Barium strontium titanate

Barium strontium titanate

Name: Barium strontium titanate

Other name: barium strontium dititanate(2-) , Barium strontium titanium oxide (BaSrTi2O6); strontium,barium(+2) cation,oxygen(-2) anion,titanium(+4) cation

CAS no. : 12430-73-8; 181256-62-2

EINECS no. : 235-235-5

Formula: BaO4SrTi

Molecular weight: 336.8116

Appearance: White powder

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Uses: high performance requirements of the capacitor ceramic material

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Barium strontium titanate is obtained by solid-state reaction of barium titanate (BaTiO3) and strontium titanate (SrTiO3) at high temperature, and is an infinite solid solution of BaTiO3 and SrTiO3. BaTiO3 has a high dielectric constant in the highly polarized state under the interaction of ion displacement polarization and electron displacement polarization. However, BaTiO3 has a significant dependence on temperature. SrTiO3 as a new multi-functional ceramic material, compared with BaTiO3 has better temperature stability, lower dielectric loss (10-3-10-4), but the dielectric constant (225-250) and BaTiO3 (2х103-104) is much different. In order to overcome the shortcomings of the two materials, usually with Sr part of the substitution of Ba, the formation of BaxSr1-xTiO3 system material, by adjusting the value of x to meet the performance requirements of the capacitor ceramic material. Barium titanate structure As shown in the figure, barium strontium titanate (BaxSr1-xTiO3) is similar in structure to the typical perovskite phase structure, except that Sr2 + partially replaces Ba2 +. Larger Ba2 +, Sr2 + occupy the position of the vertex, the smaller Ti4 + occupy the position of the heart, six face by O2- occupied. These oxygen ions form oxygen octahedron, and Ti4 + is at its center. The coordination of Ba2 + / Sr2 + and Ti4 + is 12 and 6, respectively, because the gap between the oxygen octahedrons is occupied by Ba2 + / Sr2 +.

dielectric constant (225-250) and BaTiO3 (2*103-104) is much different. In order to overcome the shortcomings of the two materials,usually with Sr part of the substitution of Ba, the formation of BaxSr1-xTiO3 system material, By adjusting the value of x to meet the performance requirements of the capacitor ceramic material. Barium titanate structure As shown in the figure, barium strontium titanate (BaxSr1-xTiO3) is simila Rude structure to the typical perovskite phase structure, except that Sr2 + partially replaces Ba2 +. Larger Ba2 +, Sr2 + occupy the position of the vertex, the smaller Ti4 + occupy the position of the heart, six face by O2- occupied. (2) These are the gap between the oxygen octahedrons and are occupied by Ba2 + / Sr2 +.

 

Disadvantages of strontium barium titanate and its application method

Strontium barium titanate is obtained through the inverse reaction of barium titanate (BaTiO3) and strontium titanate (SrTiO3) at high temperature and solid, and is an infinite solid solution of BaTiO3 and SrTiO3. The crystal of BaTiO3 is in a highly polarized state under the interaction of ion displacement polarization and electron displacement polarization and has a high dielectric constant. However, BaTiO3 is significantly dependent on temperature. SrTiO3 as a new multifunctional ceramic material, compared with BaTiO3 has better temperature stability, lower dielectric loss (10-3-10-4), but to BaTiO3 dielectric constant (225-250) (103-104) 2 х differ a lot.

In order to overcome the shortcomings of the two materials, Sr part is usually used to replace Ba to form baxsr1-xtio3 system materials. Capacitor ceramics that meet performance requirements can be obtained by adjusting the x value. The structure of bxsr1-xtio3 titanate is similar to that of bxsr1-xtio3, which is a typical perovskite phase structure. The larger Ba2+ and Sr2+ occupied the position of the top Angle, the smaller Ti4+ occupied the position of the center of the body, and the six surface centers were occupied by O2-. These oxygen ions form oxygen octahedra with Ti4+ at its center. The whole crystal can be seen as connected by the co-vertex of the oxygen octahedron, and the space between each oxygen octahedron is occupied by Ba2+/Sr2+, so the ligands of Ba2+/Sr2+ and Ti4+ are 12 and 6, respectively.

Magnesium titanate (Mg2TiO4) is a basic inorganic dielectric material with excellent dielectric properties, frequency characteristics and mechanical properties.

Strontium titanate is an excellent dielectric properties, thermal properties, optical properties and static characteristics based on inorganic dielectric material, widely used in electronic ceramic material, has the function of high dielectric constant, low dielectric loss, heat stability, etc., are widely used in electronics, machinery, ceramic industry, ceramic capacitors, PTC thermistor, varistor, optical glass and carbon powder to improve the performance of place.

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