Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the acetylacetonimine adduct of ytterbium acetylacetonate, Yb(C5H7O2)3(CH3COCH = C(NH2)CH3)Mary Frances Richardson, P. W. R. Corfield, Donald E. Sands, and Robert E. SieversCite this: Inorg. Chem. 1970, 9, 7, 1632–1638Publication Date (Prin…
The flexural vibrations of ship-like structures are easily excited by underwater explosions, particularly if the explosion bubble period approximately synchronizes with a period of flexural vibration. A summary of the theoretical analysis shows how the transient motions are related to the principal vibration modes of…
Abstract The electron microscope has been used to study the mechanisms of thermal decomposition of kaolinite in the temperature range 800-1350°C. Three main reaction mechanisms appear to be important in this temperature range. At 850°C metakaolinite breaks down to produce an amorphous defect oxide phase which is homog…
The internal-stress-distribution model of magnetomechanical hysteresis is extended to a calculation of the ΔE effect, the irreversible low-field permeability, and temperature-dependent magnetomechanical damping. The calculation of the strain dependence of the ΔE effect agrees well with experimental results for Fe-7.65…
In the triclinic crystals ammonium and potassium tetroxalate dihydrate 34 and 31 sound velocities respectively were measured by means of the diffraction of light by ultrasonic waves. From these velocities the 21 independent components of the elastic tensor were calculated. Thus, the method first tested by Haussühl & S…
Flashover tests were conducted with the cooperation of the Central Research Institute of Electric Power Industry, the Tokyo Electric Power Company, Inc., and the Chubu Electric Power Company, Inc., at the top of Mount Nyũ gasa, 1850 meters above sea level and the Takeyama Laboratory, nearly at sea level, to obtain com…
It has been shown that the Fe 3+ ions in the distorted perovskite GdFeO 3 become ordered antiferromagnetically at 650 K and the ordering arrangement is G x F z in Bertaut's (1963) notation. The canted moment has been measured at temperatures below 77 K, and has been found to produce an effective field of 310 Oe at the…
The Raman spectra of the noncentrosymmetric biaxial sodium nitrite (NaN${\mathrm{O}}_{2}$) single crystal at 77 and 294 \ifmmode^\circ\else\textdegree\fi{}K are presented. No major difference between the two spectra is observed, indicating that the recently reported phase transition at 178 \ifmmode^\circ\else\textdegr…
Summary Alkaline microgranites and granite, containing aegirine, riebeckite and astrophyllite, from north-west Pakistan, are briefly described, and tentatively correlated with other alkaline rocks in the region.
Abstract The usefulness of various techniques for characterizing poorlyordered inorganic gel systems in clays is considered. Many established instrumental techniques are unsuitable, but thermal methods, chemical dissolution techniques, and specific surface reactions are more appropriate. The reaction of fluoride with…
Abstract A rate constant is generally derived by using Fick's equation corresponding to the spherical interdiffusion of particles. By using this rate constant, chain and primary radical termination rate constants can be approximated to rate constants for the bimolecular reactions between two radical chain ends, and pr…
Abstract Von der Verbindung La 2 Zr 2 O 7 wurden erstmals Einkristalle dargestellt und röntgenographisch untersucht. La 2 Zr 2 O 7 kristallisiert in der Raumgruppe O Fd3m mit der Gitterkonstanten a = 10,786 Å. Der für die Pyrochlorstruktur charakteristische Sauerstoffparameter hat den Wert x = 0,295.
The diffusion of oxygen in UO 2+α was measured between 600° and 1100°C. Samples with initial O/U values 2.08 and 2.04 were reduced in hydrogen; reduction was monitored continuously by electrical conductivity measurements. The relation between total conductivity and average O/U ratio was derived, and the diffusion coef…
Infrared spectra of undeuterated and partially deuterated NaclO 4 •H 2 O, LiClO 4 •3H 2 O, and Ba(ClO 4 ) 2 •3H 2 O were examined. Crystallographic data point to a weak hydrogen bond between water molecules and the perchlorate ions in LiClO•3H 2 O. This is confirmed by the high HDO stretching frequencies for this comp…
Generalized x-ray scattering factors, in a simplified form, have been applied to several organic molecular crystals. Atomic charge parameters for L-shell scattering factors have been determined from x-ray structure factors by the method of least squares. L-shell scattering factors have been computed for products of SC…
Abstract A new quantitative thermal analysis technique was attempted on ABS and Noryl‐type polyblends. A particular component within a polyblend was identified by its glass transition temperature and the amount of the component was determined from the increase in specific heat at the glass transition temperature. Two…
A theoretical analysis was made of the relaxed plain-knitted structure. The analysis differs from previous ones in that no arbitrary geometrical loop shape is assumed and no empirical methods are used. The loop configuration is de rived from consideration of the reaction forces and couples acting within the structure,…
Trademark of Shell Chemical Co. The material is essentially the diglycidyl
RNA synthesis, one of the early events in spore germination, is underway by the 2nd min. During the first 10 min of germination, RNA synthesis can proceed in the absence of exogenous nutrients at the expense of previously existing RNA. Salvage pathways for bases, nucleosides, and nucleotides are operative during this…
Abstract A pyrolysis–gas chromatographic–mass spectrometric technique for analyzing the pyrolysis products from polymers in an inert atmosphere is described. Initial studies encompassing the pyrolysis of poly(vinyl chloride) homopolymer and a series of PVC plastisols (based on o ‐phthalate esters) have provided a comp…