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A formal derivation of an asymptotic expansion for the Helmholtz free energy FN of a system of N Λ-dimensional rigid spheres of diameter Σ is given, which has the form, FN / NkBT ∼ lim τ → 1 ν ln(λ / σ) − ν ln(τ − 1) + C + D(τ − 1) + E(τ − 1)2 + ···, where kB is Boltzmann's constant, λ is the mean thermal de Broglie w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnhydrous and hydrated rare earth acetylacetonates and their infrared spectraMary Frances Richardson, William F. Wagner, and Donald E. SandsCite this: Inorg. Chem. 1968, 7, 12, 2495–2500Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Pu…
The small-angle scattering of a non-graphitizable carbon produced from polyacrylonitrile is studied. The evaluation of the scattering data has been based on recent developments in small-angle scattering theory. The results show the existence of a micropore system with diameters in the 10–30 Å range. The average pore d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of pentacoordinate silicon. III. Tetramethylammonium bis(o-phenylenedioxy)phenylsiliconateF. Peter Boer, John J. Flynn, and June W. TurleyCite this: J. Am. Chem. Soc. 1968, 90, 25, 6973–6977Publication Date (Print):December 1, 1968Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,3-Di-tert-butylallene oxide. Isolation and isomerization to trans-2,3-di-tert-butylcyclopropanoneRonald L. Camp and Frederick Davis GreeneCite this: J. Am. Chem. Soc. 1968, 90, 26, 7349Publication Date (Print):December 1, 1968Publication History Published online1 May 2002P…
Extensive solid solution was observed in the system Pb(Sc 1/2 /,Nb 1/2 ,) 1‐x ,Ti x ,O 3 . In the range 0 ≤ x ≤ 0.425 a rhombohedral ferroelectric phase was stable at 25° C. In the range 0.45 ≤ x ≤ 1.00 a tetragonal ferroelectric phase was stable at this temperature. The phase diagram of the system below 500° C strong…
Spectral changes in iron(11) complexes caused by temperature changes have been examined. When the iron(11) ion is surrounded by six equivalent ligands (FeC12, FeBr2, FeI2, FeSiF6,6H2O) the band separation that arises from the splitting of the 5Eglevel decreases on cooling. The variation is proportional to the magnitud…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of halogen, substituent, and solvent on spin delocalization in high-spin, five-coordinated 2,6-diacetylpyridinebis(N-alkylimine)nickel dihalidesGerd N. La Mar and Luigi SacconiCite this: J. Am. Chem. Soc. 1968, 90, 26, 7216–7223Publication Date (Print):December 1,…
Tokiti Noda, Michio Inagaki, Shigehiko Yamada; A Comment on the Structure of Glassy Carbon, Bulletin of the Chemical Society of Japan, Volume 41, Issue 12,
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of the thermal decomposition of nickel tetracarbonylJ. Philip Day, Ralph G. Pearson, and Fred BasoloCite this: J. Am. Chem. Soc. 1968, 90, 25, 6933–6938Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Published ini…
An exact formulation is presented for the release of metallic fission products. Such radioactive atoms are created through fission processes inside the kernel of fuel particles. They can diffuse through the coating of a fuel particle and the surrounding charcoal matrix into the structural graphite of the reactor core.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermochemistry and oxidation potentials of manganese and its compoundsT. A. Zordan and Loren G. HeplerCite this: Chem. Rev. 1968, 68, 6, 737–745Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Published inissue 1 December 1968https://pu…
Abstract Results from previous work on clay-mineral complexes with dimethyl sulphoxide are taken as a starting point for the development of a method to identify kaolin in the presence of chlorite. The use of this method with artificial mixtures of these minerals, and with soil clays allows the detection of kaolin when…
Article The crystal structure of LiAlSi2O6 III (high-quartz solid solution) was published on December 1, 1968 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 127, issue 1-6).
Abstract High molecular weight aromatic polyketones were prepared from p ‐ and m ‐phenoxybenzoic acid in polyphosphoric acid by heating the reaction mixture at 100°C. High molecular weight aromatic polyamide was derived from the polyketone obtained through Schmidt reaction or Beckmann rearrangement. The polyamide obta…
Abstract Thin green clay layers and lenses in the lower part of the Lower Oligocene Kerkom Sand near Aardebrug, east of Louvain in Belgium, were found to consist of glauconitic illite. This mineral contains about equal amounts of iron and aluminium oxides (14%) and is therefore intermediate in chemical composition bet…
Huntite structure compounds with the formula REFe3B4O12 (RE = La3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+ and Y3+) have been synthesized. X-ray powder diffraction patterns and cell parameter data are reported. The infrared spectrum confirms the triangular coordination of boron in these compounds.
1. The function of the wild-type alleles of the pleiotropic mutants cysB and cysE of Escherichia coli was investigated. 2. The wild-type allele cysB(+) is dominant to the mutant allele cysB in stable and transient heterozygotes. 3. The wild-type allele cysE(+) is dominant to the mutant allele cysE, as predicted. 4. Su…
The importance of accurate high-temperature thermodynamic data for the study of anharmonic effects in solids is discussed, and an adiabatic calorimeter for the measurement of heat capacities in the temperature range 25-500 °C is described. The precision of the heat capacity data is about ±0·1% for T < 400 °C and ±0·2%…
Thermally crystallized glasses of compositions (Li 2 ,O 2 , MgO).Al 2 O 3 .nSiO 2 were studied by X‐ray powder diffraction methods. High‐quartz solid solution phases developed at relatively low temperatures and, for n 3.5, transformed at higher temperatures to keatite solid solution phases. Associated phases, if prese…