Materials Literature
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Abstract On heating at temperatures below 600°C kaolinite reacts with salts of alkali metals according to the equation 2SiO 2 · Al 2 O 3 · 2H 2 O + 2 n MX → 2SiO 2 · Al 2 O 3 · n M 2 O + 2 n HX + (2− n )H 2 O The reaction commences with the dehydroxylation of the clay and is favoured by high solubility of the salt and…
Abstract Four ternary compounds with the formulas CaMn 2 P 2 , CaMn 2 As 2 , SrMn 2 P 2 , and SrMn 2 As 2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in a CaAl 2 Si 2 -type structure (space group P3̅m 1-D 3 3 d) with the lattice constants: CaMn 2 P 2 a = 4,096 ± 0…
The metamagnetic behavior of the low temperature properties of single crystal Co(pyridine)2Cl2 is discussed. At 1.25 K oriented single crystals exhibit a two-step metamagnetic transition at applied fields ∼0.8 and 1.6 kG along the b-axis, a single transition at ∼0.7 kG for applied fields along the a* axis, and a singl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and structural relationships among the oligomeric compounds MFe(CO)4 (M = zinc, cadmium, mercury), iron lead tetracarbonyl, cobalt silver tetracarbonyl, and their Lewis base adductsRichard D. Ernst and Tobin J. MarksCite this: Inorg. Chem. 1978, 17, 6, 1477–1484Publ…
The room-temperature (295 K) crystal structures of potassium ferricyanide, K3[Fe(CN)6], have been determined for the simplest monoclinic (a reinvestigation) and orthorhombic polytypes by single- crystal X-ray diffraction. The monoclinic form is P21/c, a 7.047(3), b 10.400(3), c 8.384(3) ?, ß 107.29(3)°, Z 2. The iron…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of para substituent on rates of phenyl ring rotation in gallium complexes of para-substituted tetraphenylporphyrinsS. S. Eaton, D. M. Fishwild, and G. R. EatonCite this: Inorg. Chem. 1978, 17, 6, 1542–1545Publication Date (Print):June 1, 1978Publication History Publis…
Abstract Als erstes Rubidiumthioantimonit wurde aus wäßriger Sulfidlösung Rb 2 Sb 4 S 7 dargestellt und seine Kristallstruktur aufgeklärt. Die Substanz kristallisiert triklin in der Raumgruppe P 1 mit den Gitterkonstanten a = 968,0(5) pm, b = 1193,4(5) pm, c = 723,1(5) pm, α = 87,68(5)°, β = 101,39(5)° und γ = 102,66(…
The main electrochemical requirement for a dissolution-controlled cracking mechanism is considered to be a critical delay in the repassivation time during which a certain coulombic charge flows. The strain rate at the crack tip and the repassivation rate are in a permanent critical state of imbalance. After considerat…
Abstract Als erstes Cäsiumthioantimonit wurde die Verbindung Cs 2 Sb 4 S 7 aus wäßriger Sulfidlösung dargestellt und ihre Kristallstruktur aufgeklärt. Sie kristallisiert monoklin in der Raumgruppe P2 1 / c mit den Gitterkonstanten: a = 1111,2(5) pm. b = 1227,1(5) pm, c = 1163,7(5) pm, ß = 97,60(5)°. Die Elementarzelle…
It is observed that for the same peak flux density and the same operating frequency, the core loss induced by a square-wave voltage drive is less than the loss induced by a sinusoidal voltage drive, which is contrary to what one would normally anticipate. To the best of the author's knowledge, there Is no theory that…
Abstract A mechanism for the degradation of polymer molecules in ultrasonic cavitation has been proposed which takes into account the energy released by imploding cavitation bubbles in the form of hydrodynamic waves. Relationships for degradation rate constant and limiting chain length linking with the cavitation ener…
The levitation forces on metal spheres in magnetic fields of axial symmetry are derived theoretically. Criteria for stability of the center of mass are obtained. It is shown for nonmagnetic samples that the desirable coil configurations are those which provide a constant field gradient along the symmetry axis. The for…
Abstract Depending on the method of preparation ,,NiO”-single crystals of different colours can be synthesized. It is shown by ligand field spectroscopy that the ligand field and interelectronic repulsion parameters are the same for the green, yellow and brown crystals. There is definite spectroscopic evidence, that t…
Abstract The influence of sodium chloride on the atmospheric corrosion of mild steel has been studied. Samples covered with sodium chloride crystals (8 m̈g NaCl · cm −2 ) have been exposed to an SO 2 ‐free atmosphere at different relative humidities. The combined effect of sodium chloride crystals on a steel surface a…
The magnetisation and Mossbauer effect have been measured for the Invar type FCC Fe-Pt alloys. The atomic moment of the alloys varies linearly with concentration, following the Slater-Pauling curve, which indicates that the iron atom possesses a full moment of 2.7 mu B even in the Invar region. The hyperfine field act…
The method and results of high speed streak photography of surface flashover in vacuum are presented. It is shown that the bright phase of the flashover arc bridges a 12.5 mm gap in 0.15 ns. The streak records indicate that the flashover arc is preceded by an intense electron burst from the cathode-insulator junction.
General formulas are derived for the estimation of fiber orientation and distribution in fiber assemblies whose constituent fibers are arbitrarily crimped. It is found that the density function of orientation can be estimated by solving an integral equation which relates it to the average numbers of fiber cross sectio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental evidence for trapped valences in the mixed-valence complex .mu.-pyrazine-bis(pentaammineruthenium) tosylate. Electron paramagnetic resonance, magnetic susceptibility, and nuclear magnetic resonance resultsBruce C. Bunker, Russell S. Drago, David N. Hendrickson,…
Cross-linked polyethylene, now commonly used for insulation of underground electric distribution cables, is susceptible to electrochemical treeing, in common with other polymeric dielectrics. This treeing phenomenon sometimes originates at holes or cavities present in the cable. A polishing and etching technique has b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular antiferromagnetic exchange in tris(o-semiquinone) complexes of vanadium(III), chromium(III), and iron(III)Robert M. Buchanan, Hartley H. Downs, William B. Shorthill, Cortlandt G. Pierpont, Stephen L. Kessel, and David N. HendricksonCite this: J. Am. Chem. Soc.…