Refinement of the Crystal Structure of Ruthenium Dioxide.

Abstract

Crystals of RuO2 were prepared, and powder, rotation, and Weissenberg photographs were taken. RuO2, which has a rutile structure, crystallizes in space group P42mnm, of the tetragonal system. The cell dimensions are a 4.491. and c 3.1066 Å, and Z = 2. The structural parameter has been detected by using 3-dimensional x-ray data and found to be x = 0.306 ± 0.002. The R value was 0.071 based on a total of 235 observed independent reflections. Ru is octahedrally coordinated by O; 4 of the 6 Ru-O distances are 1.98 4 ± 0.006 Å and the other 2 1.942 ± 0.010 Å. The difference in bond length is quite small, only 2%, but should be regarded as significance according to the Cruickshank test. The closest Ru-Ru distance is 3.107 Å, so that there can be no significant interaction between the metal atoms.