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It is argued that there is a critical cation-anion covalent mixing parameter λc such that ligand-field theory is appropriate for λ<λc, but band theory must be used for λ>λc. This provides, therefore, a criterion for distinguishing metallic vs magnetic compounds in those structures, like perovskite, where…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Barium Ruthenium Oxide and Related CompoundsPaul C. Donohue, Lewis Katz, and Roland WardCite this: Inorg. Chem. 1965, 4, 3, 306–310Publication Date (Print):March 1, 1965Publication History Published online1 May 2002Published inissue 1 March 1965https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Scheme for Strain Energy Minimization. Application to the Cycloalkanes1Kenneth B. WibergCite this: J. Am. Chem. Soc. 1965, 87, 5, 1070–1078Publication Date (Print):March 1, 1965Publication History Published online1 May 2002Published inissue 1 March 1965https://pubs.acs.org…
A gas-filled bubble in a liquid will generally dissolve because of diffusion of gas out of the bubble into the surrounding liquid. However, when set into motion by an acoustic field, a bubble may grow by a process called rectified diffusion. This process can counteract the effect of diffusion for values of the acousti…
Fluorescence yields and lifetimes of solutions of europium and terbium salts in solution are greatly enhanced by using deuterated solvents. The magnitude of increase varies from an 18-fold enhancement in yield and lifetime for an aqueous solution of europium nitrate to a twofold enhancement for europium ethylenediamin…
A review of neutron diffraction studies of the magnetic properties of rare-earth metals and alloys is presented. For each of the pure metals Tb, Dy, Ho, Er, and Tm there is observed a transition at a temperature TN to an oscillatory antiferromagnetic configuration (helical or linear oscillator type). At lower temperat…
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Received 21 January 1965DOI:https://doi.org/10.1103/PhysRevLett.14.305©1965 American Physical Society
Hall-effect and electrical-conductivity measurements have been made on reduced single crystals of the perovskite potassium tantalate (KTa${\mathrm{O}}_{3}$) over the temperature range 1.6-295\ifmmode^\circ\else\textdegree\fi{}K. Lattice scattering predominates above 100\ifmmode^\circ\else\textdegree\fi{}K where the Ha…
The Curie point, lattice constants, sublattice magnetization, spontaneous magnetic moment, susceptibility, and the nonlinear susceptibility have been measured on the compounds RFeO3 with R yttrium or a rare earth. The main conclusions from these measurements are: (1) The rare-earth ions contribution to the magnetic pr…
This analysis provides the first precise crystal and molecular structural parameters for α-D-glucose. The C—C, C—H, and O—H bond lengths deviate only slightly from their means of 1.523 Å, 1.098 Å, and 0.968 Å. The C(1)—O(1) bond length, 1.389 Å, is significantly shorter than the mean value, 1.420 Å, of the other C—O b…
The silicones are in most cases relatively complex mixtures rather than pure molecular species. Their structures and chemical properties can be controlled, however, with sufficient reproducibility to give compositions with unique characteristics. The organic groups serve not only as a device for controlling the siloxa…
The mobility of substitutional boron in single crystals of graphite has been measured by an etch-decoration method, which makes it possible to locate individual boron atoms by electron microscopy. The mobility of boron is not very sensitive to the boron concentration, for B/C values between 10−2 and 10−8. The diffusio…