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Optical and electrical properties in Na and Rh co-doped Ruddlesden-Popper layered Ca3Ti2O7



Qiang Gu, Weifang Liu, Winnie Wong-Ng, Xingxing Wu, Yao Jiang, Chao Wang, Shuang Ma, Shouyu Wang


Layered perovskite Ca2.91Na0.09Ti2-xRhxO7 (x=0.00, 0.02, 0.04, 0.06) were synthesized by a conventional solid-state reaction. The two strongest peaks of XRD shift to the lower 2θ region with an increase of Rh content, demonstrating changing of lattice spacing. Room temperature ferroelectricity has been confirmed and the ferroelectric coercive field increases with an increasing x value. The concentration of oxygen vacancy was found to increase 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. It is anticipated that Ca2.91Na0.09Ti2-xRhxO7 could become a new type of photocatalytic material under visible light irradiation.
Journal of Advanced Ceramics


Ca3Ti2O7, Ferroelectricity, Optical properties, Band gap, First-principles calculations


Gu, Q. , Liu, W. , Wong-Ng, W. , Wu, X. , Jiang, Y. , Wang, C. , Ma, S. and Wang, S. (2020), Optical and electrical properties in Na and Rh co-doped Ruddlesden-Popper layered Ca3Ti2O7, Journal of Advanced Ceramics, [online], (Accessed March 2, 2024)
Created September 9, 2020, Updated September 23, 2022