Abstract
Modulating the oxygen defect concentration has been accepted as an effective method to obtain high catalytic activity in perovskite cobaltites. However, controllably modifying the oxygen vacancy is still a challenge in this type of materials, which strongly obstructs their application. Here, we report a successful oxygen vacancies modulation in the La0.7Sr0.3CoO3 (LSCO) film by using combined current effect and temperature cycling. The temperature dependent transport properties of the LSCO/LAO film were investigated. The results revealed that the resistance of the film keeps increasing under the repeated measurements. It was found that the accumulation of the oxygen vacancy by current effect transforms the Co4+ ion into Co3+ ion, which results in the enhancement of the resistance and thus the transport switching behavior. Moreover, the resistance in the cooling process was found to be much higher than that in previous cooling and heating processes, which indicates that the oxygen escapes more quickly in the high temperature region. On the other hand, our analysis indicates that the CoO6 distortion may contribute to the switching of transport behaviors in the low temperature region. Our work provides an effective and controllable way to modulate oxygen defect in the perovskite-type oxides.
Highlights
It has attracted a lot of interests to induce novel electronic, magnetic and structural properties in transition-metal oxides and their interfaces by introducing and modulating oxygen defects.[1,2]
Owing to the high ionic and electronic conductivity, the oxygen-deficient perovskite oxides can be exploited in many applications such as gas sensors, oxygen separation membranes, oxidation catalysts and electrode materials for solid oxide fuel cells.[3,4,5,6]
We report a new avenue to modulate the oxygen vacancies in La0.7Sr0.3CoO3 (LSCO) film by means of temperature cycling assisted with pulsed electric current
Summary
It has attracted a lot of interests to induce novel electronic, magnetic and structural properties in transition-metal oxides and their interfaces by introducing and modulating oxygen defects.[1,2]. The modulation of oxygen vacancies by the combined current effect and temperature cycling in La0.7Sr0.3CoO3 film The results reveal that the resistance of the LSCO/LAO film increases continuously under repeated transport measurements below room temperature.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
