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Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites

Author

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  • Hyunmin Kim

    (Ulsan National Institute of Science and Technology (UNIST))

  • Chaesung Lim

    (Pohang University of Science and Technology (POSTECH))

  • Ohhun Kwon

    (University of Pennsylvania)

  • Jinkyung Oh

    (Ulsan National Institute of Science and Technology (UNIST))

  • Matthew T. Curnan

    (Pohang University of Science and Technology (POSTECH))

  • Hu Young Jeong

    (Ulsan National Institute of Science and Technology (UNIST))

  • Sihyuk Choi

    (Kumoh National Institute of Technology)

  • Jeong Woo Han

    (Pohang University of Science and Technology (POSTECH))

  • Guntae Kim

    (Ulsan National Institute of Science and Technology (UNIST))

Abstract

To significantly increase the amount of exsolved particles, the complete phase reconstruction from simple perovskite to Ruddlesden-Popper (R-P) perovskite is greatly desirable. However, a comprehensive understanding of key parameters affecting the phase reconstruction to R-P perovskite is still unexplored. Herein, we propose the Gibbs free energy for oxygen vacancy formation in Pr0.5(Ba/Sr)0.5TO3-δ (T = Mn, Fe, Co, and Ni) as the important factor in determining the type of phase reconstruction. Furthermore, using in-situ temperature & environment-controlled X-ray diffraction measurements, we report the phase diagram and optimum ‘x’ range required for the complete phase reconstruction to R-P perovskite in Pr0.5Ba0.5-xSrxFeO3-δ system. Among the Pr0.5Ba0.5-xSrxFeO3-δ, (Pr0.5Ba0.2Sr0.3)2FeO4+δ – Fe metal demonstrates the smallest size of exsolved Fe metal particles when the phase reconstruction occurs under reducing condition. The exsolved nano-Fe metal particles exhibit high particle density and are well-distributed on the perovskite surface, showing great catalytic activity in fuel cell and syngas production.

Suggested Citation

  • Hyunmin Kim & Chaesung Lim & Ohhun Kwon & Jinkyung Oh & Matthew T. Curnan & Hu Young Jeong & Sihyuk Choi & Jeong Woo Han & Guntae Kim, 2021. "Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26739-1
    DOI: 10.1038/s41467-021-26739-1
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