{"title":"Study of intrinsic / extrinsic piezoelectric contributions in La-doped BiFeO3 - PbTiO3 ceramics using the Rayleigh method","authors":"T. Comyn, A. Bell","doi":"10.1109/ISAF.2007.4393278","DOIUrl":null,"url":null,"abstract":"BiFeO<sub>3</sub> -PbTiO<sub>3</sub> (BFPT) based materials have received interest as high temperature piezoelectrics due to an extremely high Tc of 632degC, and a spontaneous strain >18%; this high strain makes these materials extremely difficult to pole. Doping with small concentrations of La allows materials to be prepared with a d<sub>33</sub> > 100 pm V<sup>-1</sup> whilst maintaining a T<sub>c</sub> > 450degC. Presented here are results from a Rayleigh analysis of these materials which shows that the extrinsic contribution to the piezoelectric effect is extremely low, providing Rayleigh coefficients (alpha<sub>d</sub>) between 4.2 and 6.3 times 10<sup>-18</sup> m<sup>2</sup>V<sup>-2</sup>, considerably lower than that observed in PZT. The huge deviation from observations in PZT and BiFeO<sub>3</sub> -PbTiO<sub>3</sub> outline considerable domain wall locking in BFPT, which has a detrimental effect on the piezoelectric activity in this system.","PeriodicalId":321007,"journal":{"name":"2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISAF.2007.4393278","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
BiFeO3 -PbTiO3 (BFPT) based materials have received interest as high temperature piezoelectrics due to an extremely high Tc of 632degC, and a spontaneous strain >18%; this high strain makes these materials extremely difficult to pole. Doping with small concentrations of La allows materials to be prepared with a d33 > 100 pm V-1 whilst maintaining a Tc > 450degC. Presented here are results from a Rayleigh analysis of these materials which shows that the extrinsic contribution to the piezoelectric effect is extremely low, providing Rayleigh coefficients (alphad) between 4.2 and 6.3 times 10-18 m2V-2, considerably lower than that observed in PZT. The huge deviation from observations in PZT and BiFeO3 -PbTiO3 outline considerable domain wall locking in BFPT, which has a detrimental effect on the piezoelectric activity in this system.
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