Perovskites ceramics
The perovskites constitute a big family of crystalline materials of formula ABO3 with:
- A : atom charged +2
- B : atom charged +4
The atom multiplicity can integrate sites A and B being numerous, there is a large number of materials said perovskite structure.
- Site A: Ca2+,Ba2+,Pb2+,Sr2+
- Site : Ti4+,Mn4+,Pt4+...
The most known perovskites like BaTiO3, CaTiO3, SrTiO3 or (PbSr)TiO3 are mainly used as dielectric for manufacturing of multi-layers condensators, thermistor, transducers, temperature sensors…
| BaTiO 3 | CaTiO 3 | SrTiO 3 | PbTiO 3 | (PbSr)TiO 3 PZT | |
|---|---|---|---|---|---|
| Physical properties | |||||
| Density (g/cm 3) | 5,5 | 4,1 | 5,12 | 12,8 | 7,55 |
| Mechanical properties | |||||
| Flexural strength (MPa) | 20-50 | - | - | - | 40-85 |
| Electrical properties | |||||
| Dielectric constant | 500-1500 | - | 300 | 270 | 1350-1470 |
| Curie temperature (°C) | 115-140 | - | - | 240 | 300 |