SrZn-,2--W鐵氧體-SrTiO-,3-納米復合材料的制備及表征.pdf

1、中北大學碩士學位論文SrZnW鐵氧體SrTiO納米復合材料的制備及表征姓名：李保東申請學位級別：碩士專業(yè)：應用化學指導教師：李巧玲20090329中北大學學位論文PreparationandCharacterizationofNano—compositeofSrZn2一WFerriteandSrTiOaABSTRACTInthetext，thedevelopmenthistoryandnewprogressofMicrowaveabso

2、rbingmaterialssuchasferrite，ferroelectricandSrZn2Wferrite／SrTi03nanocompositeandtypicalpreparationmethodofnano—materialswereintroducedWehaveemployedcitricacidmethodtoobtainWtypeferrite，SrTi03andSrZn2一Wferrite／SrTi03nanoc

3、ompositeCitricacidmethodasasolutionbasedmethod，whichallowsmixingofprecursorsatthemolecularlevel，hasanadvantageinthepreparationofultrafinematerialsInthecitricacidmethodreagentsaleverysimple，specialequipmentisnotneeded，Ion

4、—substitutionscanbeeasilyintroducedintothefinalproduct，andmaterialswithhighpurityweresynthesizedInthisdissertation，wepreparedthenanomaterialsbycitricacidmethodX—raydiffraction(XRD)，Infrared(IR)spectroscopyVibratingsimple

5、magnetometer(vSM)andTransmissionelectronmicroscopy(TEM)wereusedtocharacterizethethermaldecompositionbehavior，thecrystallizationprocess，theparticlesizeandmorphologyofthecalcinedpowdersThemajorworkissummarizedasfollows：(1)

6、EffectsofmicrostructuresandmagneticpropertiesinvariousconditionshavebeeninvestigatedTheamountsofcitricacid，thewatervolume，pHvalue，calcinationtemperatureandtimeweredeterminedtopreparepurefinewell—dispersednanoSrZn2Fel6027

7、withcitricacidmethodWehaveobtainedthebestsynthesisconditions(2)Ion—substitutionsCanaltermicrostructuresandmagneticpropertiesofWtypeferritestosatisfyvariousrequirementsindifferentapplicationrealmsThespecificsaturationmagn

8、etization(胍)，thespecificremanentmagnetization(Mr)andthecoerciveforce(Hc)changeddifferentlywithincreasingC02OrNi2contentcontent(3)EffectsofmicrostructuresandmagneticpropertiesinvariousconditionshavebeeninvestigatedThewate