Materials Literature
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The magnetostriction of oriented polycrystalline MnBi was found to be higher than any published value for a metal. A value of −250×10−6 was measured parallel to a field of 22 000 oersteds oriented perpendicular to the c axis of the aligned hexagonal crystallites. This field magnetized the specimen to only slightly mor…
The dependence of saturation induction at room temperature upon composition for the substitution of nonmagnetic ions into BaFe12O19, into BaM2Fe16O27 (where M2=Ni2, Ni1.5Cu0.5, Zn2), and into the mixture BaNiFe14O23 is given. Evidence is presented for the existence of points of magnetic compensation in a number of ser…
It is often necessary to obtain expansions in spherical harmonics that belong to a given irreducible representation of a symmetry group. This is the case, for instance, when the cellular method is applied to investigate the band structure of a metal, where expansions are required that reproduce the symmetry of the gro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacities and Thermodynamic Properties of Crystalline and Vitreous Anhydrous Sodium Tetraborate from 6 to 350 °K.Edgar F. Westrum Jr. and George GrenierCite this: J. Am. Chem. Soc. 1957, 79, 8, 1799–1802Publication Date (Print):April 1, 1957Publication History Publ…
The interrelationship of corrosion rate of steel, dissolved oxygen concentration, agitation, electrode potential, and cathodic protection current density were studied under controlled laboratory conditions. While the corrosion rate of steel is essentially linear with amount of dissolved oxygen, the rate appears to fal…
The tearing failure of materials depends very strongly on the conditions of use or testing which produce the non-uniform tensile stress which causes such failure. In the trapezoid tear test. the stress pattern is determined largely by variables at the disposition of the operator. The effect of these variables on the t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiviral Compounds. II. Aromatic GlyoxalsRobert Bruce Moffett, Burris D. Tiffany, Brooke D. Aspergren, and Richard V. HeinzelmanCite this: J. Am. Chem. Soc. 1957, 79, 7, 1687–1690Publication Date (Print):April 1, 1957Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of Phosphates, Rates of Solution of Calcium Phosphates in Phosphoric Acid SolutionsE. O. Huffman, W. E. Cate, M. E. Deming, and K. L. ElmoreCite this: J. Agric. Food Chem. 1957, 5, 4, 266–275Publication Date (Print):April 1, 1957Publication History Published onlin…
Abstract A theory for the tensile strength of rubbers is presented. It gives reasonable agreement with the available experimental data for natural and synthetic rubber. One of the basic postulates of the theory is that, in order for the sample to break, conditions must be such that when one chain breaks the extra load…
Abstract Durch Umsetzen von Cr 2 O 3 mit Silberpulver im Sauerstoffstrom bei 650° C wurde die Verbindung AgCrO 2 , durch Umsetzen entsprechender binärer Chalkogenide in evakuierten Quarzbömbchen bei höheren Temperaturen wurden die Verbindungen CuCrS 2 , AgCrS 2 , CuCrSe 2 und AgCrSe 2 hergestellt und röntgenographisch…
Data are presented for the solubility of hydrogen and deuterium in eight nonpolar solvents from —25°C to 35°C, and show that deuterium is about 2.5% more soluble. The data are accurate to 0.1% and correlate successfully with the solubility parameter of the solvent. The various thermodynamic functions are calculated.
Abstract 1. The hydrogen bonding effect on the fluorescence of quinoline and acridine was studied in non-polar solvent mixed with various proton donors. 2. The equilibrium constants of hydrogen bonding calculated from the absorption and fluorescence data were the same for these molecules, in contradistinction to the c…
Intensities of X-ray diffraction from α-AgI at various temperatures were measured in the absolute scale by using a G–M counter spectrometer with the crystal monochromated Cu Kα radiation. Measurements of the specific heat and the thermal expansion were also performed. A drastic temperature dependence of the intensitie…
Short-time tensile tests were m ade at temperatures ranging from 75 0 to 1,700 0 F on high-purity nickel, copper, a 70-percent-nickel-30-percent-copper alloy, and a 70-percenteopper-3 0-percent-nickel alloy. The high-purity component metals and the two alloys were investigated in the initial conditions, as annealed fo…
Previous investigators have indicated that both small particles and the addition of certain oxides promote the sintering of alumina at temperatures below 1700°C. By utilizing combinations of oxides and small particle size, the sintering temperature of 96% alumina bodies was reduced in this investigation to the 1300° t…
It is shown that, provided the effective atomic number remains constant, there is a general relationship between the variation of scatter with density and the variation with geometry of the system. A simplified analysis of the scatter contribution in water equivalent bodies is presented. This analysis leads to the def…
The rates of thermal decomposition of hydrogen peroxide vapor were measured by the static method at low pressures (0.2 to 20 mm. Hg), over the temperature range 300°–600 °C., in carefully cleaned glass vessels. The reaction was of the first order with respect to time and the final products were only water and oxygen.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral Basic Catalysis of Ester Hydrolysis and Its Relationship to Enzymatic Hydrolysis1Myron L. Bender and Byron W. TurnquestCite this: J. Am. Chem. Soc. 1957, 79, 7, 1656–1662Publication Date (Print):April 1, 1957Publication History Published online1 May 2002Published ini…
Abstract Specific heat measurements have been carried out on granular and annealed Marlex 50, a polyethylene polymerized at relatively low pressures, over the temperature range −25 to 150°C. Calculation of the crystallinity yields maximum values of 82.6 and 93.8% for the granular and annealed Marlex 50, respectively.…
TH• Spotted and Brown towhaas (Pipilo erytkropkthalmus and P. fusees) are common and widespread species in western North America.Both are mainly terrestrial, have similar body proportions, and are at present considered congeneric.In spite of their ready availability as objects for study, their foraging behavior has on…