The defect and dielectric properties of Nb and Mn co-doping BaTiO₃ ceramics

abstract

The effect of Nb and Mn as dopants on the dielectric properties of BaTiO₃ based ceramics was investigated. When the content of Nb <1.0% mol (Mn =1.6% mol), a diffuse phase transition (DFT) character appeared, and a normal-like ferroelectrics character was observed as the content of Nb is 1.0% mol. When the content of Nb increases up to 1.1% mol, it showed a dielectric relaxation. The binding energy for different defect associations [$2N{b}_{Ti}^{•}+V_{Ba}^{″}$] and [$V_O^{••}+2M{n}_{Ti}^{\prime }$] calculated using computer simulation techniques and the dielectric properties related to polar nanoregions (PNRs) were discussed.

Keywords:

• BaTiO₃ ceramics
• defects
• dielectric relaxation
• PNRs

Funding

The work was supported by the Chunhui Project of the Education Ministry of China [grant number Z2011077]; the National Natural Science Foundation of China [grant numbers 11074203, 51279172]; the Project of Sichuan Provincial Department of Education [grant number 14ZB0126].