Piezoelectric material and manufacturing method thereof
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsHitoshi Shindo, Atsuhiro Sumita, Eturo Yasuda, Takashi Yamamoto
Life of this patent
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Abstract
A piezoelectric material exhibiting a high Curie point and a high displacement at a low drive voltage is provided. The piezoelectric material contains as a main component a composite oxide and is expressed by the general formula [Pb{1−x1−x2−α(x1−x2)}, A1x1, A2x2] {(Tiy, Zrz) (1−β(x1−x2)−γ), (Y0.5, Nb0.5)γ}O3, where y+z=1, 1.15<z/y<1.30 and 0<γ<0.1; and A1, A2, x1, x2 satisfy any of the conditions (i) A1 is at least selected one of Ce and La, A2 is K, 0.02≦x1<0.08, 0≦x2≦0.05 (0.02≦x1+x2≦0.1, x1≦x2) and α=0, β=0.25 or α=0.5, β=0, and (ii) A1 is Sr, A2 is Ba, 0.03≦x1≦0.05, 0.03≦x2≦0.05 (|x1−x2|≦0.01), and α=0, β=0.
Claims8
A piezoelectric material containing, as a main component, a composite oxide expressed by the general formula
- [Pb{1−x1−x2−α(x1−x2)}, A1x1, A2x2]{(Tiy, Zrz)(1−β(x1−x2)−γ), (Y0.5, Nb0.5)γ}O3 (1)
- where y+z=1, 1.15<z/y<1.30, 0<γ<0.1, and A1, A2, x1, x2 satisfy any of the following conditions:
- (i) A1 is at least selected from one of Ce and La,
- A2 is K, 0.02≦x1<0.08, 0≦x2≦0.05
- (0.02≦x1+x2≦0.1, x1≧x2),
- and α=0.5, β=0
- (ii) A1 is at least selected from one of Ce and La,
- A2 is K, 0.02≦x1<0.08, 0≦x2≦0.05
- (0.02≦x1+x2≦0.1, x1≧x2), and
- α=0,β=0.25
- (iii) A1 is Sr, A2 is Ba,
- 0.03≦x1≦0.05, 0.03≦x2≦0.05
- (|x1−x2|≦0.01), and
- α=0, β=0.
A piezoelectric material containing as a main component a composite oxide expressed by the general formula
- [Pb{1−x1−x2−α(x1−x2)}, (Ce or La)x1, Kx2]{(Tiy, Zrz)(1−β(x1−x2)−γ), (Y0.5, Nb0.5)γ}O3 (2)
- where 0.02=≦x1<0.08, 0≦x2≦0.05(0.02≦x1+x2≦0.1, x1≦x2), y+z=1, 1.15<z/y<1.30, 0<γ≦0.1, and α=0,β=0.25 or α=0.5, β=0.
A piezoelectric material containing as a main component a composite oxide expressed by the general formula
- [Pb(1−x1−x2), Srx1, Bax2]{(Tiy, Zrz)(1−γ), (Y0.5, Nb0.5)γ}O3 (3)
- where 0.03≦x1≦0.05, 0.03≦x2≦0.05(|x1−x2|≦0.01), y+z=1, 1.15<z/y<1.30, and 0<γ<0.1.
A method of manufacturing a piezoelectric material containing as a main component a composite oxide expressed by the general formula
- [Pb{1−x1−x2−α(x1−x2)}, A1x1, A2x2]{(Tiy, Zrz)(1−β(x1−x2)−γ), (Y0.5, Nb0.5)γ}O3 (1)
- where y+z=1, 1.15<z/y<1.30, 0<γ<0.1, and
- wherein the compound of each component element providing an initial material is prepared in such a manner that A1, A2, x1, x2 satisfy any of the following conditions, mixed, calcined, crushed, granulated and then baked:
- (i) A1 is at least selected from one of Ce and La,
- A2 is K, 0.02≦x1<0.08, 0≦x2≦0.05
- (0.02≦x1+x2≦0.1, x1≧x2), and
- α=0.5, β=0
- (ii) A1 is at least selected from one of Ce and La,
- A2 is K, 0.02≦x1<0.08, 0≧x2≦0.05
- (0.02≦x1+x2≦0.1, x1≦x2) and
- α=0, β=0.25
- (iii) A1 is Sr, A2 is Ba,
- 0.03≦x1≦0.05, 0.03≦x2≦0.05
- (|x1−x2|≦0.01), and
- α=0, β=0.
A method of manufacturing a piezoelectric material containing, as a main component, a composite oxide expressed by the general formula
- [Pb{1−x1−x2−α(x1−x2)}, (Ce or La)x1, Kx2]{(Tiy, Zrz)(1−β(x1−x2)−γ), (Y0.5, Nb0.5)γ}O3 (2)
- wherein the compound of each component element of an initial material is prepared in such a manner as to satisfy the following conditions, mixed, calcined, crushed, granulated and then baked:
- 0.02≦x1≦0.08, 0≦x2≦0.05
- (0.02≦x1+x2≦0.1, x1≧x2),
- y+z=1, 1.15<z/y<1.30,
- 0<γ<0.1, and
- α=0, β=0.25or α=0.5, β=0.
A method of manufacturing a piezoelectric material containing as a main component a composite oxide expressed by the general formula:
- [Pb(1−x1−x2), Srx1, Bax2}{(Tiy, Zrz)(1−γ), (Y0.5, Nb0.5)γ}O3 (3)
- wherein the compound of each component element of an initial material is prepared in such a manner as to satisfy the following conditions, mixed, calcined, crushed, granulated and then baked:
- where 0.03≦x1≦0.05, 0.03≦x2≦0.05
- (|x1−x2|≦0.01),
- y+z=1, 1.15<z/y<1.30, and
- 0<γ<0.1.
Dependencies are inferred from the claim text.