Perovskite-type oxides with the general formula ABO3 have attracted considerable attention as prospective electrolyte and electrode materials in solid oxide fuel cells (SOFCs), oxygen separation membranes, and electrochemical sensors due to their structural versatility and tunable ionic transport properties. In this study, three representative lanthanum-based perovskite compositions-La0.8Sr0.2MnO3, La0.7Sr0.3CoO3, and LaFeO3-were synthesized via conventional high-temperature solid-state reaction. Phase purity was confirmed by X-ray diffraction (XRD) analysis, and microstructural characterization was performed using scanning electron microscopy (SEM). Ionic conductivity was evaluated over the temperature range of 600–1000 K using electrochemical impedance spectroscopy (EIS). Activation energies derived from Arrhenius analysis ranged from 0.55 to 0.82 eV, with La0.7Sr0.3CoO3 exhibiting the highest conductivity of 3.8 × 10-2 S cm-1 at 900 K. The influence of A-site Sr2+ substitution on oxygen vacancy concentration and consequent ionic transport is discussed in the framework of defect chemistry and Goldschmidt tolerance factor analysis. These findings underscore the potential of Sr-doped lanthanum perovskites as high-performance solid electrolytes for intermediate-temperature energy conversion devices.
perovskite oxides; solid-state synthesis; ionic conductivity; electrochemical impedance spectroscopy; solid oxide fuel cells; oxygen vacancies; Arrhenius analysis.
International Journal of Trend in Scientific Research and Development - IJTSRD having
online ISSN 2456-6470. IJTSRD is a leading Open Access, Peer-Reviewed International
Journal which provides rapid publication of your research articles and aims to promote
the theory and practice along with knowledge sharing between researchers, developers,
engineers, students, and practitioners working in and around the world in many areas
like Sciences, Technology, Innovation, Engineering, Agriculture, Management and
many more and it is recommended by all Universities, review articles and short communications
in all subjects. IJTSRD running an International Journal who are proving quality
publication of peer reviewed and refereed international journals from diverse fields
that emphasizes new research, development and their applications. IJTSRD provides
an online access to exchange your research work, technical notes & surveying results
among professionals throughout the world in e-journals. IJTSRD is a fastest growing
and dynamic professional organization. The aim of this organization is to provide
access not only to world class research resources, but through its professionals
aim to bring in a significant transformation in the real of open access journals
and online publishing.