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Structural Properties and Water Uptake of SrTi1−xFexO3−x/2−δ

Abstract

In this work, Fe-doped strontium titanate SrTi1−xFexO3−x/2−δ, for x = 0–1 (STFx), has been fabricated and studied. The structure and microstructure analysis showed that the Fe amount in SrTi1−xFexO3−x/2−δ has a great influence on the lattice parameter and microstructure, including the porosity and grain size. Oxygen nonstoichiometry studies performed by thermogravimetry at different atmospheres showed that the Fe-rich compositions (x > 0.3) exhibit higher oxygen vacancies concentration of the order of magnitude 1022–1023 cm−3. The proton uptake investigations have been done using thermogravimetry in wet conditions, and the results showed that the compositions with x < 0.5 exhibit hydrogenation redox reactions. Proton concentration at 400 °C depends on the Fe content and was estimated to be 1.0 × 10−2 mol/mol for SrTi0.9Fe0.1O2.95 and 1.8 × 10−5 mol/mol for SrTi0.5Fe0.5O2.75. Above 20 mol% of iron content, a significant drop of proton molar concentrations at 400 °C was observed. This is related to the stronger overlapping of Fe and O orbitals after reaching the percolation level of approximately 30 mol% of the iron in SrTi1−xFexO3−x/2−δ. The relation between the proton concentration and Fe dopant content has been discussed in relation to the B-site average electronegativity, oxygen nonstoichiometry, and electronic structure.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
Materials no. 13, pages 1 - 15,
ISSN: 1996-1944
Language:
English
Publication year:
2020
Bibliographic description:
Miruszewski T., Dzierzgowski K., Winiarz P., Wachowski S., Mielewczyk-Gryń A., Gazda M.: Structural Properties and Water Uptake of SrTi1−xFexO3−x/2−δ// Materials -Vol. 13,iss. 4 (2020), s.1-15
DOI:
Digital Object Identifier (open in new tab) 10.3390/ma13040965
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