Materials Literature
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Glass compositions are correlated with published data for refractive index, specific volume, and fluidity, which indicate the presence of different structural types in silicate glasses. These structural types are shown to be uniquely related to the composition areas of primary crystallization phase fields. It is sugge…
Summary The compositions of more than eighty synthetic members of the apatite group with the general formula A 10 ( X O 4 ) 6 Z 2 have been used as a basis for classifying the apatites into three groups. The ratios of the mean sizes of the ‘ A ’ ions to those of the ‘ X ’ ions for all these compositions lie between th…
The electron spin resonance of Gd 3+ has been studied in the orthorhombic and rhombohedral phases of BaTiO 3 . The main features of Gd 3+ resonances are summarized in their relation to Fe 3+ resonances as follows: (1) The axis of the axial crystalline field in the orthorhombic phase is parallel to the <110> polar axis…
Abstract The preparation and properties of films and fibers of highly disordered cellulose are described; the basis of the preparation is the regeneration of cellulose from cellulose derivatives in non‐aqueous media. These cellulose are at least 97% hydrogen‐bond disordered (as measured by the infrared‐deuteration tec…
Abstract Measurements have been conducted on radiation‐crosslinked polytetrahydrofuran (PTHF) of stress‐strain and of swelling coefficients in simple esters. For the linear polymer, measurements have been made of density and intrinsic viscosities in the esters. [η] was also determined under the θ conditions of 33.5°C.…
In E. marginata 12 nonarticulated laticifer initials arise in the cotyledonary node of the young embryo during the early heart stage. The initials arise progressively in the developing embryo, the first laticifers differentiating simultaneously with or shortly before the elements of the pro‐cambium. The laticifers occ…
The nuclear quadrupole resonance frequencies of the halogen atoms in the trihalide ions 13 and Ibr2 in some of their crystalline salts have been measured. The results have been correlated with a simple LOAD-MO bonding description and the charge distributions in the ions have been calculated. These ions can be regarded…
Abstract The stress‐system curves have been measured for isotropic and oriented specimens of poly(ethylene terephthalate) in extension, shear, and compression. It was found that for all these types of deformations there was an intrinsic yield drop, i.e., a fall in true stress. It is concluded therefore that the stress…
A durable-flame retardant based on tetrakis (hydroxymethyl ) phosphonium hydroxide (THPOH), urea, and trimethylolmelamine has been developed and applied to cotton fabric. The process is accomplished by padding fabric through a water solution of the three components to a wet pickup of about 75%, drying at moderate temp…
The maximum usable thickness of specimens, below which dislocation images were observable by transmission, was studied experimentally in the region 50–500 kV in the previous work [Japan J. appl. Phys. 6 (1967), 557]. The present work is a continuation of the previous one. The maximum usable thickness was determined by…
Skeletonema tropicum is distinguished from S. Costatum in possessing a greater number of chromatophores than the latter. S. tropicum is to be found north of the equator as far as latitude 30° in the western Atlantic Ocean, whereas the ubiquitous S. costatum extends into the cold waters farther north. The reason for th…
SUMMARY On the crystallinity of illite in diagenesis and anchimetamorphism A simple method to estimate the degree of “crystallinity” of illite has been used for several years in three French laboratories. Many results, which are unpublished, were obtained; three examples are presented in this paper. They show the sens…
The conductivities of 1.2, 7.9 and 12.6 ppm (weight ratio) Li-substituted NiO are measured at high frequencies up to 24 GHz in the temperature range 110° to 450°K. The conductivity at high frequencies can be expressed as the sum of a temperature-dependent conductivity σ 1 and a temperature-independent additive conduct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTREMOVING INCLUSIONS FROM CRYSTALS BY GRADIENT TECHNIQUESWilliam R. WilcoxCite this: Ind. Eng. Chem. 1968, 60, 3, 12–23Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 March 1968https://pubs.acs.org/doi/10.1021/ie50699a00…
Summary Electron‐microscope studies of the clay fractions of red soils have shown that free iron oxides are present as small (50–100 A diam) discrete particles frequently clustered to form larger irregular aggregates. Although no evidence of iron‐oxide coatings on clay minerals was found, an association of some of the…
Abstract Most lipids do not pass, on heating, directly from a crystalline structure to an isotropic structure. They are often characterized by a number of intermediate phases, ranging from the plastic crystal, where the center of gravity of the molecule may rotate about one or more axes while the three‐dimensional ord…
When a small amount of Ba or Sr is substituted for Pb in Pb(Mg 1/3 Nb 2/3 )O 3 ‐PbTiO 3 ‐Pb2rO 3 , the morphotropic boundary and the compositions which show the highest planar coupling coefficient and dielectric constant shift slightly toward the decreasing PbTiO 3 content. The tetragonality of Pb(Mg 1/3 Nb 2/3 )O 3 ‐…
Octahedral ferrous chelates based on the hydrotris (1-pyrazolyl) borate ligand can be prepared which are fully high spin, or are fully low spin, or have an intermediate magnetic moment which is strongly temperature dependent. Mössbauer and magnetic susceptibility data characterizing this behavior in the solid state ar…
These experiments were designed to determine the degree and kind of variability in the structure of the community that one might expect under very similar ecological conditions. The results of these experiments show that 95.5% to 98.0% of the specimens composed the same species in the eight communities. About 5% of th…
Abstract The dynamic mechanical properties of a polyimide (poly‐4,4′‐oxydiphenylene pyromellitimide) were studied from about 4 to 800°K. at audio frequencies. A prominent relaxation associated with absorbed water content occurs near 230°K. Below 270°K., the modulus undergoes a corresponding increase in value with incr…