Materials Literature
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An improved atmosphere sintering process was developed for fabricating large transparent PLZT plates for electrooptic applications. Cold‐pressed 9/85/35 PLZT slugs were sintered in O 2 in Pt crucibles for ∼45 min at 1180°C and were then heat‐treated in air for 60 h at 1200°C in Al 2 O 3 crucibles containing PbZrO 3 at…
Spectral transmission losses of unclad optical fibers drawn from various types of commercial vitreous silica and of soda-lime-silicate glasses were measured in the wavelength range between 0.5 and 1.12 µm. The automated technique employed was both convenient to use and sensitive enough to measure losses of 6 dB/km, i.…
The pressure (0-21 kbar) and temperature [(4-300)\ifmmode^\circ\else\textdegree\fi{}K] dependence of the static dielectric properties of rubidium dihydrogen phosphate were investigated. Among the important results of these measurements are the large decrease in the transition temperature with pressure leading to the e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloporphyrin redox chemistry. Effect of extraplanar ligands on the site of oxidation in ruthenium porphyrinsGilbert M. Brown, Frederick R. Hopf, John A. Ferguson, Thomas J. Meyer, and David G. WhittenCite this: J. Am. Chem. Soc. 1973, 95, 18, 5939–5942Publication Date (P…
The short-range-order diffuse scattering from disordered Cu-Pd and Cu-Pt alloys has been studied by electron diffraction using thin foils prepared from bulk specimens. Twofold and fourfold splittings of diffuse scattering are observed at 100, 110 and equivalent positions in the composition ranges from about 13 to 60 a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon catalyzed racemization of 1,1'-binaphthylRichard E. Pincock, Wynona M. Johnson, Keith R. Wilson, and John. Haywood-FarmerCite this: J. Am. Chem. Soc. 1973, 95, 19, 6477–6478Publication Date (Print):September 1, 1973Publication History Published online1 May 2002Publish…
Some recent developments and problems in the field of microwave ferrites will be reviewed. Properties which are considered interesting will be presented and discussed for materials with new chemical formulas in the spinel and garnet diagrams. Then we shall give an example of the physico-chemical problems brought up by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVolume Changes of Mixing and Excess Coefficients of Thermal Expansion for Solutions of Polymethylene in n-DecaneRobert A. Orwoll and John A. SmallCite this: Macromolecules 1973, 6, 5, 755–757Publication Date (Print):September 1, 1973Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical conductivity of nickel oxide-magnesium oxide single crystalsJae Shi Choi, Hoo Young Lee, and Keu Hong KimCite this: J. Phys. Chem. 1973, 77, 20, 2430–2433Publication Date (Print):September 1, 1973Publication History Published online1 May 2002Published inissue 1 Se…
Abstract The influence of carbon black type on the dynamic properties of natural rubber is examined for nine carbon blacks, encompassing a wide range of structure and surface area. The dynamic properties are measured at 23° C and 100° C, over a 2 decade range of log frequency, and over a range of 1 to 25 per cent dyna…
The electrffication of growing ice crystals during condensation and evaporation was studied in ionized air of various small-ion concentrations. It was found that ice crystals were electrified positively during condensation and negatively during evaporation. Because of the difficulty of controlling humidity during evap…
In isopentane at 25° a 0.1 M solution of nortropane N-oxyl (1) contains 0.0618 M of the free radical and a 0.1 M solution of 9-azabicyclo[3.3.1]nonane N-oxyl (4) contains 0.0854 M of radical. Measurements at lower temperatures show that the thermodynamic parameters for the dimerization of these two nitroxides are very…
Abstract Mineralogical analyses of clays from two Alotenango soil horizons were made by utilizing transmission and scanning electron microscopy, infrared, X‐ray diffraction, and chemical methods. This report of spheroidal halloysite demonstrates the presence of this mineral form in an area of important volcanic ash‐de…
Available data on the range of electrons with energies less than 600 keV in air and other light materials are reviewed critically. It is shown that the practical (extrapolated) range R p (in g cm -2 ) can be related to the energy E(in keV) by using the following expressions: x=lgE;y=lgR p y=-6.160+2.585x-0.220x 2 (E>1…
Three previously considered relations for the dependence of the activation energy $\ensuremath{\Delta}$ on magnetic order, in "activated" EuO samples, are tested. These relations are: (i) $\ensuremath{\Delta}={\ensuremath{\Delta}}_{0}\ensuremath{-}(1+\ensuremath{\alpha}){\ensuremath{\delta}}_{R}$, where ${\ensuremath{…
Energy transfer between chromium and rare-earth ions in YAlO3 was investigated from fluorescence excitation spectra and fluorescence decay studies. Rare earths examined include Nd3+, Ho3+, Er3+, Tm3+, and Yb3+. Chromium—to—rare-earth transfer was observed in all cases; evidence of rare-earth—to—chromium transfer was a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral method for the determination of steric effects during collisional energy transfer. Partial photoresolution of penta-2,3-dieneCarmela S. Drucker, Vicente G. Toscano, and Richard G. WeissCite this: J. Am. Chem. Soc. 1973, 95, 19, 6482–6484Publication Date (Print):Septe…
The thermal conductivities ${K}_{\ensuremath{\perp}}$ and ${K}_{\ensuremath{\parallel}}$ in the $c$ plane and along the $c$ axis, respectively, have been measured in Fe${\mathrm{Cl}}_{2}$ between 1.2 and 80 \ifmmode^\circ\else\textdegree\fi{}K. Both ${K}_{\ensuremath{\perp}}$ and ${K}_{\ensuremath{\parallel}}$ are fou…
With the aid of 1,045 new analyses for magnesium in echinoid and asteroid skeletal calcite, the geological significance of the well-known relationship between magnesium content and water temperature has been reexamined. Remarkably large, but systematic, variations in skeletal chemistry indicate that physiological fact…
Abstract The reflectance spectra of bulk samples of the germanium telluride (GeTe) system have been measured in the wavelength range 13 to 0.2 μm. The principal optical constants of the system have been obtained by inverting the spectra using the Kramers‐Kronig technique. Two distinct types of behavior were encountere…