Materials Literature
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Abstract The reaction at the interfacial region of Cu/SiO 2 and Fe/SiO 2 heated in the high vacuum of an ESCA spectrometer has been studied. Copper spread slightly into SiO 2 at 500–800°C in the metallic oxidation state. Cupric oxide formed on SiO 2 changed to cuprous oxide or cuprous oxide plus copper metal and sligh…
The rare-earth oxysulfide La10S14O, doped with cerium, emits a bright luminescence band peaking around 6350 Å at room temperature. This red emission is quenched by copper impurities inadvertently present in insufficiently purified La10S14O. The Cu impurity in turn brings forth an emission band peaking around 7200 Å. T…
The paper describes the development and application of a hot-line insulator tester for the detection of defective suspension insulators. Concern over the quality of porcelain insulators and increasing line outage rates has renewed interest in programmed field testing of insulators. Field tests identified a need for a…
Brillouin scattering spectra of perovskite-type crystal CsPbCl 3 have been measured above its cubic-tetragonal phase transition temperature, T c =47^° C . The three elastic constants c 11 , c 12 and c 44 were determined in a wide temperature range. The result agrees quite well with that of the previous ultrasonic meas…
A series of polyoxamide homopolymers and regular copolyoxamides was prepared by liquid-liquid interfacial, gas-liquid interfacial, and solution polycondensation techniques. Thus, poly(hexamethylene oxamide) {Nylon 62}, poly(ethylene oxamide) {Nylon 22}, and poly(p-phenylene oxamide) were prepared in moderate molecular…
NMR and magnetization were measured at 4.2 K for Mn 2 VAl with the L2 1 structure. The 27 Al, 51 V and 55 Mn NMR signals were observed by the spin echo technique in zero external field at 28.2, 71.5 and 104.2 MHZ which correspond to the hyperfine fields of -25.4, -63.9 and -98.7 kOe, respectively. The saturation magne…
The extent of fracture of anodic oxide films during tensile deformation of aluminum is shown to be controlled by the density of defects in the oxide. The density of defects was monitored by the “leakage” resistance of the film, while the extent of fracture of the oxide was obtained from measurements of reanodization c…
Reinterpretation of the neutron diffraction study of 2H–TaSe2 by Moncton, Axe and DiSalvo (1977) reveals an ambiguity in the sense of the displacements proposed for the commensurate superlattice structure. We attempt to resolve this ambiguity by electrostatic and short-range energy calculations of the phase dependence…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUNIFAC group contribution method for silicone compoundsMordechay Herskowitz and Moshe GottliebCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 2, 407–409Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published inissue 1 April 1981ht…
The ${c}_{55}$ elastic constant of K${\mathrm{H}}_{3}$${(\mathrm{S}\mathrm{e}{\mathrm{O}}_{3})}_{2}$ and K${\mathrm{D}}_{3}$${(\mathrm{S}\mathrm{e}{\mathrm{O}}_{3})}_{2}$ has been investigated by Brillouin scattering in the vicinity of the ferroelastic transition in free crystal and under applied uniaxial stress. At z…
Abstract The kinetic equation for the pyrolysis gasification reaction of isotactic and atactic polypropylenes has been established. The difference in tacticity of the samples does not much affect the kinetic parameters. The exponent a of the intensity function I F = T δ a (K·sec a ), concerning the severity of decompo…
A hyperscaling relation v″ + 2v┴ = 2 – α is examined for the nematic to smectic A transition of 4-octyloxy-4′-cyanobiphenyl (8OCB) and 4-octyl-4′-cyanobiphenyl (8CB). From the heat capacity results, 2-α is analyzed to be 1.84 ± 0.03 for 8OCB and 1.75 ± 0.02 for 8OCB. On the other hand v″ + 2v┴ is calculated from the r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of sucrose in a CMSMPR evaporative crystallizerLeszek Sowul and Mary Anne Farrell EpsteinCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 2, 197–203Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published in…
An investigation of power frequency (50 Hz) surface partial discharges in dry air, using 21r/3 Rogowski profile electrodes in the low pressure range of 0.067 to 91.333 kPa, shows that for the discharges occurring symmetrically around the electrodes and just outside the uniform field region, the breakdown voltages are…
Magnetization measurements have been carried out to study various types of magnetism in degenerate magnetic semiconductors Sn 1- x (Me) x Te with different 3d transition metals Me=Cr, Fe, Co, and Ni. Of these impurities with x =1 at.%, only Cr and Fe act as ferromagnetic centers, while Co and Ni are magnetically ineff…
The characterization of radioactive corrosion products deposited on the internal surfaces of recirculation pipes was carried out to determine the deposited amounts and configurations. The test specimens were taken from the auxiliary pipes of the recirculation lines of Shimane Nuclear Power Plant after operation for ∼2…
Abstract The europium(II) orthoborate Eu3(BO3)2 is trigonal, space group R\bar3c, with a=9.069(1), c=12.542(2) Å and Z=6. The structure has been refined to R=0.082 for 259 observed reflections with isotropic thermal parameters. The borate contains isolated and planar triangle BO33− ions, the anions and Eu atoms being…
Abstract Tl 4 Ge 4 Se 10 crystallizes in space group C2/c with a = 15.602(6), b = 15.549(5), c = 9.052(3) Å, β - 107.10(3)° and Z = 4. The compound was prepared by fusion of a stoichiometric mixture of Tl 2 Se and GeSe 2 . The crystal structure is characterized by adamantane-like anions [Ge 4 Se 10 ] 4- and Tl + catio…
The nomenclature of replacement deposits is reviewed in terms of two processes, namely those involving the reaction between: (a) carbonate and siliceous rocks and (b) carbonate and unusual solutions, commonly, but not always, related to granitoids. ‘Wrigglite’ skarn is an example of a replacement deposit produced by p…
Abstract The new isotypic compounds BaGe 2 P 2 and BaGe 2 As 2 crystallize in the tetragonal system (P4 2 mc) with the following lattice constants: BaGe 2 P 2 : a = 761.8 ± 0.5 pm, c = 850.0 ± 0.5 pm, c/a = 1.12, BaGe 2 As 2 : a = 778.6 ± 0.5 pm, c = 866.4 ± 0.5 pm, c/a = 1.11. Fourbonded Ge atoms and twobonded P (As)…