抄録
The crystal structure of tungsten trioxide at room temperature has been studied by the X-ray oscillation method. The crystal has a monoclinic unit cell with a=7.30 Å, b=7.53 Å, c=7.68 Å and β=90°54′, containing eight molecules of WO3. c axis length is as twice as the values reported by the other authors. The space group is P21⁄n. The structure analysis was performed by trial and error based on inspection of the Patterson projections along a and c axes. The arrangement of tungsten atoms is similar to the structure reported by Braekken. The positions of oxygen atoms, which had been determined hitherto mainly from packing considerations, could be obtained directly from the weak reflections with odd index l. According to the obtained structure the crystal is antipolar in the directions of a, b and c axes.
