Composition of piezoelectric porcelain

• US 6,402,981 B1
• Filed: 09/19/2000
• Issued: 06/11/2002
• Est. Priority Date: 09/20/1999
• Status: Expired due to Term

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Sasaki, Satoshi
• Primary Examiner(s): KOSLOW, CAROL M
• Application Number:
  US09/665,589
• Time in Patent Office: 630 Days
• Field of Search: 252/62.9 PZ, 501/134, 501/135
• US Class Current: 252/62.9PZ
• CPC Class Codes: C04B 35/493 containing also other lead compounds
• CPC Class Codes: H10N 30/8554 Lead zirconium titanate based

Abstract

There is provided a composition of piezoelectric porcelain which is composed as x(Pb₂Sb₂O₇)_½. (1−x)[Pb_a(Zr_yTi_z)O₃] (provided that 0.98≦a≦0.999, 0.005≦x≦0.05, 0.50≦y≦0.54, 0.46≦z≦0.50, y+z=1) is a main component, and to the weight of 1 mol of the main component, 0.1 to 1.0 wt % of at least one kind of W, Sb, Nb, and Ta in terms of WO₃, Sb₂O₃, Nb₂O₅, and Ta₂O₅ is added as a sub component, and 0.01 to 0.1 wt % of Si in terms of SiO₂ is added as a further sub component.

Claims

1. A composition of piezoelectric porcelain comprising:

a main component including x(Pb₂Sb₂O₇)_½

. (1−

x)[Pb_a(Zr_yTi_z)O₃], provided that 0.98≦

a≦

0.999, 0.005≦

x≦

0.05, 0.50≦

y≦

0.54, 0.46≦

z≦

0.50, and y+z=1;

0.1 to 1.0 wt % of at least one of W, Sb, Nb, and Ta in terms of WO₃, Sb₂O₃, Nb₂O₅, and Ta₂O₅ to the weight of 1 mol of the main component; and

0.01 to 0.1 wt % of Si in terms of SiO₂ to the weight of 1 mol of the main component.

2. A composition of piezoelectric porcelain comprising:

a main component including x(Me₂Sb₂O₇)_½

. (1−

x)[Pb_a(Zr_yTi_z)O₃], provided that 0.98≦

a≦

0.999, 0.005≦

x≦

0.05, 0.50≦

y≦

0.54, 0.46≦

z≦

0.50, y+z=1, and Me is at least one of Ba and Sr;

0.1 to 1.0 wt % of at least one of W, Sb, Nb, and Ta in terms of WO₃, Sb₂O₃, Nb₂O₅, and Ta₂O₅ to the weight of 1 mol of the main component; and

0.01 to 0.1 wt % of Si in terms of SiO₂ to the weight of 1 mol of the main component.