Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-aminoporphyrins. Preparation and metal complexes. Structure of N-tosylamino-5,10,15,20-tetraphenylporphinatonickel(II)H. J. Callot, B. Chevrier, and R. WeissCite this: J. Am. Chem. Soc. 1978, 100, 15, 4733–4741Publication Date (Print):July 1, 1978Publication History Publis…
Abstract The Eckart frame is a frame of orthonormal vectors e i , i = 1, 2, 3, which follow a vibrating molecule while it rotates. The frame is orientated by the so‐called Eckart condition, which Eckart found by requiring the Coriolis interaction to be minimal. In the present paper we shall see that Eckart's frame als…
The temperature dependences of the saturation magnetization of amorphous ferrimagnetic Co-Gd-Mo-Ar thin films have been analyzed in terms of the mean-field theory. This analysis yields the spin values of Co and the effective exchange interaction energies between Co-Co and Co-Gd atom pairs, which are then correlated wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of water absorbed in collagenC. A. J. Hoeve and A. S. TataCite this: J. Phys. Chem. 1978, 82, 14, 1660–1663Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July 1978https://pubs.acs.org/doi/10.1021/j100503a0…
Abstract The kinetics of craze growth from sharp cracks in polystyrene (PS) and poly(methyl methacrylate) (PMMA) in contact with liquid methanol were measured with time‐lapse photography as a function of the stress intensity factor K I . At high K I the craze length in both systems increases as √ t if the sides of the…
Homogeneous pseudobinary compound series of high magnetic anisotropy exhibit giant intrinsic magnetic hardness at cryogenic temperatures. This work presents data on the temperature and composition dependence of coercive force (${\mathrm{H}}_{c}$) in $\mathrm{Sm}{\mathrm{Co}}_{5\ensuremath{-}x}{\mathrm{Ni}}_{x}$ and $\…
Ternary diffusion theory is used to establish a criterion for the onset of an internal oxidation zone beneath the external scale when oxidizing conditions favor formation of the oxide of the less noble metal in a binary alloy. The problem is posed in terms of ternary solution thermodynamics and diffusion and is correl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerism and charge distribution in mixed-metal polyoxoanion clusters: oxygen-17 nuclear magnetic resonance structure determinations of cis-V2W4O194- and cis-HV2W4O193-W. G. Klemperer and Wilfred ShumCite this: J. Am. Chem. Soc. 1978, 100, 15, 4891–4893Publication Date (Pri…
Accurate X-ray structure factors of CaO, SrO and BaO were measured at 293 K from single crystals and analysed together with the data of Sanger [Acta Cryst. (1969), A25, 694-702] on MgO. The oxygen ion is seen to suffer an average compression and a fourth-order cubic harmonic type deformation, as compared to the atomic…
The crystal structures of the isomorphous complexes K3 [M(oxalate)3],3H2O, M = CrIII and AlIII, have been determined from three- dimensional diffractometer intensity data by conventional Patterson and difference Fourier techniques. The crystals are monoclinic; M = Cr, a 7.714(1), b 19.687(4), c 10.361(2) ?, ß 108.06(3…
The present oxidation study covers the 780°–1150°C temperature range using 0.001 Ω‐cm Si which is heavily B‐ and P‐doped Si in dry . Emphasis is on the lower temperatures thereby extending the scope of already published studies. For 0.001 Ω‐cm Si at temperatures greater than 1000°C, the over‐all oxidation rates were f…
Abstract The structure–property relationships of polyurethane elastomer derived from liquid hydroxylterminated polybutadiene/low molecular weight aliphatic diol/diisocyanate system were studied. The effects of the amount of low molecular weight diol on the mechanical properties of elastomer were discussed on the basis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-soluble lanthanide porphyrins: shift reagents for aqueous solutionWilliam DeW. Horrocks Jr. and Emmanuel G. HoveCite this: J. Am. Chem. Soc. 1978, 100, 14, 4386–4392Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 J…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and solid state studies of phthalocyanine thin film electrodesHiroyasu Tachikawa and Larry R. FaulknerCite this: J. Am. Chem. Soc. 1978, 100, 14, 4379–4385Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 J…
The energy levels of the vanadium atom in all of its stages of ionization, as derived from the analyses of atomic spectra, have been critically compiled. In cases where only line classifications are given in the literature, level values have been derived. The percentages for the two leading components of the calculate…
Wall effects on the Freedericksz transition have been calculated and used to evaluate the interfacial interactions between nematic molecules and substrates. A total reflection method was developed to observe the Freedericksz transition. Both the easy axis and the anchoring strength were measured on the interfaces betw…
Stromatoporoid cross‐sectional shape can be considered as a product of the interaction of three morphological variables: the relative proportions of basal, vertical and diagonal dimensions. The gross arrangement of internal lamination can be superimposed upon the resulting outlines. These shapes are taken to represent…
A study is presented of the liquid phase epitaxial growth of the quaternary mixed crystal Al y Ga 1 − y As 1 − x Sb x . Samples were grown over the composition range 0 < x < 0.2 , 0 < y < 0.6 , at temperatures from 785° down to 715°C, below which a miscibility gap in solid composition was observed. With the inclusion…
Abstract The energy distribution curves of the 2p core levels of pure and heavily doped Si are investigated using highly monochromatized (≈︁ 0.1 eV) synchrotron radiation (105 to 140 eV). Shifts and broadenings of the spectra with doping and with the energy of the exciting photons are observed and interpreted in terms…
Abstract The microdeformation morphology of a number of vinyl polymers with bulky side chains (type I) and arylene polymers with flexible oxygen linkages (type II) was studied by electron microscopy. The polyarylenes crazed only near the glass transition while the polyvinyls exhibited a crazing regime that extended to…