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It has recently been observed that cristobalite can hetero‐geneously nucleate and grow internally in vitreous silica. When the glass‐crystal composite is cooled to room temperature, β‐cristobalite is metastably retained as a result of the large tensile stresses developed during cooling. Although these crystals are not…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of new high-pressure pyrochlore phasesR. D. Shannon and A. W. SleightCite this: Inorg. Chem. 1968, 7, 8, 1649–1651Publication Date (Print):August 1, 1968Publication History Published online1 May 2002Published inissue 1 August 1968https://pubs.acs.org/doi/10.1021/ic…
Abstract The absorption of biologically important purines, pyrimidines, and nucleosides by Li-, Na-, Mg-, and Ca-montmorillonite has been studied in aqueous solutions over a range of pH values 2–12. The initial organic concentrations were about 1 m.molar. The ratio clay to organic compounds was such that only up to 25…
High temperature gas reaction specimen chamber for an electron microscope has been constructed. The specimen under electron microscopic observation can be heated at about 1000°C in a gas layer at a pressure of about 300 Torr. The specimen is placed on a film covering the minute hole in the platinum ribbon and heated b…
Abstract Dielectric properties of four methacrylate polymers (methyl, ethyl, n ‐butyl and n ‐octyl) were studied in the frequency range 0.0001 cps–300 kcps at temperatures above and below the glass transition temperature and at various pressures up to 2500 atm. At temperatures well above T g a single relaxation peak (…
Abstract The mechanism of boron uptake by clays, especially illitic clays, and the factors which control such uptake have long been debated issues. In an attempt to answer some of the questions of the controversy, three illites were treated in solutions containing boron. In the study, boron concentration, salinity, te…
THE VIEW THAT THE PLANT CELL GROWS BY THE YIELDING OF THE CELL WALL TO TURGOR PRESSURE CAN BE EXPRESSED IN THE EQUATION: rate = cell extensibility x turgor. All growth rate responses can in principle be resolved into changes in the 2 latter variables. Extensibility will relate primarily to the yielding properties of t…
A new electro-optic effect is presented, based on guest-host interactions in nematic liquid crystals. The ability of a nematic liquid crystal to cooperatively align in an electric field is used to orient ``guest'' dichroic dye molecules (molecules whose absorption spectrum is a function of the molecular orientation wi…
A new allotropic form of carbon occurs in shock-fused graphite gneisses in the Ries Crater, Bavaria. The assemblage in which it occurs consists of hexagonal graphite, rutile, pseudobrookite, magnetite, nickeliferous pyrrhotite, and baddeleyite. Electron-probe analyses indicate that the new phase is pure carbon. It is…
A fourteen-faced space-filling polyhedron which closely approximates the actual distribution of four-, five- and six-sided polygons found in packings of soap bubbles and biological cells is proposed as an alternative to the Kelvin tetrakaidecahedron as the ideal polyhedron for these packings. This polyhedron may also…
The photoluminescence spectrum of gel-grown P${\mathrm{bI}}_{2}$ single crystals reveals features at 2.41, 2.31, 2.16, 2.13, 2.10, 1.99, 1.97, 1.94, and 1.85 eV, and the photoconductive response spectrum at 3.06, 2.41, 2.16, and 1.99 eV. An analysis of temperature quenching of the photocurrent indicates sensitizing ce…
The infrared spectra of matrix isolated CsOH and CsOD have been observed. Both the CsO stretching and the bending mode have been assigned for each species. The Cs–O stretching mode ν2 is observed at 335.6 and 330.5 cm−1 for CsOH and CsOD, respectively; the bending mode ν2 is observed at 306 and 226 cm−1, respectively.…
Phosphorescence spectra of pure crystalline naphthalene at room temperature and at 77°K are presented. In addition to the 0, 0 transition at 4715 Å, the spectra show several intense vibronic bands that correlate well with the most intense vibronic transitions observed in isotopic mixed-crystal phosphorescence spectra…
The thermoelectric power of dilute alloys of aluminum with Ag, Zn, Mg, and Au has been measured versus pure aluminum between 4.2 and 460\ifmmode^\circ\else\textdegree\fi{}K. The solute concentrations were in general 0.1 at.% or smaller. The absolute thermopower of high-purity Al has been measured between 4.2 and 300\i…
Evidence for molecular association of liquid TiCl4 is presented. The chlorine isotope structure in the totally symmetric fundamental cannot have originated from a simple tetrahedral molecule belonging to the Td point group. High-resolution measurements, which indicate an associated complex of lower symmetry, possibly…
The two principal components of the mean square atomic displacement differences due to thermal vibrations in zinc have been measured from single-crystal x-ray diffraction intensities over a thermal range from 4.85 to 600\ifmmode^\circ\else\textdegree\fi{}K. The absolute value of the components of the mean square atomi…
The optical functions ${\ensuremath{\epsilon}}_{1}$, ${\ensuremath{\epsilon}}_{2}$, $\ensuremath{\alpha}$, and $\ensuremath{-}\mathrm{Im}(\frac{1}{\ensuremath{\epsilon}})$ have been deduced from reflectance data on electron-gun-evaporated Pt samples. They were obtained by two different methods: (1) the Kramers-Kroning…
The effect of strain, in particular the effect of varying the rate of its application, both in the elastic and the plastic region, on the anodic dissolution kinetics of several metals has been studied. It has been found in the case of iron in acid solution that the over-all effect of elastic strain is small (i.e., the…
Structure has been observed in the photoconductivity spectrum of semiconducting diamond at energies below the ionization threshold. Photoconductivity maxima in this spectral region have been found to coincide exactly with maxima in the absorption spectrum associated with transitions to excited states of the aluminum a…
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