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《鏑鉺摻雜BaTiO3陶瓷的制備與介電性能》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、哈爾濱工業(yè)大學(xué)工學(xué)碩士學(xué)位論文摘要采用溶膠凝膠法制備了分別摻雜DyEr的BaTi偽陶瓷，摻雜摩爾分?jǐn)?shù)分別為0.001,0.002,0.003,0.005,0.007的BaTi03陶瓷，并對其結(jié)構(gòu)、導(dǎo)電性和介電性的變化進(jìn)行了研究，XRD結(jié)果表明:DyEr摻雜BaTi03陶瓷的晶相，仍為四方相。通過DyEr對BaTiO3陶瓷的摻雜，使其導(dǎo)電性發(fā)生了明顯的變化。當(dāng)Dy的摻雜摩爾分?jǐn)?shù)為0.005時，室溫電阻率從純BaTiO3的2.6X10"Q。。下降為4.19X1少0·m,然后隨著摻雜濃度的增加有所上升，呈現(xiàn)U型變化曲線。當(dāng)Er的摻雜摩爾分?jǐn)?shù)為0.007時，室溫電阻率為1.85X1
2、口。。。m>DyEr摻雜BaTi偽陶瓷的交流電導(dǎo)隨著溫度的升高而增大，在Curie點附近達(dá)到最高，而后隨著溫度的升高反而下降，里現(xiàn)PTC效應(yīng)。DyEr摻雜使BaTi03陶瓷的介電性也發(fā)生了明顯的變化。Dy摻雜使BaTiO3陶瓷介電溫譜呈現(xiàn)明顯的PTC效應(yīng)，居里溫度降低為127.30C6Er摻雜使BaTiO3陶瓷的介電常數(shù)升高，居里溫度升高為130.91C.Er摻雜BaTiO3陶瓷的頻率特性優(yōu)于Dy摻雜BaTi03陶瓷。對DyEr摻雜BaTi03陶瓷的導(dǎo)電性和介電性的變化機(jī)理進(jìn)行了初步分析，根據(jù)容差因子計算初步確定Dy摻雜是同時取代鋇離子和欽離子，Er摻雜主要以取代欽離子為主
3、。關(guān)鍵詞稀土;欽酸鋇陶瓷:導(dǎo)電性:介電性哈爾濱工業(yè)大學(xué)工學(xué)碩士學(xué)位論文AbstractBaTi03ceramicsdopedwithvariousqualitiesofDyandErwerepreparedrespectively(theadulterateconcentrationsare0.001,0.002,0.003,0.005,0.007mo1)throughaSol-Gelmethodandtheirelectricalpropertiesanddielectricpropertieswerestudied.ItisfoundthatthephaseofBaTi
4、03ceramicdopedwithDyandErisstilltetragonalphase.TheadulterationofDyandErmaketheelectricalpropertiesalterevidently.WhentheadditionofDyis0.005mol,theresistivitydecreasetothesmallest,whichchangesfrom2.6X1012?！nto4A9X10'?！.WhentheadditionofEris0.007mol,theresistivitydecreaseto1.85X10'00·m.Th
5、econductanceofthemodifiedBaTi03ceramicsdopedwithDyandEralterwiththechangeoftemperatureandexhibitanobviousPTCeffectThedielectricpropertyofBaTiO3ceramicschangedistinctlyafterBaTi03ceramicsdopedwithDyandET.ThedopingofDygiverisetothedielectrictemperaturefigureshowanevidentlyPTCefectandtheCurie
6、temperaturedecreaseto127.3'CeThedielectricconstantofBaTiO3ceramicsalsopresentPTCefectunderdiferenttemperatureaftertheadulterationofErandtheCurietemperatureis130.9'CThefrequencyofBaTi03ceramicsdopedwithErisgoodthanthatofBaTiO3ceramicsdopedwithDy.Thechangingmechanismofelectricpropertyanddiel
7、ectrcpropertyofmodifiedBaTi03ceramicsdopedwithDy,Erisdiscussedinitially.ItisdeterminedtheDyionreplacetheBaionandtheTiionintheBaTi03ceramicatthesametime,onthecontrarytheaimofreplacingofErionistheTiionintheBaTi03ceramic.Keywordsrareearth;BaTi03ceramics;electricp
