A Graphical Method for Selecting Suitable Targets for Precision Determination of Cubic Lattice Constants and for Solving Cubic Powder Patterns

Graphical charts from which the angles of diffraction lines may be obtained as a function of lattice constant and radiation have been prepared for cubic powder patterns. The charts are especially useful in predicting positions of back-reflection lines in order that suitable targets for precision determinations of lattice constants may be chosen. Moreover, cubic powder patterns may be quickly indexed, beta-lines identified, and lattice constants read to better than one percent. No calculations are necessary after the angles of diffraction have been measured.