Abstract
Transition metal oxides (TMOs), as one of the advanced materials, have been widely studied due to their unique electronic, magnetic, optical, and thermal transport properties. Among them, SrCoOx (SCOx) is known as an oxygen sponge, where the ordered one-dimensional oxygen vacancy channels in the structure can work as the pathway for hydrogen/oxygen ions migration, facilitating the modulation of oxygen stoichiometry through the topotactic redox reaction. In this way, a “multi-state” phases transition with tunable physical properties can be realized. In this review, we summarize recent research progress in the utilization of H+ and O2 ions to induce distinct phase transitions in SCOx, which result in obvious physical property changes. The ability to control the properties of SCOx over a wide range through the incorporation of ionic defects provides a promising route for the development of advanced functional devices.
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