US5188992A
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Piezoelectric ceramic composition for actuators
Assignee: Mitsubishi Chemical Corp
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Filing: 1991-09-19
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Granted: 1993-02-23
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Expires: 2011-09-19
Abstract
Abstract A piezoelectric ceramic composition for actuators, composed of lead, lanthanum, zirconium, titanium, magnesium, zinc, niobium, manganese, chromium and oxygen atoms, which contains manganese in an amount of at most 1.5% by weight as calculated as Mn 2 O and chromium in an amount of at most 0.5% by weight as calculated as Cr 2 O 3 , relative to a main component composition of the formula (I): Pb.sub.(1-x) La.sub.x [(1-z)(Zr.sub.y Ti.sub.(1-y))+z{Mg.sub.q Zn.sub.(1-q)) 1/3 Nb 2/3 }].sub.(1-x/4) O 3 (I) wherein 0<x≦0.07, 0.40≦y≦0.65, 0≦q≦1, and 0<z≦0.40.
Inventors
- 👤 Tetsuhiko Nishimura
- 👤 Takahiro Choda
- 👤 Yukio Chida
- 👤 Yasuo Oguri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:55
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853; H10N30/8548; H10N30/8554; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/493; C04B35/495; C04B35/497; C04B35/499
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A piezoelectric ceramic composition for actuators, composed of lead, lanthanum, zirconium, titanium, magnesium, zinc, niobium, manganese, chromium and oxygen atoms, which contains manganese in an amount of at most 1.5% by weight as calculated as MnO and chromium in an amount of at most 0.5% by weight as calculated as Cr 2 O 3 , relative to a main component composition of the formula (I): Pb.sub.(1-x) La.sub.x [(1-z)(Zr.sub.y Ti.sub.(1-y))+z{Mg.sub.q Zn.sub.(1-q)).sub.1/3 Nb.sub.170 }].sub.(1-x/4) O.sub.3 (I) wherein 0<x≦0.07, 0.40≦y≦0.65, 0≦q≦1, and 0<z≦0.40.
Claim 2
Dependent Claim
80 words
A piezoelectric ceramic composition for actuators, composed of lead, lanthanum, zirconium, titanium, magnesium, zinc, niobium, manganese, chromium and oxygen atoms, which contains manganese in an amount of at most 1.5% by weight as calculated as MnO and chromium in an amount of at most 0.5% by weight as calculated as Cr 2 O 3 , relative to a main component composition of the formula (I): Pb.sub.(1-x) La.sub.x [(1-z)(Zr.sub.y Ti.sub.(1-y))+z{Mg.sub.q Zn.sub.(1-q)).sub.1/3 Nb.sub.170 }].sub.(1-x/4) O.sub.3 (I) wherein 0<x≦0.07, 0.40≦y≦0.65, 0≦q≦1, and 0<z≦0.40.
Claim 3
Dependent Claim
29 words
The piezoelectric ceramic composition for actuators according to claim 1, wherein manganese is contained in an amount of at least 0.3% by weight as calculated as MnO 2 .
Claim 4
Dependent Claim
30 words
The piezoelectric ceramic composition for actuators according to claim 2, wherein manganese is contained in an amount of from 0.4 to 1.2% by weight as calculated as MnO 2 .
Claim 5
Dependent Claim
31 words
The piezoelectric ceramic composition for actuators according to claim 2, wherein chromium is contained in an amount of at least 0.002% by weight as calculated as Cr 2 O 3 .
Claim 6
Dependent Claim
20 words
The piezoelectric ceramic composition for actuators according to claim 2, wherein x in the formula (I) is at most 0.05.
Claim 7
Dependent Claim
29 words
The piezoelectric ceramic composition for actuators according to claim 1, wherein manganese is contained in an amount of less than 0.3% by weight as calculated as MnO 2 .
Claim 8
Dependent Claim
30 words
The piezoelectric ceramic composition for actuators according to claim 6, wherein manganese is contained in an amount of from 0.05 to 0.25% by weight as calculated as MnO 2 .
Claim 9
Dependent Claim
31 words
The piezoelectric ceramic composition for actuators according to claim 6, wherein chromium is contained in an amount of at least 0.002% by weight as calculated as Cr 2 O 3 .
Claim 10
Dependent Claim
20 words
The piezoelectric ceramic composition for actuators, according to claim 6, wherein x in the formula (I) is at most 0.05.
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