| Doping Mn Induced Modification on the Crystal Structure,
Morphology and Optical Properties of Mechanically
Activated SrTiO3 Powders |
Jelena Živojinovi?,1,* Darko Kosanovi?,1 Vladimir A. Blagojevi?,2 Vera P. Pavlovi?,3 Jovana
?irkovi?4 and Vladimir B. Pavlovi?5
Pages : 102-110
DOI : 10.1080/0371750X.2024.2315956 |
| Abstract |
| Mechanically activated strontium titanate (SrTiO3) powders with various manganese
dioxide (MnO2) doping levels (1.5, 3 and 6 wt%) were prepared by solid state method.
Due to the possibility of manganese ion incorporation in SrTiO3 at Ti4+ and/or Sr2+
sites a detailed analysis of the influence of dopants on the microstructure, morphology
and optical properties of perovskite oxide was conducted. The investigation showed
that manganese was incorporated into the lattice and surface layers of SrTiO3 particles
with the presence of manganese segregation and inhomogeneities. Optical
measurements indicated a shift of the absorption edge to higher values of wavelengths
where the lowest value of the band gap (3.10 eV) was for the longest activation time
(120 min) and the highest weight percentage of dopant (6 wt%). In the case of lower
concentration (1.5 wt%), there was a significant relative contribution of the substitution
of Sr2+ ions by Mn2+ ions, while the substitution of Ti4+ ions by Mn4+ ions dominated
samples with an increased concentration.
[Keywords: Mn-doped SrTiO3 powders, Mechanical activation, Structural and optical
properties] |
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