Materials Literature
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Nuclear magnetic resonance and dielectric susceptibility data are reported in KTaO3: Li which show, for the first time, ordering of random-site electric dipoles in a nonpolar lattice.Received 29 September 1980DOI:https://doi.org/10.1103/PhysRevLett.45.1884©1980 American Physical Society
The rotational diffusion of rodlike $M\ensuremath{-}13$ viruses in solution has been measured at concentrations intermediate between the dilute and the concentrated regimes. The strong concentration dependence observed is in agreement with the Doi-Edwards model based upon simple steric hindrance arguments between rota…
The physical, structural, and mechanical properties of decrystallized cotton fibers prepared by preswelling in different concentrations of alkali followed by partial substitution—to nearly the same extent irrespective of the preswelling alkali concentration—by acetylation or cyanoethylation have been compared. The dec…
The experimental observations of the ferroelastic domain structure of CsPbCl3, in its monoclinic phase, are compared to the results obtained by a theoretical analysis using twinning by pseudo-symmetry, or a tensor method. The various kinds of observed domain walls are identified with the permissible W and S walls.
The effects of crosslinking upon the dynamic mechanical properties and swelling behavior of poly(acrylic acid) (PAA) have been studied. Materials were prepared by the free radical copolymerization of acrylic acid with varying amounts of the tetrafunctional monomer allyl acrylate (ALA). The results indicated a linear d…
The 153 Eu NMR and differential susceptibilities of EuSe 1- x S x with 0≤ x ≤0.3 have been measured as a function of temperature. The antiferromagnetic NNSS- type phase of EuSe is stabilized by substituting a small amount of sulfur ( x <0.1). The specimens with x ≥0.2 are ferromagnetic, and those with 0.1≤ x <0.2 are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR spectra of low-symmetry high-spin cobalt(II) complexes. 7. Trigonal-bipyramidal pentakis(picoline N-oxide)cobalt(II) perchlorateA. Bencini, C. Benelli, D. Gatteschi, and C. ZanchiniCite this: Inorg. Chem. 1980, 19, 12, 3839–3841Publication Date (Print):December 1, 1980Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR and optical studies of the interaction of alkali metal cryptates with the 9-fluorenone anion radical. Solvent effect on the equilibrium between contact and cryptand-separated ion pairsKazuo NakamuraCite this: J. Am. Chem. Soc. 1980, 102, 27, 7846–7848Publication Date (Pr…
Abstract The time dependence of the thermooxidative degradation was measured within the temperature range of 100–150°C. The extent of degradation was characterized by monitoring the content of hydroperoxy, hydroxyl, carbonyl, and quinone groups. Moreover, oxygen absorption, weight changes, and carbon dioxide formation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInduced optical activity in the terbium(III) complex of pyridine-2,6-dicarboxylic acid through association with resolved tris(ethylenediamine)chromium(III)John S. Madaras and Harry G. BrittainCite this: Inorg. Chem. 1980, 19, 12, 3841–3842Publication Date (Print):December 1,…
SUMMARY The accumulation of clay and organic material, forming argillans and organans, is poorly understood and is at least not a subject of general agreement. Electron scanning and microprobe show striking features. The argillans, having Si, Al and Fe, are clearly layered and seldom cracked. The organans do not conta…
Fluorescence spectra of MgP in triphenylene and phosphorescence spectra of CuP and PdP in triphenylene have been obtained from room temperature down to 10 °K. Analysis of the temperature dependence of the MgP spectra shows that the coupling between the Mg porphin guest and the triphenylene host is weak. A temperature-…
Abstract Die übermolekulare Struktur von Polyethylen niedriger Dichte ist elektronenmikroskopisch an chemisch gehärteten und kontrastierten Ultramikrotom‐Dünnschnitten untersucht worden. Der Innenaufbau der Sphärolithe aus Lamellen und die Eigenstruktur der Lamellen werden beschrieben. Die gefundenen Strukturen werden…
Abstract The gelation level attained in an unplasticized PVC pressure pipe determines the balance in the basic physical properties of strength, stiffness and ductility. In turn, the gelation level attained is dependent upon the processing conditions. Measurement of the gelation level can be used to control both the pr…
Abstract not Available.
Emission and excitation spectra of MgS: Sb 3+ phosphors are measured at various temperatures. In addition to the A , B and C excitation bands peculiar to Tl + -type ions, three bands corresponding to charge transfer transitions are observed. On each excitation band, distinct Jahn-Teller splitting is observed and the p…
The elastic moduli of both gray and nodular cast iron were measured by a pulse-echo elastic-wave technique at ambient and elevated temperatures up to 760°C. When compared at similar graphite contents, the elastic moduli of gray cast iron were much lower than those of nodular cast iron. These results are satisfactorily…
X-ray diffraction data for various materials reveal that naturally occurring microparacrystals cannot exceed a certain limiting size. The empirically obtained linear relationship between the square root of the limiting number of lattice planes within a paracrystal and the reciprocal value of the relative distance fluc…
Discontinuities corresponding to the simultaneous creation of two and possibly three electronic vacancies were observed in the absorption spectra of germanium. They occur at photon energies approximately equal to the energy required for the synchronous removal of two inner electrons. The magnitude of the observed disc…
The anomalous volume contraction ωa(T) of Fe-Ni and Fe-Pt Invar alloys were analyzed in terms of the Grüneisen equation using the experimental data of thermal expansion coefficient. It was found that ωa(T) increases with increasing Fe composition or temperature and remains nonzero even above the Curie point ϑ f for bo…