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The intensity of specularly reflected [(00) reflection] low-energy (5-500-eV) electrons has been measured as a function of temperature for the (100) and (111) faces of palladium and for the (111) face of lead in the temperature ranges 25°-600°C and 25°-225°C, respectively. From the data, the root-mean-square displacem…
Abstract : The degree of long-range order has been determined for 20 binary A15-type phases containing various transition elements. A tendency toward a lower degree of order was noted as the component elements were chosen successively from columns in the periodic table approaching the Mn column. A comparison of the or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible quintet-singlet transition in dithiocyanato-bis(2,2'-dipyridyl)iron(II)Edgar Koenig, K. Madeja, and Kenneth J. WatsonCite this: J. Am. Chem. Soc. 1968, 90, 5, 1146–1153Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published…
The unpolarized optical absorption spectra of the sheet silicate minerals muscovite, lepidolite, and fuchsite have been examined. The spectra, interpreted on the basis of ligand field theory, indicate that all three minerals contain Fe 3+ and possibly Ti 3+ in octahedral sites. In addition, muscovite is shown to conta…
<div class="htmlview paragraph">A single cylinder investigation was conducted to determine concentration of oxides of nitrogen resulting from combustion of ammonia and air in a spark ignition engine over a range of fuel-air ratios typical of normal engine operation with ammonia. Nitric oxide concentrations excee…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation ROBERT HEIDERSBACH; Clarification of the Mechanism of the Dealloying Phenomenon. CORROSION 1 February 1968;…
The dc and microwave magnetic properties of single crystals of Ba4Zn2Fe36O60(ZnU) were investigated. The saturation magnetization ‖ and ⊥ to c, anisotropy constant and anisotropy field were determined as a function of temperature from 4.2 to 600°K. TC = 673±2°K. At room temperature 4πMs = 3700 G, K1 = 1.4×106 ergs/cm3…
High-yield photoemission, already reported for GaAs-Cs, is also observed for GaAs-Cs-O. Spectral distributions of yields from both GaAs and tungsten with surface coatings of Cs-O indicate that the work function of such coatings is at least as low as that of GaAs-Cs. Photoemissive yields from GaAs-Cs-O have approximate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of dimeric dithiolene complexesAlan L. Balch, Ian G. Dance, and Richard H. HolmCite this: J. Am. Chem. Soc. 1968, 90, 5, 1139–1145Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published inissue 1 February 1968https://…
This paper reviews work since 1961 on magnetostriction, including both its sources and its temperature and magnetic field dependence beyond saturation (forced magnetostriction). A statistical theory of the magnetostriction of ferromagnets is in fine agreement with experiments on nickel and on heavy rare-earth metals,…
Spherical Fe–Ni (50–50) single crystals were ordered by neutron irradiation at 295°C in the presence of a magnetic field. Magnetization curves and magnetic anisotropy energy measurements demonstrate the very important directional effect of the irradiation magnetic field on the bulk anisotropy of the single crystal. Wh…
Electrical resistivities of pure and vanadium-doped single crystals of Ti2O3 have been measured as a function of applied magnetic field strength and temperature. The anomalous high-temperature increase in electrical conductivity has been confirmed. It is argued that the symmetry of Ti2O3 leads naturally to a two-band…
Emission, absorption and reflection spectra have been studied on single crystals of cuprous halides. Three types of emission are observed: 1) resonance emission due to the annihilation of the lowest energy intrinsic exciton, 2) narrow lines due to bound excitons at defects or impurities, 3)broad bands and overlapping…
Investigations of the magnetic properties in the ordered CuAu-I-type manganese alloys are reviewed. The formation of the ordered phase and the possible magnetic structures are discussed. New experimental results for the Mn-Ni, Mn-Pd, and Mn-Pt systems are reported. Neutron diffraction shows the basic antiferromagnetic…
Results of laboratory sulfide corrosion cracking tests on commercial steel alloys are presented. Emphasis is placed on effects of environmental factors, alloy composition and metallurgical variables. Environmental factors studied include pH in the range of 2 to 5, H2S partial pressures in the range 0.001 to 1.0 atmosp…
1. Growth of Escherichia coli on glucosamine results in an induction of glucosamine 6-phosphate deaminase [2-amino-2-deoxy-d-glucose 6-phosphate ketol-isomerase (deaminating), EC 5.3.1.10] and a repression of glucosamine 6-phosphate synthetase (l-glutamine-d-fructose 6-phosphate aminotransferase, EC 2.6.1.16); glucose…
The intensities of low-angle neutron-diffraction peaks have been measured for the antiferromagnetic solids MnO, α-MnS, and NiO. From the reduced intensities of the (111) magnetic peaks the following covalency parameters have been derived: Aσ2 + 2Aπ2 + As2 = 3.5% (MnO); 7.6% (α-MnS); Aσ2 + As2 = 3.8% (NiO).
The kinetics of the aragonite-calcite transformation were studied in aqueous solution to determine the factors involved in the process of calcite crystallization and the controlling diagenetic conditions for the aragonite-calcite transformation. The reaction involved the solution and equilibration of aragonite with th…
Crystallographic, magnetic, and electrical studies of the system La1−xSrxCoO3.00±0.01 for 0≤x≤0.5 give indirect evidence for the presence of chemical inhomogeneities separating strontium-free regions, where localized ``3d'' electrons occur at thermally excited high-spin Co3+ ions, from strontium-rich regions, where th…
Abstract Thermotropic mesomorphous phases such as occur in the melts of many organic substances are considered. Though mesomorphous melts were first observed by Reinitzer in 1888, fundamental structural problems regarding such melts have not, as yet, been completely solved. Part I of this article deals mainly with suc…