The existence of 'fl-W' as a modification of tungsten is contradicted by the low density of the phase and by its decomposition into W and WO,. at about 700°C. It is assumed that 'fl-W' is a metallic tungsten oxide with the probable ideal formula W30. The unit cell would then contain 6 W+20 atoms distributed at random over the eight positions of the A15 structure.
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