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The crystal structure of tetragonal tellurium dioxide was studied using neutron diffraction. The space group is either P 4 1 2 1 2 or P 4 3 2 1 2. The lattice constants are: a = 4.796 Å, c = 7.626 Å, c / a = 1.59. New oxygen-atom parameters were determined. The coordination polyhedron of the tellurium atom is a distor…
The relations between the structure, crystal chemistry, chemical bonds involved, and the infrared spectra of layer‐structure silicates established on the basis of recent experiments are discussed and summarized.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Calculation of Electrochemical Kinetic Parameters from Polarographic Current-Potential CurvesLouis Meites and Yecheskel IsraelCite this: J. Am. Chem. Soc. 1961, 83, 24, 4903–4906Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Publis…
A mathematical treatment of steady-state dendritic growth from pure and alloy liquids has been developed for isothermal and nonisothermal dendrites. The velocity of dendritic growth, dendrite size, dendrite direction, and the alloy content of the dendrite have been calculated as a function of the bath supercooling, th…
Research Article| December 01 1961 Sexual Cycles of Three Green Algae for Laboratory Study Robert W. Hoshaw Robert W. Hoshaw Search for other works by this author on: This Site PubMed Google Scholar The American Biology Teacher (1961) 23 (8): 489–499. https://doi.org/10.2307/4439731 Views Icon Views Article contents F…
The potassium salt of o -nitrophenol crystallizes in space group C 2/ c with 8 molecules of C 6 H 4 · NO 2 · OK · ½ H 2 O in the unit cell of dimensions a = 24.73 Å, b = 5.21 Å, c = 11.96 Å and β = 105.15°. The structure has been solved by the heavy-atom method and has been refined by Fourier and least-squares synthes…
The theory of spherical probes based on the impact parameter of the carriers is given. Fields outside the sheath are neglected, which is justified for electron collection. The results are obtained more directly than by Mott-Smith and Langmuir. General results such as the transition from impact parameter limitation to…
Abstract A rigorous method was developed to account for nonuniform temperature distributions in the analysis of kinetic data. The rate constants cannot be determined directly since they are functions of temperature, so equations were derived and solutions developed for the substantially temperature independent kinetic…
Fluorescence radiation from polycrystalline La: PrCl/sub 3/ was observed using two separate excitation sources. This fluorescence cannot be attributed to either source alone. The scheme is similar to N. Blocmbergen's proposal for a solid-state infrared quantum counter (Phys. Rev. Letters Porter, Jr., J. Appl. Phys. 32…
The dielectric constant of NaNO 2 crystal was measured in a temperature range from r.t. to 200°C and in a frequency range from 60 to 10 6 cycles per second. It shows peak at 164.2°C in heating and at 162.6°C in cooling. Dielectric dispersion, similar to the one observed in other ferroelectrics, exists in all direction…
An extensive investigation is presented on the role of direct exchange as the mechanism responsible for ferromagnetism. The direct exchange integral $J$ which arises in Heisenberg's theory of ferromagnetism and which has been a subject of considerable speculation and controversy (particularly concerning its sign behav…
A study has been made of the toxicology and pharmacology of gadolinium and samarium chlorides. The symptoms of acute toxicity following intraperitoneal injection are described. The chronic oral ingestion of both chemicals for 12 weeks produced no effects on growth or the blood picture, and only the male rats receiving…
Pyrolytic graphite is a vapor‐deposited form of carbon which is characterized by strong anisotropic properties. The anisotropy is caused by the tendency of the individual crystallites to align themselves in such a way that their c axes are perpendicular to the surface of deposition. The Individual crystallites are com…
An examination of the conditions under which the normalized coherence function γ(x1,x2,τ), at two points x1 and x2 in an optical field, is reducible to the product of a function of x1, x2 and a function of τ leads to the concept of cross spectral purity. Spectrally pure beams of light are characterized by the property…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the Chromium(VI) Oxide-Pyridine ComplexJOHN R. HOLUMCite this: J. Org. Chem. 1961, 26, 12, 4814–4816Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Published inissue 1 December 1961https://pubs.acs.org/doi/10.1021/jo01070a009ht…
The effects of anharmonic vibrations on the molecular intensity function M (s) of electron diffraction and on the radial distribution function f(r) considered in paper I, are treated more rigorously to meet current needs. More definitive general relations for interpreting experimental diffraction data in terms of mole…
The boron flame bands have been observed in absorption during the flash photolysis of mixtures of boron trichloride and oxygen. Detailed analysis of the spectrum has shown that the bands arise from two electronic transitions in the linear symmetric molecule BO 2 , [Formula: see text] and A 2 Π u −X 2 Π g . The main mo…
The complete-matrix least-squares analysis on the neutron diffraction intensities of CaC2, YC2, LaC2, CeC2, TbC2, YbC2, LuC2, and UC2 yielded the C–C distances in the C2 groups, 1.191±0.009, 1.275±0.002, 1.303±0.012, 1.283±0.004, 1.293±0.009, 1.287±0.010, 1.276±0.012, and 1.340±0.007 A, respectively. The statistical a…
sections for electron microscopy has become the accepted practice in recent years. Salts of metals of high atomic weight such as uranium, chromium, thorium, lead, or tungsten, among many tested, have been found suitable (6, 1). "Lead hydroxide," as preparted by Watson (6), is now widely used, hut thi…
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