Materials Literature
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The chemical equilibrium for the system ZrO 2 ‐CaO was rede termined for temperatures above ∼1000°C by heating reactive powders for extended periods of time. The eutectoid decom position of the cubic solid solution was found to occur at 1140°±40°C and 17.0±0.5 mol% CaO. Decomposition reac tions in sintered cubic solid…
Highly conducting p-type diamond layers have been obtained by high-dose boron implantation followed by annealing (1400 °C) and subsequent removal of the graphite-like layer that is formed as a result of the heat treatment. Conductivity and Hall measurements showed transport features typical of heavily doped semiconduc…
It is shown that when the observed and calculated intensities in a powder diffraction pattern differ because of model errors which affect the calculated integrated intensities, in addition to the random counting errors, Rietveld refinement with weights determined solely by counting statistics yields estimated standard…
Dense samples of several compositions in the system SiC‐AIN were fabricated by hot‐pressing. The SiC‐AIN powder was prepared by carbothermal reduction of an intimate mixture of alumina, silica, and carbon in a nitrogen atmosphere. X‐ray diffraction and electron and optical microscopy were used to determine the chemica…
A radioenzymatic assay for measurement of pyridoxal 5'-phosphate (PLP) is described, based on the incubation of L-[3H]tyrosine (10(6) cpm, spec. acty. 1.88 Ci/mol) in the presence of the apoenzyme tyrosine decarboxylase (EC 4.1.1.25) from Streptococcus faecalis and PLP in phosphate buffer (0.1 mol/L, pH 5.5) at 37 deg…
Abstract Two kinds of ultrahigh‐molecular‐weight linear polyethylene (UHMW PE), together with conventional high‐density polyethylene (HDPE), were subjected to β irradiation, and changes in their properties were monitored. Elastic modulus increased steadily with dose for all materials, as did the yield stress. A dramat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopy of colloidal metal systems: a two-dimensional phase equilibrium in p-aminobenzoic acid adsorbed on silverJ. S. Suh, D. P. DiLella, and M. MoskovitsCite this: J. Phys. Chem. 1983, 87, 9, 1540–1544Publication Date (Print):April 1, 1983Public…
The presence of a PbO‐rich liquid phase was previously shown to affect the densification of lead zirconate‐lead titanate (PZT) ceramics. The present work attempts to quantify the role of this liquid phase. Increasing amounts of PbO‐rich liquid phase is shown to increase the rates of densification in the initial and in…
The kinetics of devitrification in ZrF 4 ‐BaF 2 ‐LaF 3 (62–33–5 mol % ) glass were studied by isothermal and nonisothermal methods using differential scanning calorimetry. The crystallization reaction followed the Avrami equation, x =1‐exp[—( kt) ], where x is the fraction crystallized after time t . The rate con stan…
We have used photoemission techniques with synchrotron radiation to study the adsorption of oxygen on the Si(111)-(7×7) and Si(100)-(2×1) surfaces at room temperature in the submonolayer and monolayer regimes. High resolution Si 2p core-level spectra, valence-band spectra, work-function, and Fermi-level pinning positi…
Abstract With a view of developing latent heat storage materials, mixtures of pseudo-binary system, CH3CO2Na·3H2O–CO(NH2)2 (sodium acetate trihydrate–urea) were subjected to differentital scanning calorimetry, and the partial phase diagram for ternary system CH3CO2Na–CO(NH2)2–H2O at ambient pressure was constructed. T…
The 84% Zr–16% Al nonevaporable getter alloy has been used for a long time in vacuum technology and, more recently, has been adopted in advanced applications such as fusion technology and particle accelerators. A new getter material consisting of a Zr–V–Fe ternary alloy having interesting characteristics for these app…
The oxidation of zinc in air at 294 K has been studied for exposure times from 1 min to 150 h. The fraction of zinc in the Zn+2 valence state has been determined by high resolution Auger electron spectroscopy. Surface oxide thickness was measured by using AES with argon ion sputter etching. The adsorbed oxygen was sho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation by small-angle neutron scattering of the chain conformation in equilibrium-swollen poly(dimethylsiloxane) networksMichel Beltzung, Jean Herz, and Claude PicotCite this: Macromolecules 1983, 16, 4, 580–584Publication Date (Print):April 1, 1983Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential scanning calorimetry characterization of polypropylene. Dependence of Tg on polymer tacticity and molecular weightDavid R. Burfield and Yoshiharu DoiCite this: Macromolecules 1983, 16, 4, 702–704Publication Date (Print):April 1, 1983Publication History Published…
Oxygen does not quench the luminescence of either free Tb or of Tb bound to dipicolinate. However, sensitized Tb luminescence in complexes of that ion with elastase, thermolysin, and alpha-amylase is quenched by oxygen at rates that far exceed that with which the intrinsic fluorescence of the proteins is quenched. We…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrowave structure measurements on the furan-argon complexStephen G. KukolichCite this: J. Am. Chem. Soc. 1983, 105, 8, 2207–2210Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1 April 1983https://pubs.acs.org/doi/10.102…
The lattice-dynamical properties of tetragonal (black) SnO (with space-group symmetry $\frac{P4}{\mathrm{nmm}}$) have been examined over the temperature range $78\ensuremath{\le}T\ensuremath{\le}300$ K by variable-temperature $^{119}\mathrm{Sn}$ M\"ossbauer-effect measurements. The lattice temperature calculated from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical characterization of p-type semiconducting tungsten disulfide photocathodes: efficient photoreduction processes at semiconductor/liquid electrolyte interfacesJoseph A. Baglio, Gary S. Calabrese, D. Jed Harrison, Emil Kamieniecki, Antonio J. Ricco, Mark S. Wrig…
The Fourier and variance methods are used to analyse the breadths of X-ray diffraction peaks from ZnO powder obtained from the thermal decomposition of Zn 3 (OH) 4 (NO 3 ) 2 . The shape, size, distribution of size and orientation of the crystallites are determined. It is found that the form is markedly anisotropic and…