structures based upon the application of the information theory is presented. Any surface of a face centered cubic crystal exists as combinations of (111), (100), and (110) microfacets…
The combined effect of uniaxial mechanical compression and gradient heating on the pyroelectric properties and domain structure realignment processes in gadolinium molybdate single crystals has been studied. It is shown that the application of mechanical stresses under the condition of gradient heating results in a st…
Abstract A series of thermally stable, tough, linear polyimides containing amide linkages was prepared. The new polyamide‐imides were synthesized by reacting a group of isomers of diaminobenzanilide (DABA) with various dianhydrides, such as 4,4′‐oxydiphthalic anhydride (ODPA), 3,3′,4,4′‐biphenyltetracarboxylic dianhyd…
Crystallization of Li‐Al‐Si‐O‐N oxynitride glasses based on the β‐spodumene composition and the properties of the resultant glass‐ceramics have been studied. The onset of the precipitation of metastable high‐quartz solid solution and its transformation to β‐spodumene shift to higher temperatures with increasing nitrog…
series of samples of the system Co-xnxFe2O4 (x = 0.0, 0.3, 0.4, 0.5 and 0.8) have been prepared by the usual ceramic technique. X-ray analysis shows that they are cubic spinel (single phase). The lattice parameter a and the bulk density D are measured for the samples. The substitution experiments replacing Coe+ by n2+…
The tilt angle behavior of the smectic C phase was studied in several binary systems. The concentration dependence of the tilt angle deviated from the linear relationship. The degree of the deviation was influenced by the difference in the molecular structure between the two components. The tilt angles were found to c…
Abstract The toughening effect of the separate phases of ethylene/propylene block copolymers and their blends was studied by scanning electron microscopy (SEM). The results obtained show that the interfacial adhesion between separate phases and the isotactic polypropene (iPP) matrix in ethylene/propylene block copolym…
A method for retrieving the magnetization curve of a nonlinear coil is described. The parameters of a piecewise-linear or a third-order polynomial approximation can be obtained. A simple bridge RL-multivibrator, which includes an operational amplifier and this coil, is used. The coil parameters are calculated observin…
Abstract Plasticizers have been used for centuries to improve the processability and flexibility of a variety of materials. At the dawn of civilization water was used to plasticize clay for the production of pottery and clay tablets and the Ark was reputedly waterproofed with pitch plasticized with oil. Today the most…
The crystal structure of RbSm(${\mathrm{SO}}_{4}$${)}_{2}$\ensuremath{\cdot}${4\mathrm{H}}_{2}$O was determined at 296 K using the x-ray-crystallographic-diffraction technique. The unit cell is monoclinic with P${2}_{1}$/c space group. The structure can be envisioned as consisting of the following constituents: a nine…
Crevice corrosion behaviors of corrosion-resistant alloys (CRAs) with various Ni, Cr, and Mo contents were investigated in conditions simulating the sour gas environment encountered in oil and gas production. Crevice corrosion occurred more easily in a 0.1 MPa H2S environment than in a 1.0 MPa H2S environment. Ni, Cr,…
Microstructural characteristics of (i) the alloys strengthened by precipitation of a coherent LI2-ordered phase and (ii) the LI2-ordered alloys strengthened by the precipitation of coherent disordered phase are reviewed with particular emphasis on the effects of volume fraction and morphology of second phase. In the N…
A new approach for the removal of copper from solid ferrous scrap is described. With this proposal, solid ferrous scrap intermingled with copper is brought into contact with molten aluminium, which preferentially dissolves copper. After a duration of 5 to 10 minutes at a temperature of 1018 ± 5 K, steel scrap is remov…
Abstract Inclusions occurring in leucites from the Oscar and Zirkel Mesa leucite lamproites consist of high (>10 wt.%) and low (<4 wt.%) K 2 O discrete glass phases which are interpreted to have resulted from silicate liquid immiscibility. Both glasses are quartz-normative and rich in Ti, Fe, Mg, Ca and Ba and p…
Abstract A smectite formed by weathering of mica in a laterite pallid zone at Boddington, Western Australia has been investigated by analytical electron microscopy. The evidence suggests that this mineral has the chemical composition and swelling properties of ideal beidellite but is anomalous in containing abundant n…
Abstract Pb 2 MnO 4 wurde einkristallin dargestellt und die Kristallstruktur mit Röntgenmethoden aufgeklärt (Raumgruppe D –P 4 2 1 c, a = 12,773; c = 5,142 Å; Z = 8). Es bildet einen neuen Strukturtyp, der nicht mit Pb 2 PbO 4 bzw. Pb 2 PtO 4 isotyp ist. Der wesentliche Unterschied beruht auf Zick‐zack‐Ketten kantenve…
Abstract The effect of heat treatments on the total charge and water adsorption by Ca-, Na- and Li-saturated kaolinite was studied using extraction techniques and thermal gravimetric analysis, respectively. Measurements of cation exchange capacity indicated that the total charge of Li-kaolinite was reduced by approxim…
Several methods have been proposed for the measurement of the magnetic losses in electrical steel sheet in a rotating magnetic flux. The method considered here is based on determination of the field quantities and makes use of square specimens and an air gap between the pole faces and the specimen. We earlier reported…