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Abstract A solubility diagram was developed that shows the activity of various ionic and molecular species of Si in equilibrium with amorphous silica as a function of pH. Below pH 8.0 only uncharged Si(OH) 4 contributes significantly to total soluble Si. The solubility of Si was measured on two soils in which equilibr…
Abstract In addition of the piezochromic and the photochromic (dimer A) dimers of 2,4,5-triphenylimidazolyl, two new isomeric dimers were prepared; one (dimer B) being photochromic and the other (dimer C) non-photochromic. Several p-substituted derivatives of the dimers were also prepared. By comparison of their NMR a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Bonded azo-transition metal complex. Structure of bis(tert-butyl isocyanide) (azobenzene)nickel(0)Ron S. Dickson and James A. IbersCite this: J. Am. Chem. Soc. 1972, 94, 9, 2988–2993Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Publis…
CsAlSi 2 O 6 , CsAlGe 2 O 6 , CsFeSi 2 O 6 , CsFeGe 2 O 6 , and CsBSi 2 O 6 were prepared by reaction of Cs 2 CO 3 and oxides and by a base‐exchange method. The compounds were characterized by optical examination and X‐ray diffraction. Dilatometric measurements of the linear thermal expansions of the cubic silicate po…
Anomalous thermal expansion is treated through an analytical approach, based on the anharmonic behavior of lattice vibrations of the solids CuCl and CuBr of which complete ir spectroscopic data were available for the low temperature region. In the two cases examined here, anomalous thermal expansion as well as change…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPulse radiolysis of aqueous thiocyanate solutions. Nature of the intermediate transient speciesD. Behar, P. L. T. Bevan, and G. ScholesCite this: J. Phys. Chem. 1972, 76, 11, 1537–1542Publication Date (Print):May 1, 1972Publication History Published online1 May 2002Published…
The Orowan, Petch, and Knudsen equations were examined against 46 sets of strength‐vs‐grain‐size data. For the 30 sets which are most discriminating, represented by 229 averaged‐data points, the variances of the Orowan‐Petch and Knudsen treatments are ∼4.5 and ∼17.1 kpsi 2 , respectively. Statistical considerations gi…
Abstract The corrosion of Ti‐6Al‐4V at 37°C in several simulated body fluids and bovine plasma was studied using the passive current‐time technique. A 0.9% NaCl (bw)‐0.1 N NaH 2 PO 4 solution gave results closest to those using bovine plasma as an electrolyte. All of the samples showed an activation period of 10–15 hr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of (C5H5)Rh(C2F4) (C2H4). Comparison of rhodium-ethylene and rhodium-tetrafluoroethylene bondingLloyd J. Guggenberger and Richard CramerCite this: J. Am. Chem. Soc. 1972, 94, 11, 3779–3786Publication Date (Print):May 1, 1972Publication History Published onl…
Sound velocity and absorption coefficient have been measured for three antiferromagnetic crystals—MnO, CoO, and NiO—at 23±1°C by the pulse superposition method and the pulse-echo method, respectively. Elastic constants have been calculated from the velocity data: c11 = 22.20, c12 = 10.99, c44 = 7.83 for MnO: c11 = 25.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilane reductions in acidic media. I. Reduction of aldehydes and ketones in alcoholic acidic media. General synthesis of ethersMichael P. Doyle, Donald J. DeBruyn, and Dale A. KooistraCite this: J. Am. Chem. Soc. 1972, 94, 10, 3659–3661Publication Date (Print):May 1, 1972Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorogenic ninhydrin reaction. Structure of the fluorescent principleM. Weigele, J. F. Blount, J. P. Tengi, R. C. Czajkowski, and W. LeimgruberCite this: J. Am. Chem. Soc. 1972, 94, 11, 4052–4054Publication Date (Print):May 1, 1972Publication History Published online1 May 2…
The structure of NaNbO3, phase T2 (immediately below the cubic phase), has been determined from lattice parameters and difference reflections. It is tetragonal C-face-centred, with a= 7·8698(8) Å, c=3·9428(4) Å at 600°c. It corresponds to condensation of an M3 soft-phonon mode from the cubic phase, in contrast to SrTi…
This paper reports field-induced realignment of a nematic liquid crystal. A thin nematic film, which has a negative dielectric anisotropy, is initially homeotropic. Application of a threshold field parallel to the optic axis distorts the nematic ordering and increases the film's birefringence in certain light-propagat…
This paper reports the results of extensive examination of 15 kV and 22 kV polyethylene insulated cables which had been in service for periods of time ranging from less than one year to eight years. Evidence of treeing and related insulation deterioration at normal operating voltage is presented. The investigation is…
The theory of plasmon satellites in experiments where ion cores are excited is developed in a manner which complements the work of one of the authors, which showed how the interaction of slow electrons with plasmons could be treated to all orders in perturbation theory in a certain approximation. Here the fast-electro…
Pyruvate formate-lyase has been demonstrated in Clostridium kluyveri, C. butylicum and C. butyricum. The properties of the clostridial enzyme have been studied in more detail in cell-free lysates of C. butyricum. The following activities were investigated: pyruvate cleavage to acetylBiochemisches Institut der Universi…
Resonance Raman spectra have been obtained from the MnO4 - and CrO4 2- ions in aqueous solutions and as solid. High intensity overtone progressions of the totally symmetric vibration v 1 were observed, allowing estimates of the anharmonicity constants and harmonic frequencies to be made for the v 1 breathing mode. Rel…
Analytical parameters have been recalculated for atomic scattering factors and incoherent scattered intensities of the elements of atomic numbers 2 to 36, based on the tables of Tavard, Nicolas & Rouault [J. Chim. Phys. (1967), 64, 540]. The fit has also been checked with the total scattered intensities.
Abstract A systematic method is described for determining the double‐force tensor of point defects in cubic crystals by analysing diffuse X‐ray scattering in the immediate vicinity of Bragg reflections (Huang‐scattering). Around a given reciprocal lattice point there may occur three types of isointensity surfaces depe…