journal article·2020-05-13

Nanoscale Phase Mixture and Multifield-Induced Topotactic Phase Transformation in SrFeOx

Junjiang Tian, Yang Zhang, Zhen Fan, Haijun Wu, Lei Zhao, Jingjing Rao, Zuhuang Chen, Haizhong Guo, Xubing Lu, Guofu Zhou, Stephen J. Pennycook, Xingsen Gao, Jun-Ming Liu

ACS Applied Materials & Interfaces· Volume 12· Issue 19
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Abstract

Nanoscale phase mixtures in transition-metal oxides (TMOs) often render these materials susceptible to external stimuli (electric field, mechanical stress, etc.), which can lead to rich functional properties and device applications. Here, direct observation and multifield manipulation of a nanoscale mixture of brownmillerite SrFeO2.5 (BM-SFO) and perovskite SrFeO3 (PV-SFO) phases in SrFeOx (SFO) epitaxial thin films are reported. The mixed-phase SFO film in its pristine state exhibits a nanoscaffold structure consisting of PV-SFO nanodomains embedded in the BM-SFO matrix. This nanoscaffold structure produces gridlike patterns in the current and electrochemical strain maps, owing to the strikingly different electrical and electrochemical properties of BM-SFO and PV-SFO. Moreover, electric field control of reversible topotactic phase transformation between BM-SFO and PV-SFO is demonstrated by electric-field-induced reversible changes in surface height, conductance, and electrochemical strain response. In addition, it is also shown that the BM-SFO → PV-SFO phase transformation can be enabled by applying mechanical stress. This study therefore not only identifies a strong nanometric structure–property correlation in the mixed-phase SFO but also offers a new paradigm for the multifield control of topotactic phase transformation.
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Research context

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

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

Affiliations

Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China

Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore

Instrumental Analysis Center of Xi’an Jiaotong University, Xi’an Jiaotong University, Xi’an 710049, China

State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China

School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, China

National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China

Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Funding

State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Ministry of Education - Singapore · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Higher Education Discipline Innovation Project · Guangdong Province · Key Laboratory of Optical Information Materials and Technology, South China Normal University · MOE International Laboratory for Optical Information Technologies

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