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
Affiliations
Jie Zhang
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, Hefei 230026, P. R. China
Dechao Meng
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, Hefei 230026, P. R. China
Haoliang Huang
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, Hefei 230026, P. R. China
Honglei Cai
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, Hefei 230026, P. R. China
Qiuping Huang
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, Hefei 230026, P. R. China
Jianlin Wang
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, Hefei 230026, P. R. China
Yuanjun Yang
School of Electronic Science and Applied Physics, and Lab of Quantum Materials and Interfaces, Hefei University of Technology, Hefei, Anhui 230009, P. R. China
Xiaofang Zhai
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, Hefei 230026, P. R. China
Zhengping Fu
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, Hefei 230026, P. R. China
Yalin Lu
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, Hefei 230026, P. R. China
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.
