• barium_titanate_hp2_dt79_81-500x500

Barium Titanate (BaTi)

BARIUM TITANATE HP2 DT79

Product Chemistry

The reaction between the oxides of Group II elements and Titanium Dioxide forms a series of titanate phases of general formula MxTiyOx+2y. These compounds are of technical interest because of their ferroelectric properties resulting from the large difference in size between for example the Ba2+ ion (1.43A) and the Ti4+ ion (0.60A).

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Product Description

BARIUM TITANATE HP2 DT79

Product Chemistry

The reaction between the oxides of Group II elements and Titanium Dioxide forms a series of titanate phases of general formula MxTiyOx+2y. These compounds are of technical interest because of their ferroelectric properties resulting from the large difference in size between for example the Ba2+ ion (1.43A) and the Ti4+ ion (0.60A). This allows the Ti4+ ion a high degree of mobility in the octahedral lattice. Application of an electric field to the crystal causes polarisation as the titanium Ti4+ ions are drawn over to one side of the octahedron. The tetragonal crystalline form also has a very high dielectric constant which varies with temperature. These phenomena make Titanate compounds especially important for the manufacture of ceramic capacitors in which BaTiO3 is usually the major component.

Typical Analysis

H.P.2 Grades.

Percentage by weight
Barium Oxide BaO 65.0-66.0
Titanium Dioxide TiO2 33.8-34.5
Alumina Al2O3 0.10 max
Silica SiO2 0.05 max
Strontia SrO 0.15 max
Calcium Oxide CaO 0.05 max
Magnesia MgO 0.05 max
Potassium Oxide K2O 0.05 max
Sodium Oxide Na2O 0.05 max
Iron Oxide Fe2O3 0.05 max

 

(BaO+SrO/TiO2 mole ratio 0.98) Grade DT79

Physical Properties

Specific Gravity: 6.01

Melting Point: > 1705°C

Ignition Loss: <0.5% (1 hr at 1000°C)

Particle Size Distribution

90% less than 5.0 microns
50% less than 2.5 microns
(Determined by Malvern Mastersizer 2000)

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