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The system MgO‐ZnO‐Sio 2 was studied by the quenching technique. No ternary compounds were found in the system, but extensive solid solution relations occurred in the magnesiumand zinc‐bearing compounds. Two ternary eutectics and one reaction point were located; the minimum melting point in the system was 1370°± 5°C a…
The index matching technique of Giordmaine and Maker has been extended to include the more general three-wave interaction. Two fundamentally different experimental arrangements may be considered; one has the two low frequency waves in parallel polarizations and the other has these waves in orthogonal polarizations. Th…
The frequency/wave-vector dispersion relation for normal modes of vibration propagating along the [00ζ], [ζζ0], and [ζζζ] directions in uranium dioxide at 296 °K has been determined by studying the coherent one-phonon scattering of slow neutrons from a single-crystal specimen. Analysis of the results shows that a simp…
The outer s- and p-electron overlap integrals involving ns, npσ, and npπ orbitals have been computed for all combinations of ion pairs in all of the alkali halide lattices. The free-ion closed-shell Hartree—Fock wavefunctions were used in all calculations. The halogen—alkali (H—M) overlaps are listed at the equilibriu…
Transformation of three commercial anatase powders resulted in sigmoid curves of transformation vs. time, which were interpreted in terms of a nucleation‐growth process. Analysis of these curves by several rate laws led to activation energies for nucleation of 109, 136, and 148 kcal/mole and for growth of 100, 115, an…
CONTENTS I. Methods of synthesising polyethyleneimine 516 II. Polymerisation of aziridine 516 III. Thermal decomposition of 2-oxooxazolidine 520 IV. Properties of polyethyleneimine 522 V. Reactions of polyethyleneimine 523 VI. Copolymers of aziridine 525
A series of carbon-14 measurements of 18th- and 19-century wood revealed an excellent correlation between the variations in carbon-14 content and average sunspot activity. It seems probable, therefore, that the predominant cause of the short-term fluctuations in carbon-14 activity is the variability of solar activity.
Abstract: A limited study of the compound U₃Si₂ has been made in reference to its use as a prospective nuclear fuel in sodium cooled reactors.
Abstract E.p.r. and endor spectra have been measured in ThO2 containing Tb4+. The crystalline electric field is cubic, and the splittings are very large compared with other S state ions. The values of the parameters in the standard cubic spin-Hamiltonian are: g = 2·0146 ±0·0004, 60B4 = —2527·53 ±0·10 Mc/s, 1260B6 = —2…
We show that the x-ray scattering from an electron gas in the large-momentum-transfer regime ($k\ensuremath{\gg}\frac{{P}_{F}}{\ensuremath{\hbar}}$) is a direct measure of the one-dimensional momentum distribution of the particles (including correlations). If the recoiling electron's momentum is measured in coincidenc…
The thermal conductivities of $\ensuremath{\beta}$-rhombohedral boron, orthorhombic (black) phosphorus, and orthorhombic sulfur have been measured down to 3\ifmmode^\circ\else\textdegree\fi{}K. These results, as well as some from the literature on cubic (white) phosphorus and on boron carbide, have been interpreted by…
Recent studies on x-ray and electron-excited luminescence (cathodoluminescence) in natural and synthetic diamond provide evidence that the previously reported band-$A$ luminescence is due to the radiative recombination across the indirect energy gap of electrons and holes separately trapped at donor and acceptor cente…
In previous papers we have formulated the theory of magnetostriction arising from single-ion crystal-field effects, for cubic crystals, and we have shown that the theory accounts extremely well for the temperature dependence of the magnetostriction in yttrium iron garnet. We here summarize that theory, extend it to ar…
Proton magnetic resonance spectra of a number of paramagnetic Ni II chelates of the type NiL1L2 where L1 and L2 are different aminotroponeimine ligands have been examined. The proton resonances show large hyperfine contact interaction shifts due to delocalization of spin density from the metal to the ligand by dπ—pπ b…
The correlation-function method is used to describe the dielectric relaxation behavior of liquids and directionally isotropic crystalline phases. The physical model used is that of a regular mixture of dipole molecules and vacancies on a lattice, i.e., the equivalent of the Bragg—Williams approximation. To calculate t…
A mass spectrometer has been used to study the kinetics of the oxygen—tungsten reaction over the temperature range 1400° to 3150°K at oxygen pressures as high as 2×10−4 Torr. The main products of chemical reaction are identified as W3O9, W2O6, WO3, and WO2; their intensities are given as a function of surface temperat…
The effective diagonal-exchange parameter ${J}_{\mathrm{eff}}(0)$ which determines the exchange splitting of a metal's Fermi-surface conduction electrons, has been investigated with a model involving simple orthogonalized-plane-wave conduction-electron orbitals and rare-earth ion cores. The positive exchange integral…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Oxygen and Nitrogen on Molecular Sieves.R. M. Thorogood, G. M. Wilson, and J. M. GeistCite this: J. Chem. Eng. Data 1965, 10, 3, 269–274Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMolten Sulfur as a Solvent in Infrared Spectrometry.T. K. Wiewiorowski, R. F. Matson, and C. T. HodgesCite this: Anal. Chem. 1965, 37, 8, 1080Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.acs.org/doi/…
Bowles, Jean A. (University of Colorado School of Medicine, Denver), and William Segal. Kinetics of utilization of organic compounds in the growth of Mycobacterium tuberculosis. J. Bacteriol. 90:157-163. 1965.-To obtain a workable system for a study of the kinetics of nutrient utilization (based on specific quantitati…