X-Ray Crystal Analysis of Thirteen Common Metals

Crystal Structure of Thirteen Metals Determined by X-ray Analysis.---The author's method of powder analysis was used. In the case of anisometric substances, the crystal system and axial ratio were found by means of plots by the method described in the preceding ${\mathrm{paper}.}^{2}$ The lattices of chromium, molybdenum and tantalum were found to be body centered cubes with sides 2.895, 3.143 and 3.272 \AA{}. respectively; cobalt alpha, nickel, rhodium, palladium, iridium and platinum have face centered cubic lattices with the sides of the cubes 3.554, 3.540, 3.820, 3.950, 3.805 and 3.930 \AA{}. respectively; cobalt beta, zinc, cadmium and ruthenium have hexagonal lattices of the "close-packed" type with axial ratios 1.63, 1.86, 1.89 and 1.59 respectively and with the triangular sides 2.514, 2.670, 2.960 and 2.686 \AA{}. respectively; and indium has a face-centered tetragonal lattice with axial ratio 1.06 and the side of elementary prism 4.58 \AA{}. The structures found for cadmium, zinc and indium are close packed arrangements of solid prolate spheroids while that for ruthenium is a close packed arrangement of oblate spheroids.