Reduction of solid silicon monoxide by elemental metals

Reaction of solid SiO with calcium in various ratios at 900 degreesC result s in the formation of a mixture of CaO, CaSi and Ca5Si3. When the reaction (in a 1:3 ratio) is carried out at 750 degreesC, CaO and Ca3SiO are formed. The structure of the latter compound, which is erroneously described in th e literature as "cubic Ca2Si'', was determined from powder diffraction data . In the reaction mixtures of solid SiO with strontium or titanium, SrSi, S rSi2 and Ti5Si3 were identified. Reaction with aluminium did not result in the formation of a silicide, but of elemental silicon instead.