Materials Literature
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The magnetic structure of ${\mathrm{Fe}}_{4}$N has been examined in a neutron diffraction study. The results are in agreement with a model proposed by Wiener and Berger on the basis of magnetic measurements on a series of related compounds. Ferromagnetically aligned moments of 3 ${\mathrm{\ensuremath{\mu}}}_{\mathit{B…
The nuclear magnetic resonance spectrum of B11 has been investigated in several glassy materials containing boron oxide. A value of 2.76±0.05 Mc for the nuclear quadrupole coupling constant of B11 has been calculated from the second-order quadrupole perturbation of the m = ½→—½ resonance line. The same quadrupole inte…
The Hall coefficient and magnetoresistance in purified (99.995%) natural graphite single crystals have been measured from 25 to 25 000 gauss at 298\ifmmode^\circ\else\textdegree\fi{}, 77\ifmmode^\circ\else\textdegree\fi{}, and 4.2\ifmmode^\circ\else\textdegree\fi{}K with the field oriented parallel to the hexagonal ax…
Static fatigue of a simple soda-lime glass has been investigated in relation to the sensitivity of this glass to atmospheric corrosion. An analysis of the failure process has been given which is based on the concept that inherent surface flaws grow by corrosive mechanisms to critical dimensions by virtue of a reaction…
The sublimation of hexagonal SiC has been studied under equilibrium conditions. The predominant gaseous species above SiC are Si, SiC2, and Si2C. By combining the heat of formation of gaseous Si from solid SiC and the known standard heat of formation of SiC, a value of 113 kcal/g atom is obtained for the heat of subli…
The important metallurgical problems relevant to circulating fuel reactors utilizing fused fluoride systems are discussed. The successful utilization of such mixtures is in large measure dependent upon the development of reactor materials which can both contain the mixtures under reactor conditions and afford usefuly…
A study of the magnetic properties of single crystal samples of nickel-iron ferrite with composition ${\mathrm{Fe}}_{1.00}^{3+}$[${\mathrm{Ni}}_{0.79}^{2+}$${\mathrm{Fe}}_{0.36}^{2+}$ ${\mathrm{Fe}}_{0.90}^{3+}$]${\mathrm{O}}_{4}$ has revealed an abrupt transition in the magnetic anisotropy characteristics at 10\ifmmo…
The phase transition in BaTi${\mathrm{O}}_{3}$ at the Curie point was investigated on single crystals with optical and electrical techniques. Besides raising the cubic-tetragonal transition about 15\ifmmode^\circ\else\textdegree\fi{}C in the usual way with an electric field along the cube-edge direction, an orthorhomb…
Large photoconductive effects have been observed on single crystals of ZnO at 300\ifmmode^\circ\else\textdegree\fi{}K and 78\ifmmode^\circ\else\textdegree\fi{}K. At 300\ifmmode^\circ\else\textdegree\fi{}K the decay of the photoconductivity is strongly dependent on the ambient conditions, being slow in vacuum and fast…
Iodine sorption and moisture sorption data and some density, x-ray, and infrared data have been obtained on partially acetylated (PA) cottons before and after progres sice deacetylation with 2 N hydrochloric acid or with N 2 sodium hydroxide. The re sults substantiate the accepted theory that in the partial acetylatio…
Measurements are reported of the thermal conductivity of glassy selenium and polycrystalline metallic (hexagonal) selenium at temperatures from 2\ifmmode^\circ\else\textdegree\fi{} to above 100\ifmmode^\circ\else\textdegree\fi{}K. At the higher temperatures, the heat conductivity, $\ensuremath{\lambda}$, for the glass…
Pseudoternary System Calcium
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInhibition of Foaming. IX. Changes in the Rate of Attaining Surface Tension Equilibrium in Solutions of Surface-active Agents on Addition of Foam Inhibitors and Foam StabilizersSydney Ross and R. M. HaakCite this: J. Phys. Chem. 1958, 62, 10, 1260–1264Publication Date (Print…
Received 12 September 1958DOI:https://doi.org/10.1103/PhysRevLett.1.239©1958 American Physical Society
The effect of transition metal, alkali, alkaline‐earth, and heavy metal oxide additions on the sintering of magnesia was determined by measuring bulk density and shrinkage. Polished specimens were made on selected compositions and the grain structure was photographed. The unusual effect of titanium, zirconium, silicon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWetting of Polymer Surfaces. I. Contact Angles of Liquids on Starch, Amylose, Amylopectin, Cellulose and Polyvinyl AlcoholB. Roger Ray, J. R. Anderson, and J. J. ScholzCite this: J. Phys. Chem. 1958, 62, 10, 1220–1227Publication Date (Print):October 1, 1958Publication Histor…
Several theoretical analyses of the process of magnetization reversal in thin films by coherent rotation of the magnetization vector have been published. However, these analyses suffer from the use of questionable assumptions and from a lack of generality. This paper presents results obtained by employing an electroni…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Peroxide of 1,3-ButadieneC. T. Handy and H. S. RothrockCite this: J. Am. Chem. Soc. 1958, 80, 19, 5306–5308Publication Date (Print):October 1, 1958Publication History Published online1 May 2002Published inissue 1 October 1958https://pubs.acs.org/doi/10.1021/ja01552…
The internal structure of ordinary grey iron, pearlitic ductile iron, ferritic ductile iron, malleable iron and mild steel are compared. Differences in the amount of carbon present and in the form in which it occurs are responsible for some differences in the corrosion behavior of these materials. This is explained on…
It is little more than fifty years since the first manufacture of nitric acid by the oxidation of ammonia over a platinum catalyst. Ostwald’s original industrial plant had an output of some 100 tons of acid a year; today the world capacity for nitric acid manufacture by this process is about ten million tons a year. T…