Abstract
Bi0.5Na0.5TiO3-xBaTiO3(BNT-xBT) nano-powders are successfully synthesized by a modified citrate method. The as-prepared BNT-BT powders and the sintered ceramics are homogeneous with a pure perovskite crystal structure. The effects of Ba2+substitutions for (Bi0.5Na0.5)2+in the A-sites of Bi0.5Na0.5TiO3on its phase transformations are explored. The transformations among ferroelectric (FE), anti-ferroelectric (AFE) and paraelectric (PE) states in these ceramics are characterized using ferroelectric hysteresis tests, modulated differential scanning calorimetry and dynamic mechanical analysis. The FE-AFE transition in BNT-xBT with 0≤x≤0.15 is found to relate with a structural transformation which is a first-order phase transition. The mechanical and thermal analyses provide evidence that AFE state (0≤x≤0.15) could be associated with the incommensurate modulation of rhombohedral structures while the mechanisms of forming AFE state in BNT-xBT (x>0.15) could be different.
| Original language | English |
|---|---|
| Pages (from-to) | 1233-1240 |
| Number of pages | 8 |
| Journal | Ceramics International |
| Volume | 39 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Mar 2013 |
Keywords
- Citrate method
- Elasticity anomaly
- Lead-free ferroelectric ceramics
- Phase transformation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry