Dielectric and magnetic response of mechanically activated Mn-doped SrTiO3 ceramics

• Published in: Ceramics international 2024-09, Vol.50 (18), p.31896-31904
• Main Authors: Živojinović, J., Kosanović, D., Blagojević, V.A., Tadić, A. Peleš, Pavlović, V.P., Tadić, N.
• Format: Article
• Language: English
• Subjects: Magnetization; Mechanical activation; Mn-doped SrTiO3; Permittivity; Sintering
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2024.05.487

This research was focused on the influence of manganese (Mn) incorporation at Sr and/or Ti sites on the microstructure, relative dielectric permittivity and specific magnetization of strontium titanate (SrTiO3) ceramics. A solid-state method was used for the preparation of mechanically activated (10, 30 and 120 min) Mn-doped SrTiO3 ceramics with various manganese dioxide (MnO2) weight percentages (1.5, 3 and 6 wt%). Rietveld's analysis showed that the mean crystallite size in doped-activated SrTiO3 ceramics is smaller than in undoped ceramics, which is a consequence of additional crystal structure distortion due to ion substitution. Changes in the Raman spectra indicated dopant incorporation in the SrTiO3 lattice. The microstructural analysis pointed out a decrease in the mean grain size with increasing dopant concentration and time of activation. The highest values of permittivity and magnetization were observed for Mn-doped SrTiO3 ceramic mechanically activated for 120 min. Based on all the above, the optimal electrical and magnetic properties of SrTiO3 ceramics can be achieved by the appropriate choice of mechanical activation time and dopant concentration.