Materials Literature
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Abstract A technique is described which enables selected areas of a specimen to be located and examined using XPS. Results obtained using the technique are given which indicte that areas less than 0.5 mm square can be analysed.
The magnetostriction constants, λ 100 and λ 111 , of f.c.c. Ni-Co alloys have been measured in the temperature range between 77 and 450 K using the strain gauge technique. The sign of λ 100 changes from negative to positive with increasing Co content in the temperature range between 77 and 450 K, while the values of λ…
The total cross section for pair production by photons in the field of free electrons is fitted to simple analytic expressions in four intervals of the incident photon energy which cover the whole range between threshold and infinity
Abstract Bariumthioantimonate(III), Crystal Structure Ba 8 Sb 6 S17, prepared by fusion of the binary sulfides at 1120 K, crystallizes in the mono-clinic system (space group:P2/c) with a= 1141 ± 1 pm, b = 1373 ± 1 pm, c = 2253 ± 2 pm, β = 90.94 ± 0.05°. In the structure there are isolated distorted SbS 3 3- -trigonal…
Neutron time-of-flight powder data have been collected for forsterite [Mg2SiO4; Pbnm (D162h, No. 62); Z = 4, a = 4.7534 (1), b = 10.1989 (2), c = 5.9813 (1) Å] with the ZING-P′ high-resolution diffractometer at Argonne National Laboratory. Forty-seven variables, including anisotropic temperature-factor coefficients, w…
Using a simple new interferometric technique, the ordinary and extraordinary refractive indices of the nematic liquid crystal p-ethoxybenzilidene-p-n-butylaniline have been measured separately as a function of temperature. Changes in the refractive indices have been measured with an accuracy of ±0.005% and the absolut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular electron transfer from pentacyanoferrate(II) to pentaamminecobalt(III) via an imidazolate bridge. The role of distance in inner-sphere reactionsAlek P. Szecsy and Albert HaimCite this: J. Am. Chem. Soc. 1981, 103, 7, 1679–1683Publication Date (Print):April 1,…
Room-temperature studies of I-V characteristics and variation of both the dielectric constant and dielectric loss with frequency are presented for ZnO-Bi2O3 samples having different compositions and prepared by sintering at different temperatures. The nonlinearity parameter, dc resistivity, dielectric constant, and di…
Abstract For the first time the anisotropy of reflectivity of polarized infrared light of p‐(Bi 1– x Sb x ) 2 Te 3 single crystals (0.5 ≦ x ≦ 1) is given in the wave number range of 300 to 4000 cm −1 . In addition to the excitation of free carriers in the reflection spectra of the mixed crystals also interband excitat…
We report a study of the relative reactivity of the common amino acids and of their residues in lysozyme with osmium tetroxide, the osmium tetroxide-pyridine reagent, and with the oxo-osmium(VI)-pyridine reagent. With free amino acids, the osmium(VIII) reagents are most reactive with Met, Cys, His, Thr, Ser, Trp, Lys,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTENDOR study of oxovanadium(IV) tetraphenylporphyrin randomly oriented in rigid solutionCharles F. Mulks and Hans Van WilligenCite this: J. Phys. Chem. 1981, 85, 9, 1220–1224Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published inissue…
The zero-field susceptibilities parallel and perpendicular to the tetragonal axis of NiCl2⋅4SC(NH2)2 have been measured between 1.2 and 30 K and fitted to the usual spin Hamiltonian. The resulting parameters are D/kB = 7.6±0.4 K, z0J/kB = −4.5±0.3 K, g∥ = 2.26±0.03 and g⊥ = 2.34±0.03. The susceptibility has also been…
Growth of Co 3 O 4 layers on the (100) surface of single crystal CoO was investigated in air at 700° and 800° C. These layers were of duplex structure due to simultaneous inside and outside growth. Measurements on the position of inert gold markers demonstrated that cobalt migration outward in Co 3 O 4 was the dominan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrigins of homogeneous and inhomogeneous line widths of the 5D0-7F0 transition of europium(3+) in amorphous solidsJ. R. Morgan, E. P. Chock, W. D. Hopewell, M. A. El-Sayed, and R. OrbachCite this: J. Phys. Chem. 1981, 85, 7, 747–751Publication Date (Print):April 1, 1981Publi…
Programmed cooling experiments using a synthetic diopside glass and constant cooling rates of from l0o to 300oC,/hr first crystallize forsterite and then with decreasing temperature clinopyroxene + wollastonite. The forsterite grows as hopper-shaped crystals which then develop dendrites from external corners. The morp…
Abstract Allophanes with SiO 2 /Al 2 O 3 molar ratios from 1.38 to 1.92 were heated at temperatures up to 500°C, and the changes induced were investigated by means of infrared spectroscopy (IR) and X-ray powder diffraction (XRD). Heat treatment caused the IR absorption band near 1000 cm −1 due to Si-O stretching to sh…
The refractive indices and the densities of CB-7, PCH-7 and CCH-7 are measured. An equation that relates the optical frequency permittivity tensor to the molecular polarizability tensor for nematic liquid crystals is obtained. The derived equation gives consistent results not only for the nematic phase, but also for b…
Grain‐oriented ceramics of ferroelectric lead metaniobate have been prepared by molten salt synthesis of anisotropic crystallites followed by doctor blade casting. The sintered ceramics have an orthorhombic texture with elongated c axis grains parallel to the casting direction. This allows efficient poling in directio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the 1:2 aluminum trichloride-tetrahydrofuran complex AlCl3.2THFAlan H. Cowley, Mike C. Cushner, Raymond E. Davis, and Paul E. RileyCite this: Inorg. Chem. 1981, 20, 4, 1179–1181Publication Date (Print):April 1, 1981Publication History Publi…
An approach to determining synchronous machine parameters by low-voltage frequency response tests with the machine stationary will be described. The tests are simple and safe. In addition, they provide a more detailed and complete model of the machine than the accepted standard methods/1/. The standard tests rely heav…