DataVXAdvanced MaterialsPaper
journal article·2017-10Open access

Topotactic Metal–Insulator Transition in Epitaxial SrFeOx Thin Films

Amit Khare, Dongwon Shin, Tae Sup Yoo, Minu Kim, Tae Dong Kang, Jaekwang Lee, Seulki Roh, In‐Ho Jung, Jungseek Hwang, Sung Wng Kim, Tae Won Noh, Hiromichi Ohta, Woo Seok Choi

Advanced Materials· Volume 29· Issue 37
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Source abstract

Abstract

Topotactic phase transformation enables structural transition without losing the crystalline symmetry of the parental phase and provides an effective platform for elucidating the redox reaction and oxygen diffusion within transition metal oxides. In addition, it enables tuning of the emergent physical properties of complex oxides, through strong interaction between the lattice and electronic degrees of freedom. In this communication, the electronic structure evolution of SrFeOx epitaxial thin films is identified in real‐time, during the progress of reversible topotactic phase transformation. Using real‐time optical spectroscopy, the phase transition between the two structurally distinct phases (i.e., brownmillerite and perovskite) is quantitatively monitored, and a pressure–temperature phase diagram of the topotactic transformation is constructed for the first time. The transformation at relatively low temperatures is attributed to a markedly small difference in Gibbs free energy compared to the known similar class of materials to date. This study highlights the phase stability and reversibility of SrFeOx thin films, which is highly relevant for energy and environmental applications exploiting the redox reactions.
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Research context

Electronic materials

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Ferroelectric and Piezoelectric Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics Sungkyunkwan University Suwon 16419 South Korea

Center for Integrated Nanostructure Physics Institute for Basic Science Sungkyunkwan University Suwon 16419 South Korea

Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA

Center for Correlated Electron Systems Institute for Basic Science Seoul National University Seoul 08826 South Korea

Department of Physics and Astronomy Seoul National University Seoul 08826 South Korea

Department of Physics Pusan National University Busan 46241 South Korea

Department of Mining and Materials Engineering McGill University Montreal QC H3A 0C5 Canada

Department of Energy Sciences Sungkyunkwan University Suwon 16419 South Korea

Research Institute for Electronic Science Hokkaido University Sapporo 001‐0020 Japan

Funding

Ministry of Science, ICT and Future Planning · National Research Foundation of Korea · Japan Society for the Promotion of Science

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