简介:Tounderstandtheelectronicandmagneticproperties,wehavestudiedCr-dopedzinc-blendeAINsystemindetailbyapplyingafirst-principleplanewavepseudopotentialmethodbasedonthedensityfunctionaltheorywithinthelocalspindensityapproximation.Theanalysesofthebandstructures,densityofstates,exchangeinteractions,andmagneticmomentsshowthatAl_(1-x)Cr_xNalloysmayexhibitahalf-metallicferromagnetismcharacter,thatCrinthediluteddopinglimitformsnear-midgapdeeplevels,andthatthetotalmagnetizationofthecellis3μ_BperCratom,whichdoesnotchangewithGrconcentration.Moreover,wehavesucceededinpredictingthatAl_(1-x)Cr_xNalloysinx=0.0625hasaveryhighCurietemperature,andfindthatferromagneticexchangeinteractionbetweenmagneticdopantsisshort-ranged.
简介:越野车中的本田(Honda)CR-V可以说是本田众多车系中的一个代表,虽说本田CR-V是越野车型在其身上也还是可以看出那颇为本田化的车系的影子。本田CR-V在造型设计上,完全走的是吉普车化的路线,四轮驱动的全天候调设置,高大威猛的造型,总是透露着一种狂野的性情。但是,你如果认为它是难以驾驭的,那你可就大错特错了,当你驾驶上本田CR-V时,才会发现它其实还是一辆比较柔和的越野车。在内部设计方面,本田CR-V毫无疑问是非常的宽敞。本田CR-
简介:Ba1.0Co0.7Fe0.2Nb0.1O3-δ(BCFN)oxidewithperovskitecubicstructurewassynthesizedbysolidstatereactionmethod.CO2corrosionofBCFNmembranewasinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),diffusereflectanceinfraredFouriertransformedspectroscopy(DRIFT)andX-rayabsorptionfinestructurespectroscopy(XAFS).Cobalt(Co)K-edgeabsorptionspectraofBCFNannealedinCO2revealthattheoxidationstatesofCoinallthesampleswerelargerthan+3andtheydecreasedwiththeincreaseofcalcinationtime.At800℃,1%CO2introducedintoHecouldspeedupthereductionofCocationsincomparisonwithpureHe.Inaddition,sulfateionsinthebulkofBCFNmembranepreferredtomigratetothesurfaceunderCO2calcinationandformmonoclinicBa(CO3)0.9(SO4)0.1besidesorthorhombicwitherite.Moreover,SEMresultsindicatethatthenucleationandgrowthofcarbonatesgrainsstartedatthegrainboundaryofthemembrane.