Effect of sintering temperature and Sr/Ti ratio on the nature of Mn-ion speciation within SrTiO3-based compounds
Abstract Manganese-doped (Mn/Ti = 0.02/0.98) SrTiO 3 -based materials with various Sr/Ti mole ratios (1.02, 1.00, 0.97 and 0.92) were obtained by the citrate precursor method. The materials were characterised in terms of microstructure (SEM), structure (XRD, XANES), electrical properties (DC method) and reducibility (TPR). With the introduction of 2 mol.% Mn, the cubic structure of SrTiO 3 is preserved, but significantly limits (from Sr/Ti ≥ 0.8 to Sr/Ti > 0.92) the possibilities of deviations from stoichiometry at 1200°C. The narrowing of the stability limit of the perovskite structure to Sr/Ti > 0.97 with an increase in temperature to 1400°C and segregation of Ti-Mn-enrich species are shown. The location and the oxidation states of Mn in both (Sr and Ti) sublattices depend on the assumed Sr/Ti ratio and sintering temperature. Regardless of the Sr/Ti ratio, Mn-doped SrTiO 3 exhibits very low electrical conductivity with an ionic conductivity mechanism. Graphical abstract
Authors
- Ewa Drożdż (ORCID: https://orcid.org/0000-0003-2706-2503)
- Agnieszka Łącz (ORCID: https://orcid.org/0000-0002-6986-2536)
- Paulina Gwóźdź (ORCID: https://orcid.org/0000-0002-0863-3537)
- Joanna Stępień (ORCID: https://orcid.org/0000-0002-1547-1097)
- Monika Mielniczuk
Institutions
- Jagiellonian University (PL)
- Paul Scherrer Institute (CH)
- ETH Zurich (CH)
- Institute for Biomedical Engineering (CH)
- Bioengineering (Switzerland) (CH)
- AGH University of Krakow (PL)
Publication Details
- Journal
- Ionics
- Published
- 2024-12-03
- DOI
- https://doi.org/10.1007/s11581-024-05966-8
- Citations
- 1
- Primary Topic
- Ferroelectric and Piezoelectric Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.12