堿金屬鈮鉭銻酸鹽無(wú)鉛壓電陶瓷的制備和性能表征.pdf

1、合肥工業(yè)大學(xué)碩士學(xué)位論文堿金屬鈮鉭銻酸鹽無(wú)鉛壓電陶瓷的制備和性能表征姓名：方旭升申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：左如忠20090301ThePreparationandPerformanceCharacterizationof(Sb，Ta，Li)ModifiedAlkaliMetal—ContainingNiobate—BasedPiezoceramicsABSTRACTTheSb，TaandLimodifiedsodium—p

2、otassiumniobatesystemhasbeenaresearchfocusinthelead—freepiezoelectricceramicsfieldnowadaysBecausetheelectronegativityofSbishigherthanthatofNb，itcanstrengthenthecovalencyofthesystem，improvethepiezoelectricperformances，and

3、thustheamountofSbisfixedatahighvalueinthisthesis(6m01％)ConsideringthatvolatilizationofNaismoreseriousthanthatofKinthesinteringprocess，theamountofNaisusedslightlymorethanthatofKOnthebasisofthiscomposition，(Na052K048)(Nbo9

4、6Sb004)03，LiandTainequalmolarratioareaddedtoformanmorphotropicphaseboundary(MPB)inthehopeofimprovedperformances：Then，thesinteringprocessisoptimized，andtheinfluenceofCuO—dopingontheperformancesisinvestigatedCompleteandhom

5、ogeneoussolidsolutionscanformbetweenLi，Ta，Sb十ionsandsodiumpotassiumniobatewithinthestudiedscopeTheadditionoflithiumtantalate(TL)improvesthesinteringperformances，whiletheparticlesizedistributionisnotuniformWithincreasingt

6、heamountofTL，thephasestructureatroomtemperatureischangedfromanorthorhombicphasetoatetragonalphasesuchthatanMPBiSformedwithin0035x004TheCurietemperature(Tc)increaseswithincreasingtheamountofLTandthephasetransitiontemperat

7、urebetweenorthorhombicphaseandtetragonalphase(Tot)movestoomtemperaturesuchthattheperformancesareimprovedExcellentperformancesarepresentinthecompositionwithx=004，d33=335pC／N，kp=53％，6；3=2063，Qm=41，Te=291℃，showingthepotenti

8、alforpracticalapplicationTheresultshowsthattheperformancescanbeimprovedinthewaythatthemoreamountofSbisaddedandthecomponentisdesignedneartheMPBItisfoundthattheinfluenceofthesinteringprocessontheperformancesisgreatThelower

9、sinteringtemperature，theshortersoakingtimeandNaexcessesintheinitialcompositiontendtocauseabnormalgraingrowthWithincreasingsinteringtemperatureandsoakingtime，thegraingrowsbetter，andthedensityincreasesandreachesitsmaximuma