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Research Article | Open Access

Effect of rare-earth doping on the dielectric property and polarization behavior of antiferroelectric sodium niobate-based ceramics

Jiaming Yea,b, Genshui Wanga,b,c(), Xuefeng Chena, Xianlin Donga,b,c
Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, China

Peer review under responsibility of The Chinese Ceramic Society.

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Highlights

• Effects of single rare-earth doping on the electrical properties of NN-based ceramics.

• Re-entrant-like dielectric characteristics and complex phase transition behaviors with temperature and composition.

• An explanation for the difficulty in enhancing the antiferroelectricity of NN-based materials.

• A relatively high Wre of 2.1 J/cm3 at a low electric field of 250 kV/cm.

Graphical Abstract

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Abstract

The lead-free 0.96NaNbO3-0.04CaSnO3 ceramics with rare-earth dopants (La, Sm and Lu) (NCLn100x) were prepared and characterized. It is found that a certain amount of La substitution stabilizes the antiferroelectric (AFE) phase but alleviates the lattice distortion in the fresh samples. Re-entrant-like characteristics are observed in the temperature – dielectric constant curves with the room temperature P phase gradually replaced by a possible R phase. Relaxor-like hysteresis loops with suppressed hysteresis loss and remanent polarization were obtained at high La content, achieving a relatively high Wre of 2.1 J/cm3 at a low electric field (250 kV/cm). The relaxation behaviors of the ferroelectric (FE) domain measured by piezoresponse force microscopy suggest an even long characteristic relaxation time of field-induced FE phase, which is different from the situations of other AFE perovskites. Via an explanatory defected diatomic chain model, we propose that a much larger mass of substitutive ion than the origin one helps to induce low-frequency localized mode, which is believed to be in favor of the formation of polar nano-regions and hence strengthens the dynamic stability of FE phase during electric field loading. Our research provides a further understanding of the tuning strategy for enhancing the antiferroelectricity of the NaNbO3-based system.

Keywords

CeramicsRare-earth dopingPhase transitionAntiferroelectric

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Journal of Materiomics
Volume 7 Issue 2,
March 2021
Pages 339-346
DOI: 10.1016/j.jmat.2020.08.007
Cite this article:
Ye J, Wang G, Chen X, et al. Effect of rare-earth doping on the dielectric property and polarization behavior of antiferroelectric sodium niobate-based ceramics. Journal of Materiomics, 2021, 7(2): 339-346. https://doi.org/10.1016/j.jmat.2020.08.007
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