Atomic Structure and Vibrations in Zinc Crystals. IV. Diffuse Scattering of X-Rays at Different Temperatures

Abstract

Further experiments have shown that in diffuse scattering experiments from single crystals of zinc the surfaces of the artificial crystals must be plane to ${10}^{\ensuremath{-}5}$ cm if the measurements are to be reliable. Methods of annealing and polishing the crystals are described in which this degree of planeness is obtained without producing a Beilby layer. The diffuse scattering was measured for orientations of 3\ifmmode^\circ\else\textdegree\fi{} and 90\ifmmode^\circ\else\textdegree\fi{} at a scattering angle of 30\ifmmode^\circ\else\textdegree\fi{} at temperatures of 100\ifmmode^\circ\else\textdegree\fi{}, 200\ifmmode^\circ\else\textdegree\fi{}, 298\ifmmode^\circ\else\textdegree\fi{}, 370\ifmmode^\circ\else\textdegree\fi{}, 550\ifmmode^\circ\else\textdegree\fi{}K. A method of obtaining the ratio of the mean square displacement parallel to that perpendicular to the principal axis is described. In this method there is no need to know the spectral distribution of the radiation used. Further discussion is deferred to paper VI.