Materials Literature
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The intermetallic compound Fe 3 Sn 2 has been studied by Mossbauer spectroscopy and magnetisation measurements. This compound is ferromagnetic from approximately 220K to T c =657K. In this temperature range, the spin directions are close to or parallel to the c axis while at low temperature they are perpendicular to i…
Abstract The transition between the amorphous state and 3 crystalline modifications of poly(ε‐caprolactam) (polyamide‐6) has been investigated in Part 1 by IR spectroscopy. With these results as background the relation between heat of fusion Δ H * and specific volume v is now investigated as a function of crystallizat…
Abstract The hydrated form of tubular halloysite [halloysite (10 Å)] was observed by a conventional electron microscope equipped with an environmental cell (E.C.), by which the “natural” form was revealed without dehydration of the interlayer water. This study mainly reports the selected area electron diffraction (SAE…
The numerical solution of the Clausius-Mossotti problem for the permittivity of a suspension of perfectly conducting spheres in a cubic array is presented for sc, fcc, and bcc lattices. The results apply to electrical permittivity, magnetic permeability, electrical and thermal conductivity, and particle diffusivity. T…
The unmetamorphosed equivalents of the regionally metamorphosed clays and marls that make up the Alpine Liassic black shale formation consist of illite, irregular mixed-layer illite/montmorillonite, chlorite, kaolinite, quartz, calcite, and dolomite, with accessory feldspars and organic material. At higher grade, in t…
This investigation is concerned with the effect of chromium and molybdenum on the formation of the passive film of stainless steels, and its corrosion resistance to the chloride ion. The corrosion resistance to the chloride ion was estimated by the potential decay method and the measurement of the anodic polarization…
The crystal structures of the high pressure Ga(II) and Ga(III) forms of gallium were studied by single-crystal x-ray diffraction using a diamond anvil device. Ga(II) has a body-centered-cubic structure with a=5.951±0.005 Å and 12 atoms in the centered cell; Ga(III) has a body-centered-tetragonal cell with a=2.813±0.00…
The localization and synthesis of alphafoetoprotein (AFP) during mouse embryogenesis were studied by immunoperoxidase and by immunoprecipitation after radioactive labelling, using an antiserum prepared against AFP. AFP is first detectable in embryos on the 7th day of gestation (7th day embryos). In 7th and 8th day emb…
Abstract Reinforcement mechanisms of fiber‐glass reinforced plastics (FRP) under wet conditions are reviewed with emphasis on molecular structures of glass/matrix interfaces. Included are studies on glass surface, the glass/coupling agent interface, silane coupling agents on glass surfaces as well as in solution, the…
Abstract TlGaSe 2 kristallisiert monoklin mit a = 10,772(3) Å; b = 10,771(5) Å; c = 15,636(8) Å; β = 100,6(3)°; Z = 16; Raumgruppe Cc. Nach der Verfeinerung mit 1366 unabhängigen Reflexen ergab sich ein R‐Wert von R = 0,082 (MoKα‐Strahlung). Die Verbindung bildet ein Schichtengitter mit zwei Anionenschichten parallel…
Using the R-line fluorescence of trace Cr3+ in sintered Al2O3 as an example, a method of analysis is outlined for determining the residual microstress and macrostress in a polycrystalline aggregate. It uses the shift and broadening, induced by residual stress, of a line due to a transition in an atomic system dissolve…
A chemical-bond approach reveals the possibility of several unusual bonding configurations that have relatively low energy in materials with lone-pair valence electrons. Valence-alternation pairs (V.A.P.) are the lowest energy charged defects. The interconversion between positive and negative centres is described in d…
Using muffin-tin orbitals and the atomic-sphere approximation, we have studied the band structures of Chevrel-phase molybdenum chalcogenides, ${M}_{m}{\mathrm{Mo}}_{6}{X}_{8\ensuremath{-}x}$. Generally, these compounds exist for a broad variety of elements, $M=\mathrm{Pb},\mathrm{Sn},\mathrm{Ag},\mathrm{Cu}$ and $X=\m…
The no-reflow phenomenon was studied following reconstitution of blood flow by microvascular anastomosis in an ischemic and denervated free epigastric flap in the rabbit. Microscopic, histological, angiographic, and hematological studies demonstrated the progressive nature of this obstruction to the peripheral blood f…
ABSTRACT The interference reflexion microscope may be used to examine the pattern of cell-substratum separation of cultured cells. Earlier studies on chick fibroblasts using this technique identified 3 types of separation: (1) focal contacts, representing approx. 10—14 nm separation and which are sites of cell-substra…
Abstract The equilibrium melting temperature, volume, and enthalpy and entropy changes on melting of poly(ethylene terephthalate) have been analyzed and heats of fusion have been newly measured with an automated scanning calorimeter to yield the following data: 553°K, 16.9 cm 3 /mole, 2.69 kJ/mole, and 48.6 J/deg/mole…
Abstract Besides mechanical blending and copolymerization there is a third possible way in which two polymers can be combined. Each polymer forms its own network, while both networks interpenetrate each other. There are no covalent bonds between the polymers. Such interpenetrating networks have been synthesized sequen…
The Voigt function provides a rapid and easily applied method for interpreting the breadths of diffraction profiles in terms of specimen defects and for studying absorption or emission spectra. In the past, approximate methods have usually involved the assumption that the constituent profiles are either Cauchy (Lorent…
Abstract Einkristalle der Titelverbindung mit x=14‐16 werden erhalten durch langsame Wasserdampfdiffusion in Lösungen von Fe3+ und Fe(CN)64‐ in konz. HCl.
Abstract The lamellar structure of certain polyethylene spherulites grown very slowly at low supercoolings (regime I crystallization) has been exposed by using new techniques. A highly regular texture is found whose main element is ridged sheets of alternating {201} facets, ca. 1 pm wide, growing outwards with b as sp…