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5. Manipulating Multiple Order Parameters via Oxygen Vacancies: The case of Eu0.5Ba0.5TiO3-{\delta}

Author

Li, Weiwei, He, Qian, Wang, Le, Zeng, Huizhong, Bowlan, John, Ling, Langsheng, Yarotski, Dmitry A., Zhang, Wenrui, Zhao, Run, Dai, Jiahong, Gu, Junxing, Shen, Shipeng, Guo, Haizhong, Pi, Li, Wang, Haiyan, Wang, Yongqiang, Velasco-Davalos, Ivan A., Wu, Yangjiang, Hu, Zhijun, Chen, Bin, Li, Run-Wei, Sun, Young, Jin, Kuijuan, Zhang, Yuheng, Chen, Hou-Tong, Ju, Sheng, Ruediger, Andreas, Shi, Daning, Borisevich, Albina Y., and Yang, Hao

Subjects
Condensed Matter - Materials Science
Abstract

Controlling functionalities, such as magnetism or ferroelectricity, by means of oxygen vacancies (VO) is a key issue for the future development of transition metal oxides. Progress in this field is currently addressed through VO variations and their impact on mainly one order parameter. Here we reveal a new mechanism for tuning both magnetism and ferroelectricity simultaneously by using VO. Combined experimental and density-functional theory studies of Eu0.5Ba0.5TiO3-{\delta}, we demonstrate that oxygen vacancies create Ti3+ 3d1 defect states, mediating the ferromagnetic coupling between the localized Eu 4f7 spins, and increase an off-center displacement of Ti ions, enhancing the ferroelectric Curie temperature. The dual function of Ti sites also promises a magnetoelectric coupling in the Eu0.5Ba0.5TiO3-{\delta}., Comment: Accepted by Physical Review B, 2017

Published
2017
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6. Rational design of versatile 1D Ti–O-based core–shell nanostructures for efficient pollutant removal and solar fuel production.

Author

Wang, Qiang, Zhan, Xiaoqiang, Fan, Chenming, Yang, Xiaofan, Li, Bing, Liu, Hong, Wu, Yangjiang, Zhang, Kaihuan, and Tang, Pengyi

Abstract

The rational design of Ti–O-based nanocomposites is of great importance for achieving efficient solar energy conversion and storage. Herein, novel one-dimensional (1D) K2Ti6O13/TiO2 core–shell nanobelt composites were fabricated by a controlled hydrothermal method using 1D K2Ti6O13 nanobelts as precursors. The K2Ti6O13 derived TiO2 shells with a thickness of 5 nm were in situ grown on the K2Ti6O13 NBs with closely connected interfaces, which resulted in remarkably enhanced photoactivities for pollutant degradation, hydrogen production and CO2 reduction. Interestingly, the porous carbon paper supported K2Ti6O13/TiO2 nanocomposites could be used for efficient water purification via synergistic adsorption and photothermal catalysis. Moreover, such a 1D conformal core–shell nanobelt photoanode also showed higher photoelectrochemical water-splitting performance than pure K2Ti6O13, and impressively the significantly accelerated and stable H2 production was achieved due to the thermodynamically favorable glycerol oxidation reaction. Importantly, the high value-added formate was produced along with cathodic H2 generation, revealing a sustainable way for concurrent solar hydrogen generation and green biomass upgrading. It was demonstrated that the enhanced photoactivities of K2Ti6O13/TiO2 nanocomposites could be mainly attributed to their higher light absorption, increased surface reactive sites and especially the promoted charge separation over the S-scheme heterojunction. This work paves a new avenue to rationally design versatile and high-performance Ti–O-based nanostructure photocatalysts for environmental remediation and solar fuel production. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Abnormal topological domains in a high-density array of ferroelectric nanodots.

Author

Li, Zhongwen, Bo, Rui, Shen, Hui, Lin, Yi, Song, Guang, Wang, Yanzong, Li, Guannan, Nan, Feng, Wang, Chao, Wu, Yangjiang, Zhang, Zhengzhong, and Liu, Hao

Subjects
PIEZORESPONSE force microscopy, ELECTRIC switchgear, ELECTRIC fields, NANODOTS
Abstract

Utilizing vector PFM (piezoresponse force microscopy) on high-density nanodot arrays, ferroelectric nanodots and domain structure in nanodot arrays were investigated in the current study. Accordingly, we identified four types of topological domain states based on the measurements of spontaneous polarization vectors vs writing results in nanodots. In addition to convergent and divergent domains with upward and downward polarization, double-center domains and triple-center domains were also identified. In addition, center domains could be reversibly switched under the electric field produced by the biased PFM tip, and their stability could be maintained by compensating the polarization charge with the accumulated charge. These stable topological domain states in discrete nanodots present an opportunity to further investigate their new properties in high-density memory devices. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Manipulating multiple order parameters via oxygen vacancies: The case of Eu0.5Ba0.5TiO3−δ

Author

Li, Weiwei, He, Qian, Wang, Le, Zeng, Huizhong, Bowlan, John, Ling, Langsheng, Yarotski, Dmitry A., Zhang, Wenrui, Zhao, Run, Dai, Jiahong, Gu, Junxing, Shen, Shipeng, Guo, Haizhong, Pi, Li, Wang, Haiyan, Wang, Yongqiang, Velasco-Davalos, Ivan A., Wu, Yangjiang, Hu, Zhijun, Chen, Bin, Li, Run-Wei, Sun, Young, Jin, Kuijuan, Zhang, Yuheng, Chen, Hou-Tong, Ju, Sheng, Ruediger, Andreas, Shi, Daning, Borisevich, Albina Y., and Yang, Hao

Published
2017

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