By P. P. Ewald (auth.), P. P. Ewald (eds.)
Origin, Scope, and Plan of this booklet In July 1962 the 50th anniversary of Max von Laue's discovery of the Diffraction of X-rays through crystals goes to be celebrated in Munich through a wide overseas staff of crystallographers, physi cists, chemists, spectroscopists, biologists, industrialists, and so on who're utilising the tools according to Laue's discovery for his or her personal learn. The invitation for this social gathering should be issued together through the Ludwig Maximilian collage of Munich, the place the invention was once made, by way of the Bavarian Academy of Sciences, the place it was once first made public, and by means of the foreign Union of Crystallo graphy, that is the overseas association of the nationwide Committees of Crystallography shaped in a few 30 international locations to repre despatched and enhance the pursuits of the 3500 examine staff during this box. The 12 months 1912 is also the delivery 12 months of 2 branches of the actual sciences which constructed swiftly from Laue's discovery, particularly X-ray Crystal constitution research that is such a lot heavily associated with the names ofW. H. (Sir William) Bragg and W. L. (Sir Lawrence) Bragg, and X-ray Spectroscopy that's linked to the names of W. H. Bragg, H. G. J. Moseley, M. de Broglie and Manne Siegbahn. Crystal constitution research started in November 1912 with the 1st papers ofW. L. Bragg, then nonetheless a scholar in Cambridge, during which, by way of research of the Laue diagrams _of zinc blende, he decided the proper lattice upon which the constitution of this crystal is built.
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Additional resources for Fifty Years of X-Ray Diffraction: Dedicated to the International Union of Crystallography on the Occasion of the Commemoration Meeting in Munich July 1962
Not 24 THE BEGINNINGS until 1887 was the non-validity of Cauchy's relations convincingly demonstrated by Woldemar Voigt's measurement of elastic deformations of anisotropic crystals. Yet, long before the convincing proof, it seemed probable that the Cauchy relations did not hold, and this opinion discredited the model from which the relations sprang, namely that in the natural state of a crystal its molecules are arrayed in a three-dimensional lattice. Thus it came about that the concept of internal regularity and periodicity as a characteristic for crystalline matter, after having emerged in a very promising way, lay dormant for more than seventy years as a brilliant, but unfortunately not acceptable speculation which neither physicists nor crystallographers dared to use seriously.
Altogether measurements on between 9000 and 10 000 substances are critically discussed in Chemische Kristallographie, an astounding feat considering the small number of the team and the other work they had to do in routine training of students. The connection between Groth and his colleagues in Chemistry, Willstatter, Fajans and others was naturally stronger than with the physicists, but Groth's keen mind was always on the look-out for any method that could initiate a more direct approach to the problems of crystal chemistry.
Sohncke (1867), and A. Schoenflies and E. von Fedorov (both 1891). Common to all of them are the following features: (1) Symmetry axes of order 5,7 or higher are geometrically not compatible with a periodic structure; this is in accordance with the laws deduced from the morphology of crystals. e. a parallelopipedon containing one or more particles; its shape and volume Va is determined by three edges aI, a2, a3 meeting in a corner point. The edges are called the translations, because by shifting the cell and its contents parallel to itself by integer multiples of the edges the entire structure is obtained from an original cell.