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Slightly twinned and untwinned single crystals of Ba2NaNb5O15 have been studied by X‐ray techniques. Oscillation and full rotation X‐ray photographs show the c axis to be twice the previously reported value; therefore, there are 8 formula units per unit cell. It was also found that Cmm2...
A new study of the structure of vitreous silica has been made under greatly improved conditions. Using Rh Kα radiation with the method of fluorescence excitation, reliable intensity values were measured to 4π sinθ/λ = 20. The interpretation was in terms of pair functions, thereby eliminating...
For the measurement of crystallite orientation in regenerated cellulosic fibers, Hermans and co‐workers defined a parameter K in terms of the intensity distribution in the (10, 021) sickle. Their theory is extended in the present study to mercerized fibers. It is found from the experimental...
The strain induced phase transformations produced in lead monoxide powders by ball milling at temperatures ranging from −196 to 200°C have been studied by X‐ray diffraction methods. It has been found that either of the two polymorphs, litharge and massicot, was partially converted to the...
Apparent particle sizes corresponding to the slope and intercept of the variance‐range curve are interpreted geometrically; the analytical results of Lele & Anantharaman for cylinders and certain prisms are confirmed. The slope apparent particle size is half the harmonic mean of hsec ϕ and...
The theory of the direct comparison X‐ray method of phase analysis is extended to correct for preferred orientation effects. Texture parameters are defined to assess the type and intensity of preferred orientation using data from diffractometer patterns. The analysis is illustrated with results...
A new method of etching diamond is described which produces rapid etching and etch patterns which are decidedly better and more easily interpreted than those produced by the conventional method. It is also shown that the new method produces etch patterns having the same morphology as that of...
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