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Barium strontium titanate(BST)(BaSrTio3) Powder
MF:BaSrTio3
Appearance: White Powder
Specification:
|
Item |
Unit |
Standard |
Result |
Notice |
|
BaO |
wt% |
36.75~36.85 |
36.81 |
50.01 mol% |
|
SrO |
wt% |
24.85~24.95 |
24.86 |
49.98 mol% |
|
TiO2 |
wt% |
38.30~38.40 |
38.34 |
100.01 mol% |
|
Particle Size
|
μm |
D10=0.1 |
Sinter Temperature: 1342°C(In air) |
|
|
D50=0.2 |
||||
|
Na2O+K2O |
wt% |
<0.1 |
0.005 |
|
|
Fe2O3 |
wt% |
<0.1 |
0.026 |
|
|
H2O |
wt% |
<0.3 |
0.15 |
|
Application:
Barium strontium titanate is through the barium titanate (BaTiO3) and strontium titanate (SrTiO3) high temperature solid instead should be, is SrTiO3 BaTiO3 and the crystallology infinite. BaTiO3 in ion displacement polarization and electronic displacement polarization under the interaction of crystal a highly polarized state, has the high dielectric constant. But for temperature has significant BaTiO3 dependence. SrTiO3 as a new multifunctional BaTiO3 ceramic materials, and has better stability than the lower temperature, dielectric loss Angle (10-3-10-4), but the dielectric constant (225-250) but with BaTiO3 (2 * 103 104) is a lot. In order to overcome the disadvantages of their two materials, usually with Sr, Ba BaxSr1 formed to replace part-xTiO3 system by adjusting the material that can be satisfied value to x the performance requirements of capacitors ceramic material.
Barium titanate structure as shown in figure, barium strontium titanate (BaxSr1-xTiO3) structure and similar, typical also of perovskite phase structure, just Sr2 + partially replaced Ba2 +. Larger Ba2 Sr2 + +, and the position of the Angle of occupied, smaller Ti4 + occupy body the position of the heart, six surfaces by heart is O2-is held. These oxygen ion form oxygen octahedron, Ti4 + in the center. The crystals can be considered by oxygen octahedron were connected to each vertex, oxygen octahedron space between the Ba2 + / Sr2 + occupy, so Ba2 + / Sr2 Ti4 + + and the coordination number 12 and 6 respectively.
