Manufacturer and Supplier of Barium Titanate
BARIUM TITANATE HP2 DT77
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.
Analysis - H.P.2 Grades
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Percentage by weight
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Barium Oxide
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BaO
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65.0-66.0
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Titanium Dioxide
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TiO2
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33.8-34.5
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Alumina
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Al2O3
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0.10 max
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Silica
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SiO2
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0.05 max
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Strontia
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SrO
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0.15 max
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Calcium Oxide
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CaO
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0.05 max
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Magnesia
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MgO
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0.05 max
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Potassium Oxide
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K2O
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0.05 max
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Sodium Oxide
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Na2O
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0.05 max
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Iron Oxide
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Fe2O3
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0.05 max
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BaO+SrO : TiO2 mole ratio 1.00:1.01 Grade DT77
Physical Properties
Specific Gravity: 6.01
Melting Point: 1705°C
Ignition Loss: <0.5% (1000°C for 1 hour)
Particle Size Distribution
95% less than 5.0 microns
50% less than 1.5 microns
(Determined by Malvern Mastersizer 2000)
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Product Code: BATII
