Barium titanate
- CAS number
- 12047-27-7
- Molecular weight
- 233.20
- Molecular formula / chemical symbol
- BaTiO3
Description
Barium titanate is the inorganic compound with the chemical formula BaTiO3. Barium titanate is a white powder and transparent as larger crystals. This titanate is a ferroelectric ceramic material, with a photorefractive effect and piezoelectric properties.
The solid can exist in five phases, listing from high temperature to low temperature: hexagonal, cubic, tetragonal, orthorhombic, and rhombohedral crystal structure. All of the phases exhibit the ferroelectric effect except the cubic phase. The high temperature cubic phase is easiest to describe, consisting of octahedral TiO6 centres that define a cube with Ti vertices and Ti-O-Ti edges. In the cubic phase, Ba2+ is located at the center of the cube, with a nominal coordination number of 12. Lower symmetry phases are stabilized at lower temperatures, associated with the movement of the Ba2+ to off-center position. The remarkable properties of this material arise from the cooperative behavior of the Ba2+ centres.
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Quality standards
|
|
High-class product |
First grade |
Qualified products |
|
(BaO/TiO2) |
1.000±0.003 |
1.000±0.005 |
1.000±0.001 |
|
(BaTi03) %≥ |
99.9 |
99.5 |
99.0 |
|
(SrO) %≤ |
0.010 |
0.20 |
0.40 |
|
(Na2O) %≤ |
0.005 |
0.02 |
0.10 |
|
(K2O) %≤ |
0.005 |
0.01 |
0.015 |
|
(A12O3) % ≤ |
0.005 |
0.03 |
0.10 |
|
(SiO2)%≤ |
0.005 |
0.03 |
0.10 |
|
(Fe2O3) %≤ |
0.003 |
0.008 |
0.015 |
|
(MgO) %≤ |
0.001 |
0.005 |
0.010 |
|
Average particle size /μm≤ |
1.0 |
1.2 |
1.45 |