▎ 摘　　要

NOVELTY - R-graphene oxide/ferroxdure/cobalt iron oxide composite powder is represented as RGO/xBaFe12O19/(1-x)CoFe2O4, where x is 0.6-0.9. USE - R-graphene oxide/ferroxdure/cobalt iron oxide composite powder. ADVANTAGE - The R-graphene oxide/ferroxdure/cobalt iron oxide composite powder is easy to prepare, and has low dielectric loss, high impedance characteristic, low power consumption performance and excellent wave-absorbing performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for preparing R-graphene oxide/ferroxdure/cobalt iron oxide composite powder, which involves adding graphene oxide and ethylene glycol to the vessel, uniformly dispersing xBaFe12O19/(1-x)CoFe2O4 composite powder, uniformly mixing solution, where ratio of graphene oxide, ethylene glycol and xBaFe12O19/(1-x)CoFe2O4 composite powder is 1g:1L:(3-6)g, mixing solution at 150-200 degrees C and carrying out hydrothermal reaction for 24-26 hours, and washing obtained product with water and drying to obtain R-graphene oxide/ferroxdure/cobalt iron oxide composite powder; and (2) a method for preparing xBaFe12O19/(1-x)CoFe2O4 composite powder, which involves dissolving pure barium nitrate, cobalt(ii) nitrate hexahydrate, iron(iii) nitrate nonahydrate and citric acid monohydrate in deionized water, adding metal ions, adding aqueous ammonia drop-wise to adjust pH to 6.8-7.3, uniformly stirring at 75-85 degrees C and drying to obtain xerogel, milling xerogel, calcining at 950-1100 degrees C for 3-5 hours to obtain xBaFe12O19/(1-x)CoFe2O4 composite powder.