Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.141
Publication date: 18th December 2023
Nowadays, the existence of high entropy perovskite oxides is well established and, since their discovery, their fields of application have been continuously studied. The main advantage provided by these types of materials with general formula ABO3 is the high possibility of tuning their properties by acting on the chemical compositions. The study of stability, fields of existence, and solubility limits in a systematic way remains lacking in comparison with continuous application research, despite the presence of large datasets and computational studies.1 In our work, we investigated the structure and solubility limits using a chemometric approach for two families of perovskite oxides with the following compositions: on the site A we chose to keep lanthanum due to its stability, while, on the B site, we explored different cation mixtures based on Cr, Mn, Fe, Co, Ni and Zn, to determine an experimental domain by including various experimental data, i.e. crystal structure, oxygen vacancies amount and temperature-dependance, and composition.2 The synthesized samples were subjected to x-ray diffraction (XRD) analysis followed by Rietveld refinement to determine crystallographic parameters. Through multivariate analysis, elemental concentrations were correlated to phase stability and nature, and cell parameters. The structural study aims at highlight possible correlations between the crystal symmetry and the catalytic characteristics of the material. Finally, through thermogravimetric analysis, it is possible to study non-stoichiometry and phase transitions to be integrated within the previously designated experimental domains.3 The overall dataset will allow to define the best compositions to be used for the desired applications such as heterogeneous catalysis, solid-oxide fuel cells, and oxygen transport membranes.4
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