Lead-free piezoceramic material based on bismuth sodium titanate (BST)

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≤0.05
• to 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 250 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.

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<0.05
• to 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 270 to 1800 ppm,
• wherein the specification ppm (parts per million) relates to the mass of phosphorus in relation to the total mass of the piezoceramic composition.