▎ 摘　　要

NOVELTY - Producing graphene comprises contacting a solid catalyst in a divided state comprising at least one mixed oxide (I) with a gaseous composition flow comprising at least one carbon source in a gaseous state, where the solid catalyst has a single crystal structure and is selected as a function of an average crystalline domain size of the solid catalyst to produce graphene having a thickness of less than 15 nm and at least one dimension perpendicular to the thickness of 0.1-500 mu m. USE - The method is useful for producing graphene, preferably graphene powder, which is useful for manufacturing electron conducting materials, heat conducting materials, composite materials, electrodes (all claimed), and microprocessors. ADVANTAGE - The method produces graphene with high yield and low cost without large equipments and adhesive surface coat. DETAILED DESCRIPTION - Producing graphene comprises contacting a solid catalyst in a divided state comprising at least one mixed oxide of formula (AFe2O4) (I) with a gaseous composition flow comprising at least one carbon source in a gaseous state, where the solid catalyst has a single crystal structure and is selected as a function of an average crystalline domain size of the solid catalyst to produce graphene having a thickness of less than 15 nm and at least one dimension substantially perpendicular to the thickness of 0.1-500 mu m. A = metal element with mixed valence to present at least two valences, where one of the valences of the element metal with mixed valence is +2. An INDEPENDENT CLAIM is included for a graphene powder obtained by the method, where the graphene powder is formed of solid particles having a thickness of less than 15 nm and at least one dimension substantially perpendicular to the thickness of 0.1 mu m.