Abstract
LaSr3Fe3-xMnxO10-δ (x=0.0-0.8) mixed conductors with layered perovskite structure were prepared via citric acid method. XRD analysis showed that the cell volume decreased with Mn content. The fraction of Fe4+ concentration to the concentration of tetravalent ions decreased with the increase of Mn content. The decrease of average valence state (VB) of transition metals of LaSr3Fe3-xMnxO10-δ samples with the increase of temperature gave rise to the drop of p type charge carriers and the increase of oxygen vacancies. According to the relationship between VB and the numbers of the configurations of transition metals in LaSr3Fe3-xMnxO10-δ , the possible filling states of 3d orbitals of Fe and Mn ions at 700 °C and 800 °C were given. The variations of conductivities of LaSr3Fe3-xMnxO10-δ samples were interpreted on the basis of the variation of VB and δ with temperature and Mn content, respectively. Scanning Kelvin probe measurement results revealed that the surface potential of x=0.6 sample was the highest while x=0.8 sample was the lowest. The higher the surface potential, the higher the energy needed for an electron to be released from the sample.
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.
