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碳酸锂掺杂对PFN－PNN－PZT陶瓷微结构和电学性能的影响

DOI: 10.7521/j.issn.0454－5648.2014.02.11

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Abstract:

采用传统固相烧结法制备了(1－x)Pb[(Fe1/2Nb1/2)0.1(Ni1/3Nb2/3)0.45(Zr0.3Ti0.7)0.45]O3－xLi2CO3(PFN－PNN－PZT－xLi,x＝0、0.5%、1.0%、1.5%、2.0%)压电陶瓷，研究了不同Li2CO3含量(x)对陶瓷微观形貌、相结构、介电、压电和铁电性能的影响。X射线衍射和扫描电子显微镜分析表明制备的陶瓷样品均为单一钙钛矿结构，未探测到其他杂相；随着Li2CO3含量的增加，陶瓷的晶体结构从三方相向四方相转变。电学性能测试表明Li2CO3掺杂几乎不影响PFN－PNN－PZT陶瓷的特征Curie温度，但能显著提高介电温度系数γ；随着Li2CO3掺杂量的增加，陶瓷压电常数d33和机电耦合系数kp降低，而相应的机械品质因数Qm和矫顽场Ec增大，说明Li2CO3表现为“硬性”掺杂特点；当x＝1.5%时，1200℃烧结2h的陶瓷具有相对较好的电学性能d33＝820pC/N，kp＝0.63，相对介电常数εr＝6628，tanδ＝0.028，介电温度系数γ＝17%，Qm＝52.6，Ec＝4.48kV/cm。

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