简介：Rareearthuhrafineparticlehasbeenpaidagreatattentiontoinrecentyearsaroundtheworldbecauseofitsincreasingapplicationsinfunctionalmaterials.Preciseceramicsisatypicalexample.Thepartiealsizesfortheproductnowavailableareusuallyintherangeof100-1000(1=1010m)withlargespecificsurface,say,70—120m2/g.Ultrafinepowdersareusuallyclassifiedinto3gradesdependingontheirpar-ticlesizes,thusthefirstbeingintherangeof10—
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