Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance studies of cation orientation in restricted water layers on phyllosilicate (smectite) surfacesMurray B. McBride, T. J. Pinnavala, and M. M. MortlandCite this: J. Phys. Chem. 1975, 79, 22, 2430–2435Publication Date (Print):October 1, 1975Publication Hi…
Chemical processes occurring in the vapor deposition of silicon from and in the etching of silicon by were studied by means of a mass spectrometer coupled to the CVD reactor. This setup was successfully used for the qualitative and quantitative analysis of the composition of the vapor phase in the Si‐Cl‐H system. Spec…
The incorporation of lattice dislocations into high-angle grain boundaries either with small radii of curvature or absorbing lattice defects is observed by the in situ heating of thin foils in a transmission electron microscope. At a given temperature, the rate of incorporation is higher than for equilibrium boundarie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall anion binding to cycloamylose. Equilibrium constantsJ. F. Wojcik and R. P. RohrbachCite this: J. Phys. Chem. 1975, 79, 21, 2251–2253Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 October 1975https://pubs.acs.or…
The high intensity x-ray flux from the synchrotron radiation at the Stanford Synchroton Radiation Project has been used to study the extended x-ray absorption fine structure (EXAFS) of the iron-sulfur protein Peptococcus aerogenes rubredoxin. Absorption measurements were made from 7080 eV, which is below the K-edge of…
Interdiffusion in the Ti/Pd/Au thin-film system is measured using Rutherford backscattering. Interdiffusion rates of Pd/Au for temperatures between 200 and 490 °C have been correlated with the defect structure of the films using models of defect enhanced diffusion. Au diffusing in Pd has been analyzed by the Whipple m…
A comparison is presented of the results of intergranular (IG) corrosion testing by the standard method (ASTM A 262, Practice E) and by an electrochemical reactivation method. Five Cr-Ni and Cr-Ni-Mo steels containing 0.025 to 0.09% C were tested. Discrepancies between the classical and the electrochemical test are ac…
In order to obtain information concerning the effect of molecular weight on the molecular mobility involved in the relaxation processes associated with the nonequilibrium thermodynamic state of glassy polymers, enthalpy-relaxation studies have been undertaken on glassy atactic polystyrenes of various molecular weights…
Measurements of the pressure and temperature dependences of the soft-mode Raman spectra of potassium dihydrogen phosphate (KDP) in both the paraelectric (PE) and ferroelectric (FE) phases are reported. The soft-mode response is overdamped throughout the PE phase at atmospheric pressure, but can be made underdamped wit…
Abstract The dielectric functions ϵ | arid ϵ ⟂ of graphite were redetermined by electron energy loss spectroscopy. At 11 eV a strong maximum in Im (ϵ | )is obtained, which is in accordance with earlier electron energy loss experiments, but in disagreement with recent reflectance measurements. A detailed discussion of…
Abstract The luminescence lifetimes in K2Pt(CN)4·3H2O, BaPt(CN)4·4H2O and MgPt(CN)4·7H2O were measured at 1 atom. and higher hydrostatic pressures up to 7.2 kbar at room temperature. Two longer components lengthen anomalously by a factor of ∼ 30 with a decrease in the Pt–Pt distance from 3.50 to 3.16 Å.
Abstract Poly(1,3,4‐oxadiazole‐2,5‐diyl‐1,2‐ethendiyl) and poly(1,4‐phenylene‐1,3,4‐oxadiazole‐2,5 diyl‐1,2‐ethenediyl) have been prepared by condensation polymerization using fuming sulfuric acid and different quantities of terephthalic acid (T), fumaric acid (F), and hydrazine sulfate (HS). Homopolymers of F and T a…
SrSiO 3 occurs in two distinct modifications, shown by selected-area electron diffraction to be polytypes. The thermodynamically more stable form, SrSiO 3 (30 Å), has a geometrically near-rhombohedral unit cell, with a = 7.16, c = 30.36 Å on the pseudohexagonal axes, and is an analogue of SrGeO 3 . The other polytype,…
Abstract The crystal structure of sodium hexahydroxoantimonate (V), NaSb(OH)6, has been refined. The previous structure given by Schrewelius was confirmed, but the positional parameters of oxygen atoms were shifted significantly. Both antimony and sodium atoms are surrounded by six oxygen atoms octahedrally. The inter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonexponential luminescence decay in hexaureachromium(III)Francesco Castelli and Leslie S. ForsterCite this: J. Am. Chem. Soc. 1975, 97, 22, 6306–6309Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 October 1975https:/…
A detailed semiempirical molecular orbital calculation is presented for computing the energy levels of various luminescent centers in the antimonates. In order to interpret the excitation spectrum of the nondoped compounds, the MO calculations are carried out on two clusters: (SbO6)7− and (SbO6)9−. In the first one, t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-melting nematic phenyl 4-benzoyloxybenzoate liquid crystalsJ. P. Van Meter and A. K. SeidelCite this: J. Org. Chem. 1975, 40, 20, 2998–3000Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 October 1975https://pubs.a…
In many of their compounds the transition metals have covalence 9, forming nine bonds with use of nine hybrid spd bond orbitals. A set of maximum-valence single-bond radii is formulated for use in these compounds. These radii are in reasonably good agreement with observed bond lengths. Quadruple bonds between two tran…
Abstract Full and reduced charge smectite saturated with Na(I), Ca(II), Cu(II), or tetralkylammonium ions were swollen by a series of solvents of various bulk physical properties. In the full charge smectites, swelling occurred in all solvents regardless of the exchange ion or the initial water content. Charge differe…
The electric field induced second harmonic coefficient has been measured in glass. We have concluded that the nuclear contribution is significantly smaller than the electronic contribution, and that this third order effect in glass cannot be neglected when measuring the molecular hyperpolarizabilities of most organic…