Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract SrNiO 2 ‐Einkristalle wurden bei hohen Temperaturen unter O 2 ‐Druck dargestellt. SrNiO 2 ist isotyp mit SrCuO 2 (Raumgruppe D —Cmcm, a = 3,581, b = 16,362, c = 3,915 Å) Die kristallchemische Verwandtschaft zum K 2 NiF 4 ‐Typ wird diskutiert.
The effect of cobalt substitutions in manganese zinc ferro ferrites for inductor applications is discussed. Permeability-temperature curves are presented over the range -50 degrees C to 200 degrees C for compositions where the cobalt level is varied between 0 and 0.010 per formula unit, the Mn/Zn ratio and Fe 2+ level…
Abstract The Mössbauer spectra of graphite–FeCl3 and graphite–FeCl3–AlCl3 compounds with varying FeCl3/AlCl3ratios were measured. At 298 K, the isomer shift of the Fe3+ peak of FeCl3 intercalated in the graphite–FeCl3 compounds was larger than that of pure anhydrous FeCl3, and two sets of Fe2+ quadrupole doublets appe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual hydrogen bonds. A neutron diffraction study of the hydrogen dinitrate ion, (O2NO.cntdot.H.cntdot.ONO2)-, in cesium hydrogen dinitrateJacques. Roziere, Marie T. Roziere-Bories, and Jack M. WilliamsCite this: Inorg. Chem. 1976, 15, 10, 2490–2494Publication Date (Print)…
The use of triazole, benzotriazole, and naphthotriazole as corrosion inhibitors for brass is briefly reviewed. The corrosion of 70/30 brass immersed in a wide range of solutions is reported both with and without the inhibitors. The inhibitor efficiency of benzotriazole is given as a function of the solution pH and the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered and disordered phases in mixed dodecylammonium and hexadecylammonium tetrachloromanganate(II)Vincenzo Salerno, Andrea Grieco, and Michele VacatelloCite this: J. Phys. Chem. 1976, 80, 22, 2444–2448Publication Date (Print):October 1, 1976Publication History Published o…
An analysis of stress distributions within circumferential clasp arms with various tapers, was undertaken in an effort to (1) determine the area of maximum stress concentration in both tapered and non-tapered clasps, and (2) to compare this point of maximum stress concentration with the area of frequent clasp breakage…
Electron-paramagnetic-resonance conversion-rate measurements combined with optical-absorption data in Ni-doped ${\mathrm{SrTiO}}_{3}$ have been carried out. From these experiments in oxidized and reduced crystals, assignment of the photochromic bands in the visible could be made and the trapping mechanism identified.…
New materials for optical thin films are presented. Zirconium oxide, titanium oxide, cerie oxide, and hafnium oxide in the form of black tablets or cones of various sizes for the electron beam evaporation technique were developed. These materials are oxygen depleted and give an uniform melt during the evaporation to g…
An investigation to determine the number of proteins comprising the keratin of the chick down feather was carried out using anion‐exchange chromatography of the carboxymethylated derivatives of reduced feather proteins, followed by examination of discrete protein fractions by polyacrylamide gel electrophoresis at pH 9…
Abstract The low‐temperature heat capacity of collagen (in the hydrated and dehydrated states) and the large entropy of collagen in the coiled state relative to the same protein in the helical state were investigated. The heat capacity for collagen in the solid state in the temperature range 4°–50° K changes proportio…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Monoclinic unit-cell parameters for LnPO4 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy) have been redetermined from Guinier photographs, and are plotted against effective ionic radii of the lanthanides. Full powder-diffraction data are given for LaPO4 and GdPO4.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrahalo- and (mixed-tetrahalo)cuprates of the piperazinium dication. Coordination geometry changes in some CuX42- anionsGiuseppe Marcotrigiano, Ledi Menabue, and Gian C. PellacaniCite this: Inorg. Chem. 1976, 15, 10, 2333–2336Publication Date (Print):October 1, 1976Publica…
Abstract Polyvinylamine which contained 95.6 mol% amine units was obtained when the Hofmann degradation was applied to polyacrylamide by use of a very slight excess of sodium hypochlorite and a large excess of sodium hydroxide at 0 to −15 °C for about 15 h. Polyvinylamine hydrochloride (PVAm·HCl) was isolated almost q…
For ${\mathrm{Cd}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{O}_{4}$ and ${\mathrm{Zn}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{O}_{4}$, the conduction-electron concentration has been varied over a wide range without the introduction of $B$-site impurities or defects. Analysis of the $^{57}\mathrm{Fe}$ M\"ossbauer-effect data i…
Ellipsometry studies of evaporated aluminum films anodized in 0.6 M H 3 PO 4 at constant current indicate that the anodic oxide produced is at first homogeneous with a refractive index of 1.62, as found for barrier anodic oxide of thin film and bulk Al. As the thickness increases, the optical properties change signify…
Abstract The F + charge state of the oxygen vacancy in ZnO is created by means of an electron irradiation performed at an energy lower than the energy threshold for zinc displacements. Charge state changes of this defect observed by EPR under illumination are also described.
Several approximate procedures for the calculation of the intensities of atoms elastically scattered from solids are compared with nearly exact quantum calculations from a sinusoidal hard wall potential. The quasiclassical method reproduces the qualitative features of the ’’rainbow’’ envelope of the scattered intensit…
Abstract Photoinduced free radicals in cellulose were studies by means of ESR spectroscopy. Plausible mechanisms have been suggested for each type of intermediate radical to account for the ESR spectra observed and for the product balances. Based on the principles of photochemistry of cellulose, coupled with the findi…