Materials Literature
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Raman data have been obtained for vitreous and molten B2O3 from −196 to 1594 °C. A ΔH° of 6.4±0.4 kcal/mole boroxol was obtained from the temperature dependence of ratios of integrated Raman intensities. This heat is thought to correspond to the transformation of BO3 triangles in boroxol rings, to BO3 triangles in a r…
The electrostrictive strains induced by high electric fields have been measured for compositions in the solid solution system Pb(Mg1/3Nb2/3)O3: PbTiO3 (PMN:PT) containing up to 20 mole% PT. Large anhysteretic quadratic strains (up to 1,000 × 10−6) can be induced at room temperature with no evidence of remanence. In pu…
Calcite precipitation occurs when trimethylamino‐N‐oxide and medium are added to surface waters collected above Lodestone and Keeper Reefs of the Great Barrier Reef. The calcium content of the water was initially 430 ppm. After 30 days incubation at 28 °C, the pH had risen and only 90 ppm of calcium remained in soluti…
Cavity (void) formation and swelling in non-fissile materials during neutron irradiation and charged particle bombardments are reviewed. Helium is the most important inert gas and is primarily active as a cavity nucleant. It also enhances formation of dislocation structure. Preimplantation of helium overstimulates cav…
Abstract
The ferroelectric properties of (Na0,5Bi0,5TiO3) single crystals are studied. It is found that some physical characteristics possess a large temperature hysteresis in the temperature range 200 – 300°C. The nature of that hysteresis is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of Segmented Polyether Poly(urethaneureas) Based of 2,4-Toluene Diisocyanate. 2. Infrared and Mechanical StudiesC. S. Paik Sung, T. W. Smith, and N. H. SungCite this: Macromolecules 1980, 13, 1, 117–121Publication Date (Print):January 1, 1980Publication History Pu…
The phase diagram of the Bi2O3-Er2O3 system was investigated. A monophasic f c c structure was stabilized for samples containing 17.5–45.5 mol% Er2O3. Above and below this concentration range polyphasic regions appear. The f c c phase showed high oxygen ion conduction. The ionic transference number is equal to one for…
The crystal structure of the title compounds [Cu(tren)(NH3)][ClO4]2(1) and K[Cu(NH3)5][PF6]3(2) have been determined by X-ray diffraction methods using three-dimensional diffractometer data; the structures were solved by heavy-atom techniques and successive Fourier synthesis. Compound (1) crystallises in a cubic unit…
Abstract The influence of water content on the gelatinization of wheat starch was examined by differential scanning calorimetry. Three endothermic transitions were observed when starch was heated to 140 °C with 35 to 80% (w/w) water. The temperature of the second and third endotherms and the enthalpies of the first an…
The magnetic properties of the tetrameric oxygen-bridged copper (II) complexes [{CuX(OCH2CH2NR2)}4](1)(R = Me, X = NCO; R =Prn, X = NCO; and R = Bun, X = NCO or NCS) have been determined in the temperature range 3.4–300 K. The cubane-type complexes exhibit magnetic interactions between the single copper (II) ions, whi…
Thin films of the ‘metallic’ polymer, polypyrrrole, when adhered to a platinum electrode surface, can be repeatedly driven between the conducting and insulating state with E°′ near –220 mV vs. the sodium chloride calomel electrode.
A 2D band structure model is proposed to describe electronic states in the lowest stages (n = 1, 2) of GAC. The tight binding method is applied taking into account intra and interlayer nearest neighbour interactions. From the energies and wavefunctions of the π valence and conduction bands, the frequency dependence of…
A quantitative procedure for indirectly locating hydride ligands bound to transition metals in cluster compounds is described. The method predicts hydride positions which can be and are compared with those determined by neutron (and X-ray) diffraction. Examples are presented of its use in determining hydride sites in…
Determination of Structure-Property Relationships in Polymers. Probability Applied to Polymerization. Theory of the Characterization of Polymer Microstructure. Multicomponent Copolymerization Theory. Copolymer Microstructure and Its Experimental Treatment. Chemical and Physical Methods of Determining Polymer Microstru…
Abstract After defining Fickian diffusion in rubbery polymers an overview of transport behavior in polymers is presented. Diffusion and sorption below the glass transition are discussed, followed by a review and classification of the various theoretical models which have been proposed to account for these phenomena. A…
A method, called "protein blotting," for the detection of DNA-binding proteins is described. Proteins are separated on an SDA-polyacrylamide gel. The gel is sandwiched between 2 nitrocellulose filters and the proteins allowed to diffuse out of the gel and onto the filters. The proteins are tightly bound to each filter…
In many biological materials radiation damage limits the resolution of the microanalytical measurement. To provide some perspective regarding the relative merits of different experimental arrangements, the dose to the specimen may be calculated using a simple model. While electron and proton probe X-ray microanalysis…
The Hall coefficient and resistivity of the first-row transition-metal intercalates, M1/3TaS2 (M = V, Cr, Mn, Fe, Co, Ni), Mnl/4TaS2, M1/3NbS2 (M = V, Cr) and Fel/4NbSe2 have been measured as a function of temperature. These intercalation complexes show either ferromagnetic or antiferromagnetic orderings and there are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry, structure, and physical properties of niobium disulfideWayne G. Fisher and M. J. SienkoCite this: Inorg. Chem. 1980, 19, 1, 39–43Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://pubs.…