Wyckoff, Ralph

Wyckoff, Ralph Walter Graystone was born in 1897 and died in 1994. He was the author of the classic book. The Stucutre of Crystals, 1931. 

Both general and special positions are also called Wyckoff positions, in honor of the American crystallographer Ralph Walter Graystone Wyckoff (1897-1994). Wyckoff s 1922 book. The Analytical Expression of the Results of the Theory of Space Groups, contained tables with the general and special positional coordinates permitted by the symmetry elements. This book was the foremnner of International Tables for X-ray Crystallography, which first appeared in 1935. 

Ralph Walter Graystone Wyckoff (1897-1994) publishes The Analytical Expression of the Results of the Theory of Space Groups, containing positional coordinates for general and special positions permitted by the symmetry elements. 

Pfeiffer s application of Werner s theory to crystals and the advent of new experimental techniques led a number of scientists in various countries to use X-ray diffraction to determine crystal structures of coordination compounds. American chemist Ralph W. G. Wyckoff(l 897-1994) chose ammonium hexachloroplatinate(IV) as a crystal that should... 

Ralph W. G. Wyckoff, one of the contributors to this symposium volume, found that the nitrogen atom in tetramethyl and tetraethyl ammonium halides is surrounded tetrahedrally by the methyl or ethyl groups 128, 129),... 

The Structure of Crystals (Second Edition) and Supplement lo. Second Edition. By Ralph W. G. Wyckoff. 

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