Patent ID: 7585480

Claim:
A method for producing a powder represented by the formula SiO x comprising: reacting monosilane gas, SiH 4 ,with a gas containing oxygen capable of oxidizing the monosilane gas in the presence of a non-oxidizing gas, under a pressure of from 10 to 1000 kPa at a high temperature of from 500 to 1000° C. in a reaction zone to produce SiO x powder, wherein x is from 0.6 to 1.8, the SiO x powder has a specific surface area of at least 10 m 2/ g and a total content of Na, Fe, Al and Cl of at most 10 ppm, and the gas capable of oxidizing the monosilane gas is supplied to the reaction zone without prior mixing with the monosilane gas, and the high temperature in the reaction zone is obtained by heating the reaction zone on its periphery.