Graphical Determination of Hexagonal and Tetragonal Crystal Structures from X-Ray Data

Abstract

Graphic Method for Interpreting X-Ray Patterns of Powders.—For each type of lattice the logarithms of the theoretical spacings of the different planes are plotted as functions of the axial ratio. Six such plots are reproduced, three for the hexagonal and three for the tetragonal system. By plotting the logarithms of the observed spacings on the edge of a strip of paper, this may be fitted by trial to the theoretical plot; the axial ratio and type of lattice being thus found in a few minutes.