journal article·2018-02-01Open access

Phase competition in the growth of SrCoOx/LaAlO3 thin films

Jie Zhang, Dechao Meng, Haoliang Huang, Honglei Cai, Qiuping Huang, Jianlin Wang, Yuanjun Yang, Xiaofang Zhai, Zhengping Fu, Yalin Lu

AIP Advances· Volume 8· Issue 2

Abstract

The reversible topotactic phase transformation between brownmillerite SrCoO2.5 to perovskite SrCoO3 has attracted more and more attention for potential applications as solid oxide fuels and electrolysis cells. However, the relatively easy transformation result from small thermal stable energy barriers between the two phases leads to unstable the structures. In the paper, amounts of SrCoO3-δ films have been prepared by pulsed laser deposition at optimized growth conditions with the temperature range of 590-720°C. The X-ray diffraction (XRD) results demonstrated that a phase competition emerged around 650°C. The Gibbs free energies of two phases at high temperature revealed the difference of stability of these two phases under different growth temperature. The optical spectroscopies and X-ray photoelectron spectroscopies were used to verify the electronic structure and chemical state differences between the two phases with distinct crystal structures.
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Research context

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides · Advancements in Solid Oxide Fuel Cells

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

Affiliations

Quantum Materials & Photonic Technology Laboratory, & Hefei National Laboratory for Physical Sciences at the Microscale, & National Synchrotron Radiation Laboratory, & Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China 1 , Hefei 230026, P. R. China

Microsystem and Terahertz Research Center, CAEP 2 , Chengdu 610200, P. R. China

CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China 3 , Hefei 230026, P. R. China

School of Electronic Science and Applied Physics, and Lab of Quantum Materials and Interfaces, Hefei University of Technology 4 , Hefei, Anhui 230009, P. R. China

Funding

Hefei Science Center CAS · National Key R&D Program of China

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