Barium strontium titanium oxide

Name:Barium Strontium Titanate
CAS NO.:12430-73-8

Purity：≥99.5%
D50 particle size:<3um
Cl:<0.05 wt%
Na2O+K2O:<0.05 wt%
S2+:<0.05 wt%
H2O:<0.5 wt%
Ignition loss:<1.0 wt%

Main application fields:
Electronic ceramics, fine ceramics, ceramic capacitors, microwave components, structural ceramics, etc.

Barium strontium titanate is obtained by solid-state reaction of barium titanate (BaTiO3) and strontium titanate (SrTiO3) at high temperature, and it is an infinite solid solution of BaTiO3 and SrTiO3. BaTiO3 _ 3 crystal is in a highly polarized state and has a high dielectric constant under the interaction of ion displacement polarization and electron displacement polarization. But BaTiO3 _ 3 has a significant dependence on temperature. As a new multifunctional ceramic material, SrTiO3 _ 3 has better temperature stability and lower dielectric loss (10-3-10-4) compared with BaTiO _ 3, but its dielectric constant (225-250) is much different from BaTiO _ 3 (2 х 103-104). In order to overcome the respective shortcomings of the two materials, Ba is usually partially replaced by Sr to form BaxSr1-xTiO3 system materials, and capacitor ceramic materials that meet the performance requirements can be obtained by adjusting the X value.

The structure of barium strontium titanate (BaxSr1-xTiO3) is similar to that of barium titanate, and it is also a typical perovskite phase structure, except that Sr2+ partially replaces Ba2+. The larger Ba2+ and Sr2+ occupy the top corner, the smaller Ti4+ occupies the center of the body, and the six face centers are occupied by O2-. These oxygen ions form an oxygen octahedron with Ti4+ at its center. The whole crystal can be regarded as being connected by the same vertex of oxygen octahedrons, and the gaps between each oxygen octahedron are occupied by Ba2+/Sr2+, so the coordination numbers of Ba2+/Sr2+ and Ti4+ are 12 and 6 respectively.