▎ 摘　　要

NOVELTY - Preparing nano-yttria powder e.g. comprises (i) adding graphene oxide in ethanol solvent and ultrasonically dispersing to obtain alcohol solution of oxidized graphene, (ii) dissolving xylitol and sodium bisulfate in water to obtain xylitol aqueous solution, (iii) dissolving yttrium nitrate hexahydrate in water to obtain yttrium nitrate aqueous solution, and (iv) adding yttrium nitrate solution into xylitol aqueous solution, adding alcohol solution of graphene oxide, stirring, adding sodium hydroxide solution, regulating pH of solution to 8-11 and reacting to obtain initial reaction solution. USE - The powder is useful for lubricating oil, ceramics, superconducting materials and fuel cell (claimed). ADVANTAGE - The powder is environmentally friendly. DETAILED DESCRIPTION - Preparing nano-yttria powder comprises (i) preparing alcohol solution of oxidized graphene: adding 0.1-0.5 g graphene oxide in 100 ml ethanol solvent and ultrasonically dispersing for 15-60 minutes to obtain alcohol solution of oxidized graphene, (ii) preparing xylitol aqueous solution: dissolving xylitol and 0.5 g sodium bisulfate in 100 ml water to obtain xylitol aqueous solution, (iii) preparing yttrium nitrate aqueous solution: dissolving yttrium nitrate hexahydrate in water to obtain 5-35% yttrium nitrate aqueous solution, (iv) preparing nano-yttrium oxide powder: adding the yttrium nitrate solution into the xylitol aqueous solution, stirring for 5-15 minutes, then adding alcohol solution of graphene oxide, stirring for 1-5 minutes, then adding sodium hydroxide solution, regulating pH of the solution to 8-11 at 80-120 degrees C, reacting for 1-2 hours to obtain initial reaction solution, then adding nano-silicon dioxide in the initial reaction solution, adding the initial reaction liquid in the aging kettle, aging at 100 degrees C for 3 days, then filtering, washing, drying and roasting to obtain the nano-yttria powder.