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Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti1.9Ru0.1O7 ceramics were successfully synthesized by conventional solid-state reaction method. Two strongest diffraction peaks located around 2θ = 33° shifted towards the lower angle region with Ru substitution, reflecting structure variation. Grain growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field about 20 kV/cm. Optical bandgap estimated by UV-vis diffuse reflectance (DR) spectrum and X-ray photoelectron spectroscopy (XPS) valence band spectra showed a decreasing trend due to the existence of impurity energy level upon Ru doping, which was consistent with the results of first-principles calculations. The origin of the unexpected induced magnetic moments in Ru-dope Ca3Ti2O7 is also discussed.


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Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7

Show Author's information Xingxing WUaShouyu WANGb( )Winnie WONG-NGcQiang GUaYao JIANGaChao WANGaShuang MAbWeifang LIUa( )
Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, School of Science, Tianjin University, Tianjin 300072, China
College of Physics and Material Science, Tianjin Normal University, Tianjin 300074, China
Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Abstract

Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti1.9Ru0.1O7 ceramics were successfully synthesized by conventional solid-state reaction method. Two strongest diffraction peaks located around 2θ = 33° shifted towards the lower angle region with Ru substitution, reflecting structure variation. Grain growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field about 20 kV/cm. Optical bandgap estimated by UV-vis diffuse reflectance (DR) spectrum and X-ray photoelectron spectroscopy (XPS) valence band spectra showed a decreasing trend due to the existence of impurity energy level upon Ru doping, which was consistent with the results of first-principles calculations. The origin of the unexpected induced magnetic moments in Ru-dope Ca3Ti2O7 is also discussed.

Keywords:

oxides, electronic materials, optical properties, X-ray diffraction, defects, lectronic structure, ferroelectricity
Received: 07 March 2020 Revised: 05 September 2020 Accepted: 09 September 2020 Published: 28 November 2020 Issue date: February 2021
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Publication history

Received: 07 March 2020
Revised: 05 September 2020
Accepted: 09 September 2020
Published: 28 November 2020
Issue date: February 2021

Copyright

© The Author(s) 2020

Acknowledgements

This work was funded by the National Natural Science Foundation of China (51572193), and the Natural Science Foundation of Tianjin (20JCZDJC00210).

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