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Co-doping Ce3+ and Mn4+ to Induce Pseudo Tetragonal Distortion in CaBi2Nb2O9 for Improved Piezoresponse

CERAMICS INTERNATIONAL(2025)

Hunan Univ

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Abstract
Calcium bismuth niobate (CBN), known for its high Curie temperature (TC), has been investigated as a potential material for vibration sensor due to its ability to operate at elevated temperatures. However, the inherent weakness in piezoresponse of CBN has limited its sensing performance. In this study, a pseudo-tetragonal distortion in CBN was successfully induced by incorporating Ce3+ ions into the (Bi2O2)2+ layers of CBN. This modification led to a change in the interaction between the perovskite and bismuth layers, resulting in enhanced piezoelectric and ferroelectric properties. Further enhancement was achieved by introducing Mn4+ ions into the Ce3+-doped CBN. The co-doped CaBi1.96Ce0.04Nb1.985Mn0.015O9 demonstrated a significantly improved piezoelectric coefficient (d33) of 15.9 pC/N, compared to 6.8 pC/N for pure CBN ceramics, and an increased remnant polarization (Pr) of 20.78 mu C/cm2, compared to the 3.83 mu C/cm2 of the pure material. This work not only deepens the understanding of bismuth-layer-structured ferroelectrics (BLSFs) but also presents a viable co-doping strategy to enhance the piezoresponse in CBN ceramics. This strategy could pave the way for the development of highperformance, high-temperature vibration sensors and potentially lead to the discovery of more novel BLSFs with superior performance.
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Bismuth layer structured ferroelectrics,Calcium bismuth niobate,Piezoelectric coefficient,Pseudo phase boundary,Electrical resistivity
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要点】:通过在CaBi2Nb2O9中共同掺杂Ce3+和Mn4+,成功诱导出伪四方畸变,从而显著提高材料的压电响应性能。

方法】:研究采用离子掺杂方法,将Ce3+和Mn4+离子引入CBN结构中,改变其内部层间相互作用,增强压电和铁电性质。

实验】:在纯CaBi2Nb2O9陶瓷和Ce3+、Mn4+共掺杂的CaBi1.96Ce0.04Nb1.985Mn0.015O9陶瓷上进行了性能测试,实验数据表明共掺杂后,材料的压电系数(d33)从6.8 pC/N提升至15.9 pC/N,剩余极化(Pr)从3.83 mu C/cm2提升至20.78 mu C/cm2。数据集名称未在文中明确提及。