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A high-pressure modification of tungsten dioxide (hp-WO 2 ) was synthesized at 80 kbar and 1120 K. The structure was determined from X-ray powder diffraction data: hp-WO2,  M  = 215.85, space group Pnma,  a  = 9.7164(3) Å,  b  = 8.4380(3) Å,  c  = 4.7564(2) Å,  Z  = 12,  D  x  = 11.03 g cm −3 , R wp  = 0.12 and R B  = 0.078 from Rietveld refinement. Although the heavy atom structure may be reasonably well described in space group Cmcm, the total structure can only be described in Pnma. The important information contained in non observable and very weak reflections is discussed.

X-ray powder crystal structure analysis of high pressure tungsten dioxide. On the information in weak reflections