Materials Literature
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The compounds Mg2TiO4, MgTiO3, MgTi2O5, CaTiO3, SrTiO3, and BaTiO3 were prepared in crystalline form by reactions in the solid state. The rod-shaped samples were sintered in oxygen at 1450°C and reduced in hydrogen at temperatures from 560°C to 1400°C producing n type semiconductors. Resistivity values from 10−1 to 10…
It is well known that evaporated aluminum films develop a diffuse reflecting surface as their thickness increases, but it is not generally appreciated that the limiting thickness at which light scattering appears decreases as the incidence angle of the vapor atoms arriving at the condensing surface increases. Aluminum…
The reflection method provides means of studying the 10‐micron infrared region that contains the fundamental vibration of the silica lattice. Structural changes produced by introduction of various amounts of alkali or alkaline‐earth network modifiers can be conveniently followed. A series of soda‐silica glasses was st…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text B. A. Lippmann, "Note on the Theory of Gratings*," J. Opt. Soc. Am. 43, 408-408 (1953) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical Properties of Organosilicon Compounds. I. Hexamethylcyclotrisiloxane and OctamethylcyclotetrasiloxaneRobert C. Osthoff, W. T. Grubb, and Charles A. BurkhardCite this: J. Am. Chem. Soc. 1953, 75, 9, 2227–2229Publication Date (Print):May 1, 1953Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPower Requirements of Melt ExtrudersR. S. Mallouk and J. M. McKelveyCite this: Ind. Eng. Chem. 1953, 45, 5, 987–989Publication Date (Print):May 1, 1953Publication History Published online1 May 2002Published inissue 1 May 1953https://pubs.acs.org/doi/10.1021/ie50521a035https:…
Phase equilibrium studies at subsolidus temperatures, made in the presence of an aqueous phase at high pressures, are briefly reviewed for the systems eucryptite–silica, Al 2 O 3 –Ga 2 O 3 , MgAl 2 O 4 –Al 2 O 3 , and TiO 2 . Low‐temperature equilibrium relations have been largely clarified for the first three systems…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Quantitative X-Ray Analysis by Diffraction-Absorption TechniqueJean LeRoux, D. H. Lennox, and Kingsley KayCite this: Anal. Chem. 1953, 25, 5, 740–743Publication Date (Print):May 1, 1953Publication History Published online1 May 2002Published inissue 1 May 1953https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PREPARATION OF SAMARIUM AND YTTERBIUM METALS1A. H. Daane, D. H. Dennison, and F. H. SpeddingCite this: J. Am. Chem. Soc. 1953, 75, 9, 2272–2273Publication Date (Print):May 1, 1953Publication History Published online1 May 2002Published inissue 1 May 1953https://pubs.acs.o…
Specific heat data on diamond at temperatures between 20° and 300°K are reported. Comparisons of the data have been made with the predictions of the Debye theory. The deviation of the specific heat from the value given by the three-dimensional continuum theory in the low temperature region can be qualitatively describ…
When a specially designed field cathode assembly was inserted in a commercial electron microscope which was appropriately modified for the purpose, the geometry of the needle shaped emitter was obtained from micrographs of several of its profiles at various stages of emitter fabrication and experimental use. An invest…
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The term ``sensitized luminescence'' in crystalline phosphors refers to the phenomenon whereby an impurity (activator, or emitter) is enabled to luminesce upon the absorption of light in a different type of center (sensitizer, or absorber) and upon the subsequent radiationless transfer of energy from the sensitizer to…
The electrical conductivities along the principal directions of graphite crystals have been measured using a large number of well-developed single crystals obtained from Ceylon. The conductivity along a direction perpendicular to the hexagonal axis is about ${10}^{4}$ times that along the axis. Rectification and other…
It has been verified by means of the polarization microscope that rochelle salt in the ferroelectric state consists of many domains. The domain structure in an annealed crystal is caused by the electrostatic self energy. When the electric field along the $X$ direction is increased and then decreased gradually, success…
Calculations are given for the frequency moments associated with the dipolar broadening of magnetic resonance lines in crystals having lattice points populated at random by identical paramagnetic ions or nuclei. It is found that for fractional magnetic population $f>0.1$ the line shape is approximately Gaussian wit…
Abstract Theories of Raman intensities are reviewed, and it is shown that no satisfactory theory exists which enables relative intensities to be predicted. A matrix method for calculating the derived invariants of the molecular polarizability in terms of polarizability functions characteristic of bonds and general coe…