LEAD-FREE PIEZOCERAMIC MATERIAL BASED ON BISMUTH SODIUM TITANATE (BST)
First Claim
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1. A lead-free piezoceramic material based on bismuth sodium titanate (BST) of the fundamental composition
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Abstract
The invention relates to a lead-free piezoceramic material based on bismuth sodium titanate (BST) having the following parent composition: x(Bi0.5Na0.5)TiO3-yBaTiO3-zSrTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0≤z≤0.07 or x(Bi0.5Na0.5)TiO3-yBaTiO3-zCaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0<z≤0.05 or x(Bi0.5Na0.5)TiO3-y(Bi0.5K0.5)TiO3-zBaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0≤z<1, characterized by addition of a phosphorus-containing material in a quantity that gives a phosphorus concentration of from 100 to 2000 ppm in the piezoceramic material.
3 Citations
14 Claims
- 1. A lead-free piezoceramic material based on bismuth sodium titanate (BST) of the fundamental composition
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5. (canceled)
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7. (canceled)
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11. A use of a phosphoric material in a piezoceramic material based on bismuth sodium titanate (BST) of the fundamental composition
x(Bi0.5Na0.5)TiO3-yBaTiO3-zSrTiO3 with x+y+z=1 and 0<- x<
1,0<
y<
1,0≤
z≤
0.07
or
x(Bi0.5Na0.5)TiO3-yBaTiO3-zCaTiO3 with x+y+z=1 and 0<
x<
1,0<
y<
1,0≤
z≤
0.05to reduce the giant grain growth, wherein the phosphoric material is used in a quantity such that the concentration of phosphorus in the piezoceramic material is 100 to 2000 ppm, wherein the specification ppm (parts per million) relates to the mass of phosphorus in relation to the total mass of the piezoceramic composition. - View Dependent Claims (12, 13, 14)
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13. The use according to claim 11,
characterized in that the phosphoric compound is an inorganic phosphate, hydrogen phosphate, or dihydrogen phosphate. -
14. The use according to claim 11, characterized in that the phosphoric compound is selected from the group which consists of KH2PO4, (NH4)H2PO4.
- x<
Specification