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Title: Topotactic Metal-Insulator Transition in Epitaxial SrFeO x Thin Films

Multivalent transition metal oxides provide fascinating and rich physics related to oxygen stoichiometry. In particular, the adoptability of various valence states of transition metals enables perovskite oxides to display mixed (oxygen) ionic and electronic conduction and catalytic activity useful in many practical applications, including solid-oxide fuel cells (SOFCs), rechargeable batteries, gas sensors, and memristive devices. For proper realization of the ionic conduction and catalytic activity, it is essential to understand the reversible oxidation and reduction process, which is governed by oxygen storage/release steps in oxides. Topotactic phase transformation facilitates the redox process in perovskites with specific oxygen vacancy ordering by largely varying the oxygen concentration of a material without losing the lattice framework. The concentration and diffusion of oxide ions (O 2–), the valence state of the transition metal cations, and the thermodynamic structural integrity together provide fundamental understanding and ways to explicitly control the redox reaction.[6] In addition, it offers an attractive route for tuning the emergent physical properties of transition metal oxides, via strong coupling between the crystal lattice and electronic structure.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [4] ;  [1] ;  [5] ;  [1] ;  [1] ;  [3] ;  [6] ;  [1]
  1. Sungkyunkwan Univ., Suwon (Republic of Korea)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Seoul National Univ. (Korea, Republic of)
  4. Pusan National Univ., Busan (Korea, Republic of)
  5. McGill Univ., Montreal, QC (Canada)
  6. Hokkaido Univ., Sapporo (Japan)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 37; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1399927

Khare, Amit, Shin, Dongwon, Yoo, Tae Sup, Kim, Minu, Kang, Tae Dong, Lee, Jaekwang, Roh, Seulki, Jung, In-Ho, Hwang, Jungseek, Kim, Sung Wng, Noh, Tae Won, Ohta, Hiromichi, and Choi, Woo Seok. Topotactic Metal-Insulator Transition in Epitaxial SrFeO x Thin Films. United States: N. p., Web. doi:10.1002/adma.201606566.
Khare, Amit, Shin, Dongwon, Yoo, Tae Sup, Kim, Minu, Kang, Tae Dong, Lee, Jaekwang, Roh, Seulki, Jung, In-Ho, Hwang, Jungseek, Kim, Sung Wng, Noh, Tae Won, Ohta, Hiromichi, & Choi, Woo Seok. Topotactic Metal-Insulator Transition in Epitaxial SrFeO x Thin Films. United States. doi:10.1002/adma.201606566.
Khare, Amit, Shin, Dongwon, Yoo, Tae Sup, Kim, Minu, Kang, Tae Dong, Lee, Jaekwang, Roh, Seulki, Jung, In-Ho, Hwang, Jungseek, Kim, Sung Wng, Noh, Tae Won, Ohta, Hiromichi, and Choi, Woo Seok. 2017. "Topotactic Metal-Insulator Transition in Epitaxial SrFeO x Thin Films". United States. doi:10.1002/adma.201606566. https://www.osti.gov/servlets/purl/1399927.
@article{osti_1399927,
title = {Topotactic Metal-Insulator Transition in Epitaxial SrFeO x Thin Films},
author = {Khare, Amit and Shin, Dongwon and Yoo, Tae Sup and Kim, Minu and Kang, Tae Dong and Lee, Jaekwang and Roh, Seulki and Jung, In-Ho and Hwang, Jungseek and Kim, Sung Wng and Noh, Tae Won and Ohta, Hiromichi and Choi, Woo Seok},
abstractNote = {Multivalent transition metal oxides provide fascinating and rich physics related to oxygen stoichiometry. In particular, the adoptability of various valence states of transition metals enables perovskite oxides to display mixed (oxygen) ionic and electronic conduction and catalytic activity useful in many practical applications, including solid-oxide fuel cells (SOFCs), rechargeable batteries, gas sensors, and memristive devices. For proper realization of the ionic conduction and catalytic activity, it is essential to understand the reversible oxidation and reduction process, which is governed by oxygen storage/release steps in oxides. Topotactic phase transformation facilitates the redox process in perovskites with specific oxygen vacancy ordering by largely varying the oxygen concentration of a material without losing the lattice framework. The concentration and diffusion of oxide ions (O2–), the valence state of the transition metal cations, and the thermodynamic structural integrity together provide fundamental understanding and ways to explicitly control the redox reaction.[6] In addition, it offers an attractive route for tuning the emergent physical properties of transition metal oxides, via strong coupling between the crystal lattice and electronic structure.},
doi = {10.1002/adma.201606566},
journal = {Advanced Materials},
number = 37,
volume = 29,
place = {United States},
year = {2017},
month = {7}
}

Works referenced in this record:

Chemical Structures and Performance of Perovskite Oxides
journal, July 2001
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A high-performance cathode for the next generation of solid-oxide fuel cells
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Anisotropic oxygen diffusion at low temperature in perovskite-structure iron oxides
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