baco0.7zn0.313nb23o3基陶瓷微波介电性能和耐压性能分析word格式论文.docxVIP

AbstractBa[(Co0.7Zn0.3)1/3Nb2/3]O3-basedceramicswerechosenastheresearchobjectiveinthisarticle.Onthebasisofthesolid-statereactionmethod(TSSR)，powderpreparationprocess waschangedin ordertoimprovemicrowavedielectricpropertiesand breakdownstrength oftheBCZNsystem. Glassfritwaschosen to decreasethesinteringtemperatureofceramics.CarbonateandoxidedopingwereusedtoimprovethebreakdownstrengthofBa[(Co0.7Zn0.3)1/3Nb2/3]O3-basedceramics.The aqueousgelcasting-assisted solid-state method (AGAS) and traditionalsolid-statereactionmethod(TSSR)wereusedtoprepareBa[(Co0.7Zn0.3)1/3Nb2/3]O3(BCZN)-basedceramicsinordertoimprovemicrowavedielectricpropertiesof BCZN-basedceramics.Theeffectsofdifferentpowder-preparation methodson microwavedielectricpropertiesandbreakdownstrengthoftheBCZN-basedceramics wereinvestigated.Theresultsshowthat,comparedwiththeTSSR,UsingAGASto prepareceramicpowdershadimprovedthedensityofceramicandthusimprovedthequalityfactorandbreakdownstrengthofthesystem.Atlast,BCZNwithCeO2-addedceramics preparedbyAGAS gotthepropertiesasfollows:Q??f??75843GH,??r=33.7,??f =7.4ppm/℃,BDS=28.68KV/mm.InordertoreducethesinteringtemperatureofBCZN-basedceramics,ZBGandCBSGfritsweredopedintothematerial.TheresultsshowthatZBGandCBSGfritallcouldlowerthedensificationtemperaturetosomeextent.Whensinteredat1400℃,BCZN-0.4wt%CeO2-0.5wt%ZBGobtainedthemostoptimalpropertiesasfollows:??r=33.23,Q??f??23600GHz，BDS=23.31KV/mm.Meanwhile,whensinteredat1400℃,BCZN-0.4wt%CeO2-0.5wt%CBSG got the most optimal properties as follows:??r=33.26，Q??f??33600GHz，BDS=24.95KV/mm.Inordertoreducethesinteringtemperatureandimprovebreakdownstrengthof BCZN-basedceramics,MnCO3 andZrO2 wereaddedintotheBCZNsystem.Whensintered at 1400℃, BCZN-0.4wt%CeO2-1wt%MnCO3 obtainedthe most optimalpropertiesasfollows:??r=34.08，Q??f??10800GHz，BDS=27.74KV/mm.Meanwhile,thestudyshowsthatthedopingofZrO2hadeffectivelydecreasedthegrainsize,whichcouldgetahigherBDSatalowersinteringtemperature.Whensinteredat1350℃, BCZN-0.4wt%CeO2-2wt%ZrO2 obtaine