Materials Literature
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A method is described for comparing microscopically the cross-sectional areas of the same cotton fiber in wet and dry conditions, for evaluation of swelling. Results indicate the change in cross-sectional area of raw cotton fibers to be between 21 % and 34% of the dry area regardless of variety of cotton or degree of…
The self-diffusion coefficient of sodium in sodium chloride and sodium bromide has been measured as a function of temperature. A comparison of the self-diffusion coefficient with the electrolytic conductivity reveals that the Einstein relation is satisfied at high but not at low temperatures. The temperature dependenc…
The first three electronic transitions of porphine and the first five electronic transitions of tetrahydroporphine are predicted as simple one-electron LCAO molecular orbital transitions (with overlap included). The electron densities and bond orders in the ground states are also computed. The observed levels are tent…
Compounds of gallium and germanium isostructural with the feldspars have been prepared, and some of their crystal-chemical properties are here described. In the Na and K feldspars, $$Al^{+++}$$ and $$Si^{++++}$$ can be completely replaced by $$Ga^{+++}$$ and $$Ge^{++++}$$; but, in pure Ca feldspar, complete substituti…
A number of recent researches have been concerned with magnesium germanate phosphors. An improved such phosphor is reported here having over twice the brightness of the previous compositions as prepared in this laboratory, and which shows peak luminescence efficiency at temperatures near 350°C. Temperature dependence…
The phase relationships in the system zirconia‐ceria were investigated by X‐ray diffraction and dilatometric methods. The specimens were prepared by mixing and compacting the oxide powders and firing at 2000°C. At 2000°C. zirconia and ceria are miscible in each other from about 24 to 100 mole % ceria. The range of sol…
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