Barium Titanate HP2 DT79 – Technical Data

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 primary component.

Typical Analysis

H.P.2 Grades.

(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)

Note: Handling and safety data sheets are available on request.