Materials Literature
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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…
The variation of electrical conductivity of MgO single crystals is measured as a function of temperature over the range from 300° to 1500°K. Heat pre-treatment is found necessary to stabilize the results at high temperatures. Assuming that the conductivity is electronic and intrinsic the energy gap between the full an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterconversion of Hexachlorocyclohexane IsomersR. R. Whetstone, F. C. Davis, and S. A. BallardCite this: J. Am. Chem. Soc. 1953, 75, 7, 1768–1769Publication Date (Print):April 1, 1953Publication History Published online1 May 2002Published inissue 1 April 1953https://doi.org…
Soil profiles examined in the parallel sand ridges between Ocean Beach and Woy Woy, N.S.W., show a progressive increase in podzolizatiun as one goes from the beach towards Woy Woy. There is reason to believe that the oldest ridges are about 4000 years old and it is thus possible to suggest a time scale for the leachin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of Film Formation of Latex PaintW. A. Henson, D. A. Taber, and E. B. BradfordCite this: Ind. Eng. Chem. 1953, 45, 4, 735–739Publication Date (Print):April 1, 1953Publication History Published online1 May 2002Published inissue 1 April 1953https://pubs.acs.org/doi/10…
Infrared spectra are presented for three crystalline phases of methyl ammonium chloride which occur at different temperatures. The spectrum of the high temperature structure reveals apparently degenerate vibrational frequencies for the perpendicular bands indicating little or no distortion from a threefold symmetry ax…
The paper discusses the relation of the relaxation time τ of a dielectric to the measured decay time of polarization T and proposes a new expression for the internal field in a dielectric subjected to an alternating field. It is found for this expression that 1<T/τ<32 and that in most instances no seriou…
A brief outline is given of the spin-wave approximation to the near ground states of ferromagnetism and antiferromagnetism. Simple pictorial models of spin waves are introduced. These models clarify the striking difference between ferromagnetic spin waves, which obey the dispersion law ω ∝ k2, and antiferromagnetic sp…
Summary In his recent theory of work hardening, Mott assumes that face-centred cubic crystals usually contain, prior to deformation, a network of dislocations, as suggested first by Frank; and he computes the decrease in the modulus of rigidity due to the existence of such a network. His computation may be extended to…