Tuning of the oxygen vacancies in LaCoO3films at the atomic scale

Qichang An; Zhe Xu; Zhenzhen Wang; Meng Meng; Mengxue Guan; Sheng Meng; Xuetao Zhu; Haizhong Guo; Fang Yang; Jiandong Guo

doi:10.1063/5.0043873

Tuning of the oxygen vacancies in LaCoO₃films at the atomic scale

Qichang An, Zhe Xu, Zhenzhen Wang, Meng Meng, Mengxue Guan, Sheng Meng, Xuetao Zhu, Haizhong Guo, Fang Yang^*, Jiandong Guo

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Oxygen vacancies (Vo) play significant roles in determining the properties of transition-metal oxides. However, the concentration of Vo cannot be tuned quantitatively by optimizing the preparation conditions, and the precise control of Vo distribution at the atomic scale is even more challenging. Here, by controlling the reversible phase transitions between perovskite LaCoO3 (PV-LCO) and brownmillerite LaCoO2.5, we realize the tuning of Vo in PV-LCO, including the concentration with quantitative precision and the spatial distribution at the atomic scale. With the first principles calculations, we clarify that two thirds of Vo in PV-LCO can be eliminated after a cycle of the reversible phase transitions, and all the residual Vo are confined in specific lattice sites in PV-LCO. Such an ordered distribution of Vo can help to enhance the ferromagnetism of PV-LCO.

Original language	English
Article number	081602
Journal	Applied Physics Letters
Volume	118
Issue number	8
DOIs	https://doi.org/10.1063/5.0043873
Publication status	Published - 22 Feb 2021
Externally published	Yes

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An, Q., Xu, Z., Wang, Z., Meng, M., Guan, M., Meng, S., Zhu, X., Guo, H., Yang, F., & Guo, J. (2021). Tuning of the oxygen vacancies in LaCoO₃films at the atomic scale. Applied Physics Letters, 118(8), Article 081602. https://doi.org/10.1063/5.0043873

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abstract = "Oxygen vacancies (Vo) play significant roles in determining the properties of transition-metal oxides. However, the concentration of Vo cannot be tuned quantitatively by optimizing the preparation conditions, and the precise control of Vo distribution at the atomic scale is even more challenging. Here, by controlling the reversible phase transitions between perovskite LaCoO3 (PV-LCO) and brownmillerite LaCoO2.5, we realize the tuning of Vo in PV-LCO, including the concentration with quantitative precision and the spatial distribution at the atomic scale. With the first principles calculations, we clarify that two thirds of Vo in PV-LCO can be eliminated after a cycle of the reversible phase transitions, and all the residual Vo are confined in specific lattice sites in PV-LCO. Such an ordered distribution of Vo can help to enhance the ferromagnetism of PV-LCO.",

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AU - An, Qichang

AU - Xu, Zhe

AU - Wang, Zhenzhen

AU - Meng, Meng

AU - Guan, Mengxue

AU - Meng, Sheng

AU - Zhu, Xuetao

AU - Guo, Haizhong

AU - Yang, Fang

AU - Guo, Jiandong

PY - 2021/2/22

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N2 - Oxygen vacancies (Vo) play significant roles in determining the properties of transition-metal oxides. However, the concentration of Vo cannot be tuned quantitatively by optimizing the preparation conditions, and the precise control of Vo distribution at the atomic scale is even more challenging. Here, by controlling the reversible phase transitions between perovskite LaCoO3 (PV-LCO) and brownmillerite LaCoO2.5, we realize the tuning of Vo in PV-LCO, including the concentration with quantitative precision and the spatial distribution at the atomic scale. With the first principles calculations, we clarify that two thirds of Vo in PV-LCO can be eliminated after a cycle of the reversible phase transitions, and all the residual Vo are confined in specific lattice sites in PV-LCO. Such an ordered distribution of Vo can help to enhance the ferromagnetism of PV-LCO.

AB - Oxygen vacancies (Vo) play significant roles in determining the properties of transition-metal oxides. However, the concentration of Vo cannot be tuned quantitatively by optimizing the preparation conditions, and the precise control of Vo distribution at the atomic scale is even more challenging. Here, by controlling the reversible phase transitions between perovskite LaCoO3 (PV-LCO) and brownmillerite LaCoO2.5, we realize the tuning of Vo in PV-LCO, including the concentration with quantitative precision and the spatial distribution at the atomic scale. With the first principles calculations, we clarify that two thirds of Vo in PV-LCO can be eliminated after a cycle of the reversible phase transitions, and all the residual Vo are confined in specific lattice sites in PV-LCO. Such an ordered distribution of Vo can help to enhance the ferromagnetism of PV-LCO.

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Tuning of the oxygen vacancies in LaCoO₃films at the atomic scale

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