Properties of Barium Titanate in Connection with Its Crystal Structure
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Differential Thermal Analysis
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential Thermal AnalysisM. J. VoldCite this: Anal. Chem. 1949, 21, 6, 683–688Publication Date (Print):June 13, 1949Publication History Published online1 May 2002Published inissue 13 June 1949https://pubs.acs.org/doi/10.1021/ac60030a011https://doi.org/10.1021/ac60030a011…
Charge distribution and energy levels of trapped electrons in ionic solids
Abstract The charge distribution and energy levels of electrons trapped at two types of lattice defect in ionic solids (interstitial ions and F-centres) are calculated using a variation method which takes account of the fact that the field acting on the electron near such a defect depends upon the wave function of the…
Crystal growth from solution
Abstract Single crystals of the cubic form of sodium chlorate are studied in growth from aqueous solution. An interferometric technique measures, via refractive index, concentrations and gradients of concentration contiguous to the crystal. The rates of advance of individual faces are measured and compared with predic…
The crystal structure of atacamite and the crystal chemistry of cupric compounds
The co-ordinates assigned in an earlier study of the crystal structure of atacamite, Cu2Cl(OH)3 or CuCl2.3Cu(OH)2, have been revised. Each Cu atom is shown to have four nearest OH neighbours (mean Cu—OH distance 2.01 A.), and in addition two more neighbours completing distorted octahedral co-ordination groups. For one…
Relation between residual strain energy and elastic moduli
It is shown that the presence of residual strain energy necessarily results in a lowering of the overall tensile and shear moduli, and a quantitative relation is derived between the density of residual strain energy and the decrease in tensile and shear moduli. An interpretation is thereby given to the recent observat…
Transport and Equilibrium Phenomena in Gas-Elastomer Systems. II. Equilibrium Phenomena
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation R. M. Barrer, G. Skirrow; Transport and Equilibrium Phenomena in Gas-Elastomer Systems. II. Equilibrium Phe…
A system for the Sizing of Women's Garments
Body measurements for a representative number of American women (over 10,000) have been analyzed and a system is proposed for the sizing of women's garments based on this analysis. Size classes for the entire population of women 18 years of age and over have been developed in terms of independent control dimensions wh…
Dynamic Studies of Carpet Resilience
The problem of measuring the dynamic properties of a carpet is carried through several different steps which lead to the development of dynamic load measuring equipment designed to evaluate differences of carpet construction.
Studies on the purification of collagen
Several methods of purifying collagen were studied . The effects of particular treatments on collagen were followed by nitrogen determina tions, by electrometric t itra tion analyses, and by electrophor etic measurements.
A plastic theory of design for ordinary reinforced and prestressed concrete including moment re-distribution in continuous members
Summary: A general expression is derived for the ultimate strength in bending of ordinary reinforced concrete and two types of prestressed concrete beams, taking into account plasticity. A method of calculating elasto-plastic deformations is developed and applied to the problem of re-distributing bending moments in co…
The Reaction of Aromatic Aldehydes with Aluminum Chloride and Benzene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Reaction of Aromatic Aldehydes with Aluminum Chloride and BenzeneHerbert E. Ungnade and Elbert W. CrandallCite this: J. Am. Chem. Soc. 1949, 71, 6, 2209–2210Publication Date (Print):June 1, 1949Publication History Published online1 May 2002Published inissue 1 June 1949ht…
Oxidation of D-Galactose and Cellulose with Nitric Acid, Nitrous Acid and Nitrogen Oxides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of D-Galactose and Cellulose with Nitric Acid, Nitrous Acid and Nitrogen OxidesW. W. Pigman, B. L. Browning, W. H. McPherson, C. R. Calkins, and R. L. LeafCite this: J. Am. Chem. Soc. 1949, 71, 6, 2200–2204Publication Date (Print):June 1, 1949Publication History Pu…
DECOMPOSITION AND RESYNTHESIS OF THE MICAS*
A bstract A study was made of the ‐decomposition of the micas muscovite, phlogopite, biotite, and lepidolite and of the vermiculite Jefferisite. Decomposition was effected by heat, water vapor under pressure, and electrodialysis. The changes were generally detected by X‐ray methods supplemented by water‐loss determina…
The Optical Constants of Germanium in the Infra-Red and Visible
Thin films of germanium have been evaporated on glass, quartz, and calcium fluoride slides. The thickness of these films ranged from 4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ to 1\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ cm. Transmission of infra-red light through the films exhibited…
Equation of State for Polystyrene
Practical considerations emphasize the desirability of formulating an adequate equation of state for polystyrene. A fairly satisfactory one is this simplified version of van der Waals' equation, (P+π)(V−ω)=nRT,where π is the internal pressure (or cohesive energy density) and ω is the volume at absolute zero, by extrap…
Dilatometric Studies of High Polymers. I. Second-Order Transition Temperature
By means of a density balance, the relationship between intrinsic viscosity and dilatometric properties is established for polyethylene terephthalate. The most pronounced property change associated with increasing intrinsic viscosity was observed to be the second-order transition temperature. The relationship between…
Time and Stress Effects in the Behavior of Rubber at Low Temperature
The stiffening of rubber-like materials at low temperature involves several different phenomena, sometimes with their effects superimposed. One of these is crystallization. This is a rate process which is generally very fast at high stresses and very slow at zero stress. In these experiments at temperatures near −25°C…
ATTACK OF GLASSES BY ALKALINE SOLUTIONS*
A bstract A comparison is made between the attack by NaOH and that by sodium silicate solutions on a borosilicate glass, a lime glass, and a lead glass. Below roughly 0.5 Na 2 O normality the rate of attack by NaOH is greater, but at higher normalities this is more than doubled in some instances by that of silicate so…
Change in crystallinity upon heterogeneous acid hydrolysis of cellulose fibers
Abstract The recently developed x‐ray method of crystallinity determination is applied to products of heterogeneous acid hydrolysis of cellulose fibers. Upon treatment of viscose rayon fibers with boiling 2.5 N sulfuric acid, the crystalline fraction is increased from 39 to 49% within half an hour, and remains constan…