Product Data Sheet For Barium Titanate HP2 DT77
BARIUM TITANATE
Product Chemistry
The reaction between the oxides of Group II elements and Titanium Dioxide forms a series of titanate phases of general formula M x Ti y O x+2y . These compounds are of technical interest because of their ferroelectric properties resulting from the large difference in size between for example the Ba 2+ ion (1.43A) and the Ti 4+ ion (0.60A). This allows the Ti 4+ ion a high degree of mobility in the octahedral lattice. Application of an electric field to the crystal causes polarisation as the titanium Ti 4+ 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 BaTi0 3 is usually the major component.
Specification - H.P.2 Grades
|
Barium Oxide
|
BaO
|
65.0-66.0
|
|
Titanium Dioxide
|
TiO 2
|
33.8-34.5
|
|
Alumina
|
A1 2 O 3
|
0.10 max
|
|
Silica
|
SiO 2
|
0.05 max
|
|
Strontia
|
SrO
|
0.15 max
|
|
Calcium Oxide
|
CaO
|
0.05 max
|
|
Magnesia
|
MgO
|
0.05 max
|
|
Potassium Oxide
|
K 2 O
|
0.05 max
|
|
Sodium Oxide
|
Na 2 O
|
0.05 max
|
|
Iron Oxide
|
Fe 2 O 3
|
0.05 max
|
Percentage by weight
(BaO+SrO : TiO 2 mol.ratio = 1.00 - 1.01) Grade DT77
Physical Properties
|
Specific Gravity
|
6.01
|
|
Melting Point
|
1705°C
|
|
Loss on ignition
|
<0.5% (1 hr at 1000 ° C)
|
Particle Size Distribution
95% less than 5.0 microns 50% less than 1.5 microns (Malvern Mastersizer 2000)
Handling and Safety
A safety data sheet is available on request.
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Product Code: HP2 DT77
