Materials Literature
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The inception of ac treeing has been investigated in various cast epoxy resins, using a needle-plane test configuration. Mechanical stress due to shrinkage in the curing process is present at the needle tip, and in some cases causes micro-cracks. Lower tree inception voltages were observed in mechanically stressed spe…
The effect of heating on the substructure of heavily rolled 70:30 brass is described. Colonies of very fine ‘recovery’ twins (0.002–0.01 μm thick) develop in the shear bands at an early stage of heating and subsequently grow lengthwise in the matrix. Dislocation loss from the matrix regions associated with the recover…
Electrical conductivities and thermoelectric power of the complexes of phthalocyanine with halogen (iodine or bromine) have been studied. The electrical conductivity of phthalocyanines exposed to halogen vapor increases drastically up to 10 to 11 orders of magnitude, and its activation energies of the complexes with h…
Absorption and magnetic circular dichroism spectroscopy have been used to study the cubic crystal Cs2NaTmCl6. Transitions between the Oh crystal field levels in 3 H 6 and 3 H 4, 3 F 3, 3 F 2, 1 G 4 and 1 D 2 have been observed and assigned. Rich vibrational structure was observed in all transitions and the vibrations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-bound sulfonylhydrazine functionality. Preparation, characterization, and reactions of copoly(styrene-divinylbenzenesulfonylhydrazine)David W. Emerson, Richard R. Emerson, Surendra C. Joshi, Elizabeth M. Sorensen, and James E. TurekCite this: J. Org. Chem. 1979, 44,…
A bstract The VLF response of laterally inhomogeneous and anisotropic models is calculated numerically using the finite element method. Some results are presented for a slab model in terms both of the polarization parameters, i.e., the tilt angle and ellipticity of the magnetic polarization ellipse, and the amplitude…
Magnetoelectric effect of the low temperature phase of magnetite was measured at 77 K. It was confirmed that the magnetic crystal symmetry at 77 K is triclinic but the breaking of the mirror symmetry parallel to the (1\bar10) plane is very small. Dispersion of the magnetoelectric effect was observed with the relaxatio…
Small bore Inconel Alloy 600(1) tubing exhibits classical crevice behavior in an appropriate high temperature aqueous environment and is therefore useful for studying the crevice chemistry of this alloy in systems which are not readily amenable to crevice simulation by external electrochemical control. Experiments in…
The magnetic structure of Mn 4 N is shown to be not exactly of ferrimagnetic collinear type. Experiments using, separately, non-polarised and polarised neutrons reveal the existence of a small triangular magnetic component on each of the Mn atoms that are at the centres of the faces of the cubes.
The effect of pronounced pairing of oppositely charged defect centres on a.c. conduction in chalcogenide glasses is discussed. It is concluded that for this non-random case, the conductivity should be fairly accurately linear with no temperature dependence for some typical chalcogenide glasses. However, for certain co…
Abstract The radial coatings of Holocene ooids from Baffin Bay, Texas, are Mg-calcite, whereas the tangential and micritic coatings are aragonite. Centrifugally deposited ooid coatings are similar in many respects to centripetally deposited marine cements. The reason(s) for the mineralogical and textural variation in…
The electrochemical behavior of titanium in deoxygenated acidic chloride solutions, with and without additions of Ti(III) and Ti(IV) ions, has been determined and compared with that observed in acidic sulfate media. A monolayer mechanism has been developed for the active‐state dissolution and passivation of titanium i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosensitization of titanium(IV) oxide with tris(2,2'-bipyridine)ruthenium(II) chloride. Surface states of titanium(IV) oxideA. Hamnett, M. P. Dare-Edwards, R. D. Wright, K. R. Seddon, and J. B. GoodenoughCite this: J. Phys. Chem. 1979, 83, 25, 3280–3290Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of metal-ion complexation with N-methyltetraphenylporphyrin. Evidence concerning a general mechanism of porphyrin metalationMarilyn J. Bain-Ackerman and David K. LavalleeCite this: Inorg. Chem. 1979, 18, 12, 3358–3364Publication Date (Print):December 1, 1979Publicat…
Measurements of average magnetic susceptibility and magnetic anisotropy on the single crystals of FeTPP in the 4-300 K temperature r ange are reported. These results together wi th the other existing evidence establish an S = 1 spin state for the iron(I1) ion in FeTPP. It is shown that the experimental principal susce…
The variation in stress corrosion susceptibility and cracking morphology of sensitized Type 304 stainless steel in high purity water is reported as a function of combinations of oxygen (0.01 to 8 ppm) and temperature (75 to 288 C). The results are discussed both in terms of the fundamental parameters involved in stres…
The structure of BiVO4 has been determined by the Rietveld method at 300, 573 and 898 K and confirms the space group of the ferroelastic phase as 12/a and that of the paraelastic phase as 141/a. The displacement vectors of the atoms involved in the switching of ferroelastic states are calculated and indicate that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAllotropic transitions of magnesium nickel hydride (Mg2NiH4)Z. Gavra, M. H. Mintz, G. Kimmel, and Z. HadariCite this: Inorg. Chem. 1979, 18, 12, 3595–3597Publication Date (Print):December 1, 1979Publication History Published online1 May 2002Published inissue 1 December 1979h…
First-of-a-kind fission-heated experiments utilizing uranium oxide particles in liquid sodium have been performed to assess the nature of the passive heat transfer between fast reactor fuel debris and overlying coolant. The experiments were designed to simulate the situation following a core disruptive accident in whi…
Dielectric anisotropy of heavy ice Ih is examined in a wide temperature range by measuring the complex dielectric constants parallel and normal to the c axis, and it is compared with that of ordinary ice Ih (H 2 O ice). The increased anisotropy in the static dielectric constants including only the shift of the extrapo…