Materials Literature
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A new technique has been developed by which naturally and anodically formed aluminum oxide produced on single-crystal specimens has been studied in the electron microscope. The low-temperature amorphous oxide grown by the transport of cations was smooth at the metal-oxide interface. However, the oxide-oxygen interface…
The general instability of a simply supported cylindrical shell under hydrostatic pressure is analysed by considering the ‘distributed stiffness’ of the frames and stringers separately, taking into account their eccentricity. It is shown that frames on the inside of the shell yield general instability loads about 10–1…
A new adaptable deformation apparatus has been developed for constant strain-rate tests up to 5 kb. confining pressure and 500° C. at strain rates from 0.4 to $$3\cdot 10^{-8}/sec$$. In most of the sixty-four tests reported here, jacketed cylinders of Yule marble (oriented parallel, at 45° and normal to the foliation)…
The microstructure of deformed alloys which are susceptible to stress corrosion cracking has been investigated by transmission electron microscopy. It is found that the mode of failure is strongly related to the dislocation distribution. Alloys with a cellular arrangement of dislocation tangles have superior resistanc…
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The susceptibility and torque measurements of antiferromagnetic manganese telluride are made on the samples of single crystals. The spin orientation and structure are studied and discussed for the observed results of the field dependence and field cooling measurements. Some simple calculations are carried out, and som…
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A magnetic and neutron diffraction investigation has been made on MnSb, CrSb, and their solid solutions, which crystallize in the hexagonal NiAs-type structure. MnSb is ferromagnetic and CrSb antiferromagnetic. As CrSb is substituted into MnSb, a canted spin structure is formed, the spins lying within ferromagnetic (0…
The optical properties of powders are determined for the case of particles, large compared with the wave-length of light. The solution for the diffusion of light in a quasi-infinitely thick powder is applied to relate certain measurements obtained on powders with the corresponding properties of the bulk material. In P…
Hexagonal, graphitelike boron nitride may be changed directly into the zincblende cubic form reported earlier or into a new wurtzite form by the application of static high pressures. No catalyst appears to be necessary. At high temperatures, between about 2500° and 4000°K, the zincblende form is favored; at lower temp…