Materials Literature
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The effects of sintering temperature and cooling rate on the magnetic and crystallographic properties of lithium ferrite were studied. The magnetic moments and lattice parameters increased with increasing sintering temperature; these increases result from correlated oxygen and lithium oxide losses. Either annealing at…
Abstract The relative abilities of various solvents to dissolve crystalline polyvinylidene chloride were judged by comparing temperatures at which dilute suspensions became homogeneous. PVDC is not soluble in common solvents at ambient temperatures. It dissolves in solvents of matching solubility parameter only above…
The transfer of energy from $\mathrm{Yb}^{2}F_{\frac{5}{2}}$ to $\mathrm{Tb}^{5}D_{4}$ by the cooperative action of two ${\mathrm{Yb}}^{3+}$ ions has been observed in Y${\mathrm{F}}_{3}$. The correlation between the $\mathrm{Tb}^{5}D_{4}$ intensity and the $\mathrm{Yb}^{2}F_{\frac{5}{2}}$ and $\mathrm{Tb}^{5}D_{4}$ li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of surface reactions of nitric oxide by nitrogen-15 isotope labeling. I. Reaction between nitric oxide and ammonia over supported platinum at 200-250.deg.Klaus Otto, Mordecai Shelef, and J. T. KummerCite this: J. Phys. Chem. 1970, 74, 13, 2690–2698Publication Date (P…
A new type of spin ordering in a spin-pair system is theoretically investigated. In the system, the intra-pair exchange interaction is antiferromagnetic and is much stronger than the inter-pair exchange interaction. In an external magnetic field, the excited triplet of the pair splits, and the lowest component of the…
Abstract— The values of the absolute quantum yields of fluorescence and of intersystem crossing have been obtained for porphin and its derivatives by methods based on relative measurements involving flash photolysis. For a given compound the sum of these quantum yields is unity within experimental error which shows th…
After digestion of the murein-lipoprotein complex (rigid layer) of the E. coli cell wall with lysozyme the solubilized lipoprotein contained 2 disaccharide units of the murein per 1 lipoprotein molecule. From purely enzymatic degradation of the murein-lipoprotein complex with pronase and lysozyme the peptide GlcNAc-Mu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew fundamental type of inorganic complex: hybrid between heteropoly and conventional coordination complexes. Possibilities for geometrical isomerisms in 11-, 12-, 17-, and 18-heteropoly derivativesLouis C. W. Baker and Jane S. FiggisCite this: J. Am. Chem. Soc. 1970, 92, 12…
Three-terminal dielectric measurements of the weak-field permittivity have been carried out on single crystals of bismuth titanate (Bi4Ti3O12), which contained only ``narrow-angle'' twin walls. The pseudo-orthorhombic εa, εb, εc in these twinned monoclinic crystals show strong dispersion in the frequency range 100 Hz-…
Homoepitaxial growth of GaAs was studied in situ in an ultrahigh-vacuum high-energy electron diffraction (HEED) system. Two surface structures, GaAs(1̄1̄1̄)−(19)1/2 and GaAs(1̄1̄1̄)−2, were observed during growth. The transition from one surface structure to the other was found to be a function of the deposition rate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemiluminescence arising from simultaneous transitions in pairs of singlet oxygen moleculesAhsan U. Khan and Michael KashaCite this: J. Am. Chem. Soc. 1970, 92, 11, 3293–3300Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopyJack M. Hollander and William L. JollyCite this: Acc. Chem. Res. 1970, 3, 6, 193–200Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Published inissue 1 June 1970https://pubs.acs.org/doi/10.1021/ar50030a003htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Cation radicals and dications of metalloporphyrinsJack Fajer, Donald C. Borg, Arthur Forman, David Dolphin, and Ronald H. FeltonCite this: J. Am. Chem. Soc. 1970, 92, 11, 3451–3459Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical properties of solid oxide electrolytesT. H. Etsell and Spyridon N. FlengasCite this: Chem. Rev. 1970, 70, 3, 339–376Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Published inissue 1 June 1970https://pubs.acs.org/doi/10.1021/cr6…
Abstract The relative shear moduli of composites containing glass spheres in a rubbery matrix obey the Mooney equation, analogous to the relative viscosity of similar suspensions in Newtonian liquids. However, when the matrix is a rigid epoxy, the relative shear moduli are less than what the Mooney equation predicts b…
Abstract Some optical, dielectric and lattice properties of three alkaline earth fluorides (calcium, strontium and barium fluorides) and of two other isomorphous fluorides (cadmium and lead fluoride) are reported. Results obtained from experimental studies on infrared and Raman spectra give the fundamental transverse…
Abstract Alkali metals dissolve not only in liquid ammonia but also in ethers, such as tetrahydrofuran (THF), 1.2‐dimethoxyethane (DME), and dimethyl ether of diethylene glycol (diglyme), blue solutions being obtained 1,2 . “Blue” solutions can be obtained only with rigorously purified reagents in full absence of mois…
Abstract Dilute deaerated aqueous polyethylene oxide solutions have been irradiated with 60 Co γ‐rays. The concentration dependence of the gel dose, the dose required for gelation, was found to vary with the initial molecular weight of the polymer used. For low molecular weight polymer, with increasing polymer concent…
A new type of natural pyrrhotite, orthorhombic 11C type (a = 6.892, b = 11.952, c = 5.744 x 11 angstroms), and the hexagonal 6C type (a = 6.89, c = 5.76 x 6 angstroms) are described. Their compositions are Fe(10)S(11) and Fe(11)S(12), respectively. Pyrrhotites stable in nature have essentially stoichiometric compositi…
The ionic conductivity of pure as well as NaF- and YF3-doped CaF2 and SrF2 crystals was investigated between room temperature and 900°C. The absorption of the crystals was measured before and after X-ray irradiation. The results are in accordance with an anti-Frenkel disorder. While for CaF2 only the formation energy…