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Research Article | Open Access

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

Xingxing WUa, Shouyu WANGb( ), Winnie WONG-NGc, Qiang GUa, Yao JIANGa, Chao WANGa, Shuang MAb, Weifang 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
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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

oxideselectronic materialsoptical propertiesX-ray diffractiondefectslectronic structureferroelectricity

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Journal of Advanced Ceramics
Volume 10 Issue 1,
February 2021
Pages 120-128
DOI: 10.1007/s40145-020-0425-2
Cite this article:
WU X, WANG S, WONG-NG W, et al. Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7. Journal of Advanced Ceramics, 2021, 10(1): 120-128. https://doi.org/10.1007/s40145-020-0425-2

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Received: 07 March 2020
Revised: 05 September 2020
Accepted: 09 September 2020
Published: 28 November 2020
© The Author(s) 2020

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