Materials Literature
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Abstract Thermoelectric power and de electrical conductivity measurements are made on MoTe 2 single crystals in a wide temperature range (77 to 770 K). The results are analyzed on the basis of impurity conduction. It is shown that three processes contribute to the total conductivity: hopping conduction between impurit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of Poly(urethanes) and Poly(sulfonates) Containing Tetrathiafulvalene Nuclei in the BackboneCharles U. Pittman Jr., Yeon-Fong Liang, and Mitsuru UedaCite this: Macromolecules 1979, 12, 4, 541–546Publication Date (Print):July 1, 1979Publication History Published onl…
Abstract The complex thermoanalytical investigation of oil stability has been made by means of the Derivato‐graph using dynamic and static programs. TG, DTG and DTA curves have been registered simultaneously. The aim of the experiments was to determine the optimum conditions for examination of oxidative stability and…
Abstract The mixed Sn(II)/Pb(II) compounds of the type CH 3 NH 3 [PbwSn 1-n X 3 ] (X=Cl, Br, I) have the cubic perovskite structure which is established by X-ray powder data and 119 Sn Mössbauer spectroscopy. With exception of the chloro system the coloured compounds show electrical conductivity which increases with i…
Crystallization of V 2 O 3 from V 2 O 3 P 2 O 3 , glasses containing 0 to 9 mol% B 2 O 3 , during heat treatment in the range 220° to 410°C, caused progressive micro structural changes which dramatically affected the electronic conductivity (γ), the activation energy for conduction ( W ), and the resistance to chemica…
Electrochromism in SrTiO3 : Ni at 200–300°C has been investigated by electrical and optical measurements. (NiTiVO) ′ and Ni′Ti constitute the color centers on the cathode and anode sides, respectively. Oxygen vacancy drift determines the kinetics during the early state of coloration and during the entire process of bl…
A sequence of laminated sediment, 30 cm long, deposited in the deepest part of an eutrophic lake, Lovojärvi, in southern Finland, was analyzed microscopically. Seasonal changes in sedimentation were found to be well retained, due to the absence of bottom animals and the rather high sedimentation rate. Delimitation of…
Abstract A model is presented to account for the large variations in tensile and tensile impact strength of amorphous polymers from a consideration of an idealized entanglement network. The material strength under tensile impact conditions is shown to be predictable and to increase with the “fineness” of the entanglem…
Elastic fields of dislocation walls at the interface of a bicrystal are determined in both the isotropic and anisotropic cases. Singularities at the interface are represented in terms of line force fields. It is shown that the long–range portion of the stress field of the wall can be removed without introducing incomp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure and Temperature Dependence of the Viscosity of Polymer Solutions in the Region of Phase SeparationB. A. Wolf and R. JendCite this: Macromolecules 1979, 12, 4, 732–737Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue…
The reaction of Zircaloy in steam at elevated temperatures involves the growth of discrete layers of oxide and oxygen‐rich alpha Zircaloy from the parent beta phase. The multiphase, moving boundary diffusion problem thus described is encountered in a number of important reaction schemes in addition to that of Zircaloy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational dynamics of .alpha.,.beta.,.gamma.,.delta.-tetraarylporphyrins and their dicationsJennie Wang Dirks, George Underwood, Jolene Cox Matheson, and Devens GustCite this: J. Org. Chem. 1979, 44, 14, 2551–2555Publication Date (Print):July 1, 1979Publication History…
Abstract Phonon data are given for La 2 O 3 , Pr 2 O 3 , and Nd 2 O 3 single crystals. The polarized Raman spectra of Nd 2 O 3 are presented and analysed according to Pauling's structure: D 3d 3 (P 3 ml), Z = 1. A factor group analysis leads to the symmetries 2A 1g + 2 E g for the q = O lattice vibrations which give a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism for the Formation of Chloromethyl Branches in Poly(vinyl chloride)W. H. Starnes Jr., F. C. Schilling, K. B. Abbås, R. E. Cais, and F. A. BoveyCite this: Macromolecules 1979, 12, 4, 556–562Publication Date (Print):July 1, 1979Publication History Published online1 Ma…
On account of self-similarity of the Gaussian function under Fourier transformation, the lattice energy of the Gaussian core model at absolute-zero temperature exhibits duality relations. In the cases of one and two dimensions the duality involves high- and low-density pairs for the single stable lattice structure. In…
Alkaline earth fluoride crystals doped with trivalent rare earth contain both isolated and clustered rare earths. Electronic nonradiative relaxation for isolated rare earths proceeds solely by multiphonon relaxation while for clustered rare earths, it proceeds by both efficient nonresonant energy transfer and multipho…
The temperature dependence of cathodoluminescence intensity and decay time in the range 10°–480°K is reported for both nominally pure and Ce 3+ ‐doped yttrium aluminum garnet (YAG) crystals. Luminescence from characteristic lattice defect levels and from the 2 D excited state of the Ce 3+ impurity have both been inves…
The effects of radiation sterilization on ultrahigh molecular weight polyethylene were explored by freeze fractures, electron spin resonance, absorption of aqueous media, density measurements, small-angle and wide-angle x-ray scatter, differential scanning calorimetry, infrared and ultraviolet-visible spectrometry, st…
The presence of Fe(CN)6(-4) provides sequential, one-electron reduction pathways for OSO4. An equilibrium is established containing OSO4, Fe(CN)6(-4), Fe(CN)6(-3), OSO2(OH)4(-4), and labile cyano-bridged OS-Fe species containing Os in nominal oxidation states of VIII, VII, and VI. These osmium complexes are chelated b…
Arterial prostheses seeded with autogenous vascular endothelium demonstrate a well-organized, cellular, inner lining. To determine the nature of the lining cells, six animals underwent replacement of the infrarenal aorta with Dacron prostheses. During the preparation of three such grafts, endothelium was scraped from…