Piezoelectric porcelain composition, piezoelectric device, and methods of making thereof
AssigneeTDK Corporation
InventorsSatoshi Sasaki, Kenji Koseki
Life of this patent
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Abstract
A piezoelectric porcelain composition containing a complex oxide having a perovskite structure mainly composed of Pb, Zr, and Ti; and the following component (a) and/or (b), or component (A) and/or (B): (a) Ag and/or an Ag compound, and Mo and/or an Mo compound (b) silver molybdate [Ag2MoO4] (A) Ag and/or an Ag compound, Mo and/or an Mo compound, and W and/or a W compound (B) silver molybdate-tungstate [Ag2Mo(1−X)WXO4](where X is a number from 0.3 to 0.7)
Claims28
A piezoelectric porcelain composition comprising:
- a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti;
- and
- at least of the following components (a) and (b), wherein
- (a) is at least one of Ag and an Ag compound, and at least one of Mo and an Mo compound;
- and wherein
- (b) is silver molybdate [Ag2MoO4].
A piezoelectric porcelain composition comprising a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti;
- and at least one of the following components (A) and (B), wherein
- (A) is at least one of Ag and an Ag compound, at least one of Mo and an Mo compound, and at least one of W and a W compound, and wherein
- (B) is silver molybdate-tungstate [Ag2Mo(1−X)WXO4](where X is a number from 0.3 to 0.7).
A piezoelectric porcelain composition:
- wherein the composition is made by adding at least one of Ag and an Ag compound, and at least one of Mo and an Mo compound to a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti, and
- wherein the composition comprises silver molybdate [Ag2MoO4].
A piezoelectric porcelain composition comprising:
- a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti;
- and
- 0.12 mol % to 0.36 mol % of silver molybdate [Ag2MoO4].
A piezoelectric porcelain composition,
- wherein the composition is made by adding at least one of Ag and an Ag compound, and at least one of Mo and an Mo compound to a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti, and
- wherein respective amount of Ag and Mo calculated as Ag2O and MoO3 satisfy all of the following expressions (i) to (iii):
- Ag2O amount−MoO3 amount≦0.12 mol % (i)
- 0.24 mol %≦Ag2O amount≦0.48 mol % (ii)
- 0.12 mol %≦Mo3O amount≦0.36 mol %. (iii)
A piezoelectric porcelain composition,
- wherein the composition is made by adding at least one of Ag and an Ag compound, at least one of Mo and an Mo compound, and at least one of W and a W compound to a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti, and
- wherein the composition comprises silver molybdate-tungstate [Ag2Mo(1−X)WXO4](where X is a number from 0.3 to 0.7).
A piezoelectric porcelain composition comprising:
- a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti;
- and
- 0.12 mol % to 0.36 mol % of silver molybdate-tungstate [Ag2Mo(1−X)WXO4](where X is a number from 0.3 to 0.7).
A piezoelectric porcelain composition,
- wherein the composition is made by adding at least one of Ag and an Ag compound, at least one of Mo and an Mo compound, and at least one of W and a W compound to a complex oxide having a perovskite structure mainly composed of Pb, Zr and Ti, and
- wherein respective amount of Ag, Mo and W calculated as Ag2O, MoO3 and WO3 satisfy all of the following expressions (1) to (3):
- Ag2O amount−((1−X)·MoO3+X·WO3) amount≦0.12 mol % (1)
- 0.24 mol %≦Ag2O amount≦0.48 mol % (2)
- 0.12 mol %≦(Mo3O+WO3)amount≦0.36 mol % (3)
- where X is a number from 0.3 to 0.7.
A method of making a piezoelectric porcelain composition which comprises:
- a step of forming a complex oxide having a perovskite structure by temporarily firing a material comprising Pb, Zr, and Ti;
- and
- a step of adding at least one of Ag and an Ag compound, and at least one of Mo and an Mo compound to the complex oxide.
A method of making a piezoelectric porcelain composition which comprises:
- a step of forming a complex oxide having a perovskite structure by temporarily firing a material comprising Pb, Zr, and Ti;
- and
- a step of adding silver molybdate [Ag2MoO4] to the complex oxide.
A method of making a piezoelectric porcelain composition which comprises:
- a step of forming a complex oxide having a perovskite structure by temporarily firing a material comprising Pb, Zr, and Ti;
- and
- a step of adding at least one of Ag and an Ag compound, at least one of Mo and an Mo compound, and at least one of W and a W compound to the complex oxide.
A method of making a piezoelectric porcelain composition which comprises:
- a step of forming a complex oxide having a perovskite structure by temporarily firing a material comprising Pb, Zr, and Ti;
- and
- a step of adding silver molybdate-tungstate [Ag2Mo(1−X)WXO4](where X is a number from 0.3 to 0.7) to the complex oxide.
Dependencies are inferred from the claim text.