CAJ | 학술논문

采用TEM、SEM、ESR(电子自旋共振)结合常规压电性能测试手段研究了Cr2O3掺杂对PZT-PMN陶瓷的压电性能、微结构及畴态的影响.压电性能测试结果表明,当Cr2O3含量低于0.06wt%时,可使Kp和Qm同时提高,这说明铬掺杂同时兼具"软掺杂"与"硬掺杂"的双重特性.此外,还发现随着烧结温度的提高，材料性能“硬化”明显.ESR谱分析表明,Cr离子主要以Cr3+和Cr5+的方式共存，随着烧结温度的提高，它有从高价态Cr5+或Cr6+向低价态转变的趋势，这一价态变化被认为是材料性能随烧结温度提高而“变硬”的主要原因之一.TEM图片显示，随着掺杂的Cr2O3的浓度的增大，由于氧空位或受主离子与氧空位构成的缺陷复合体对畴壁的钉扎，电畴将从正规带状畴向波纹状畴转变.
채용TEM、SEM、ESR(전자자선공진)결합상규압전성능측시수단연구료Cr2O3참잡대PZT-PMN도자적압전성능、미결구급주태적영향.압전성능측시결과표명,당Cr2O3함량저우0.06wt%시,가사Kp화Qm동시제고,저설명락참잡동시겸구"연참잡"여"경참잡"적쌍중특성.차외,환발현수착소결온도적제고，재료성능“경화”명현.ESR보분석표명,Cr리자주요이Cr3+화Cr5+적방식공존，수착소결온도적제고，타유종고개태Cr5+혹Cr6+향저개태전변적추세，저일개태변화피인위시재료성능수소결온도제고이“변경”적주요원인지일.TEM도편현시，수착참잡적Cr2O3적농도적증대，유우양공위혹수주리자여양공위구성적결함복합체대주벽적정찰，전주장종정규대상주향파문상주전변.
The effects of Cr2O3 addition on piezoelectric properties，microstructure and morphology of the domain of PZT-PMN ceramics were studied by TEM,SEM,ESR and other conventional electrical methods. The measurement results of piezoelectric properties showed that the Cr2O3 addition was effective in increasing the Kp and Qm when its concentration was below 0.06wt%,which indicated that Cr-doped PZTMN ceramics possessed the properties of “soft” and and“hard” piezoelectrics simultaneously. Furthermore,the properties were found to get “hard” with the increase of sintering temperature even for the ceramics with the same compositions. Electron Spin Resonance (ESR) analysis showed that Cr ion coexisted in both Cr3+ and Cr5+,and the valence change from Cr5+ or Cr6+ to Cr3+ happened when the sintering temperature was increased,which was believed to be one of the reasons for its hardness of the properties. TEM images revealed that,with the increment in Cr content,the normal stripe-like domain changed to wavy domain due to the domain pinning by the defect complexes of acceptor impurities and oxygen vacancies.