Materials Literature
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Wire grids have been fabricated with microscopic elements and periodicity. These wire grids behave as linear polarizers over large portions of the infrared spectrum, confirming predictions from electromagnetic theory. The method of fabrication of grids with periods as small as 463 mμ is described. Limits on the perfor…
Twin-domain walls in large crystals of antiferromagnetic NiO have been observed by specular reflection in optically polished and annealed crystals. These walls can be moved in annealed crystals by small mechanical stresses (<106 d/cm2) or by moderate magnetic fields (<25 000 oe) to yield completely untwi…
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Magnetic properties of single crystals of CrBr 3 have been measured with a magnetic balance and also with a torque magnetometer. The ferromagnetic Curie point has been found to be 37°K from the temperature dependences of magnetization and of torque. Based on the data of the magnetic susceptibility above the Curie poin…
The magnetic properties of single crystals of hausmannite (${\mathrm{Mn}}_{3}$${\mathrm{O}}_{4}$) have been investigated between 4.2\ifmmode^\circ\else\textdegree\fi{}K and the ferrimagnetic Curie point at 41.9\ifmmode^\circ\else\textdegree\fi{}K. The $c$ axis was found to be the hard direction of magnetization and th…
Enormous capture cross sections in the range ${10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ to ${10}^{\ensuremath{-}12}$ ${\mathrm{cm}}^{2}$ have been observed for a wide variety of Coulomb attractive centers in Si and Ge, some involving binding energies many times the Debye energy. Whereas multiphonon transitions to t…
The crystal structure of β-Ga2O3 has been determined from single-crystal three-dimensional x-ray diffraction data. The monoclinic crystal has cell dimensions a=12.23±0.02, b=3.04±0.01, c=5.80±0.01 A and β=103.7±0.3° as originally reported by Kohn, Katz, and Broder [Am. Mineral. 42, 398 (1957)]. There are 4 Ga2O3 in th…
Single crystals of uranium dioxide were deformed in compression at 700 to 1900 deg C. The most active slip plane at all temperatures was {100}, with {110} and {111} becoming more active as the temperature was increased. The slip direction for {100} slip was determined as. Fracture occurred on {111} planes with a singl…
The crystal structure of the R phase in the Mo-Co-Cr system, with atom ratio 30. 4-51.3-18.3, has been determined by single-crystal X-ray diffraction analysis. The crystal has space group C~i-R-3, with 53 atoms per rhombohedral cell. The rhombohedral lattice constants are a 0 = 9.011 /~, a = 74 27"5', hexagonal lattic…
Abstract The reaction mechanism of the ozone attack of SBR copolymers was studied to obtain information for use in the development of elastomeric materials having improved resistance to deterioration in service. Techniques of ultracentrifugation and viscometry were utilized to follow molecular changes induced by ozone…
This paper reports continued studies of the tensile properties of twisted continuous-filament viscose rayon, Tenasco, acetate, nylon and Terylene yarns, with particular reference to the influence of twisting tension, the differences between ring-twisted and uptwisted yarns, values of the work of rupture and the yarn c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical Rotatory Dispersion Studies on Polysaccharides. II. Conformation of Partially Methylated Cellulose in Solution1Brock NeelyCite this: J. Am. Chem. Soc. 1960, 82, 16, 4354–4357Publication Date (Print):August 1, 1960Publication History Published online1 May 2002Publishe…
The variables affecting corrosion and mass transfer of steels by inhibited liquid Bi are discussed and explained in terms of the variables affecting formation of the ZrN or ZrC inhibiting films. Corrosion is acclerated by increasing the maximum temperature of operation, the temperature differential, and the Cr content…
Abstract Fünf Präparate verschiedener Zusammensetzung innerhalb der homogenen Phase TiO wurden durch Sintern von TiO 2 ‐ und Ti‐Mischungen bei 1400° hergestellt, bei 1000° homogenisiert und dann von dieser Temperatur abgeschreckt. Gitterkonstantenmessungen ergaben für das TiO stöchiometrischer Zusammensetzung den Wert…
The thermal conductivity of eight halide crystals has been measured over the temperature range 220°K to 390°K. The thermal conductivities of potassium bromide, potassium chloride, and sodium chloride vary inversely with temperature for the lower part of this temperature range, and are nearly independent of temperature…