Materials Literature
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A complete treatment is given of the steady state spiral both in growth and evaporation of crystals, taking account of the strain energy around the dislocation. It is shown that when the crystal is evaporating there is a limiting value of the undersaturation beyond which there is no steady state solution of the proble…
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Above the Curie temperature, pyroelectric currents can be produced in single crystals of barium titanate even though there is no electric field applied. The polarization that remains at these temperatures is ascribed to space-charge fields in the crystal. From studies of the wave forms of the pyroelectric current sign…
Abstract Measurements have been made of the intensities of up to 25 orders of the low-angle X-ray diffraction patterns of wet and dry collagen fibres from three different sources. From these data Patterson functions have been plotted, and using these curves, and the known results of electron microscopy as guides in ma…
With the aim of determining to what extent the energy distribution of secondary electrons from targets of Mo and W may contain fine structure, measurements have been made using primary energies from 100 to 2000 electron volts. An electrostatic analyzer of the 127-degree type having an experimentally determined resolut…
It is shown that in a demagnetized crystal in which closure domains do not form, the domain pattern on a surface perpendicular to the easy-magnetization axis varies with the thickness of the crystal. For thin crystals the domain configuration should consist of plane-parallel walls. As the thickness of the crystal is i…
The width of the ferromagnetic resonance has been measured at 10 000 Mc/sec in polycrystalline mixed ferrites of the composition ${\mathrm{Co}}_{\ensuremath{\alpha}}{\mathrm{Ni}}_{1\ensuremath{-}\ensuremath{\alpha}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$, with $\ensuremath{\alpha}$ between 0 and 0.04. The minimum line widt…
Abstract The problems of structure and reactivity of the azides are of course closely related to their thermochemistry. Lattice energies, electron affinities and bond energies are especially important. Although numerous investigations have been made both into slow thermal decomposition and explosive decomposition of t…
Abstract Crystals with a very open lattice, such as silicon, germanium, etc., having the cubic (A 4 or B3) structure, all tend to increase their interatomic distance by fairly large amounts on solidification from the melt, and severe stresses can be set up if conditions are such that the crystal cannot expand freely…