Abstract
Layered perovskite Ca2.91Na0.09Ti2-xRhxO7 (x = 0.00, 0.02, 0.04, 0.06) were synthesized by a conventional solid-state reaction. Room temperature ferroelectricity has been confirmed. The remanent polarization increases with an increase of Rh content, which is due to a larger oxygen octahedral distortion by Rh doping. The coercive field increases with Rh doping as the pinning effect of oxygen vacancies reduce the mobility of domain wall. Remanent polarization and coercive field are caused by different mechanisms, so it is possible to modulate them independently to meet the requirement of application in ferroelectric field. The concentration of oxygen vacancy increased with Rh doping, leading to the significant increase of leakage current density. The bandgap of samples doped with Rh drastically decrease and the visible light response of the sample was improved by Rh doping due to the formation of impurity energy levels within the band gap.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Notes
The purpose of identifying the equipment and software in this article is to specify the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology.
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The authors are grateful to Dr. Wei Zhou for helpful discussions. This work was funded by the National Natural Science Foundation of China (51572193), and Natural Science Foundation of Tianjin (20JCZDJC00210).
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Gu, Q., Liu, W.F., Wong-Ng, W. et al. Modulation on the electrical and optical properties of Na and Rh co-doped Ruddlesden-Popper layered Ca3Ti2O7. J Electroceram 47, 42–50 (2021). https://doi.org/10.1007/s10832-021-00261-8
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DOI: https://doi.org/10.1007/s10832-021-00261-8