We have been investigating the reductive decomposition of spray dried ammonium metatungstate (AMT). Reduction of the pyrolysed powder in flowing hydrogen at T≥625°C creates a high surface area microcrystalline form of α-W, with bcc structure. Reduction at T≤575°C results in the formation of a high surface area nanocrystalline form of β-W, with A15 structure and chemical composition of W3O. The ideal A15 structure of W3O (isostructural with Nb3Sn) is a bcc lattice of oxygen atoms with tungsten atoms arranged in pairs on cube faces. In situ reduction experiments carried out in a controlled atmosphere, high temperature X-ray powder diffractometer have shown that W3O transforms to elemental β-W, in which all or nearly all of the oxygen atoms are absent. Various experiments confirming the existence of metastable elemental β-W are described. Initial experiments on its alloying behavior are also discussed.