US4565642A
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Piezoelectric substances
Assignee: Hitachi Ltd
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Filing: 1983-07-13
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Granted: 1986-01-21
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Expires: 2003-07-13
Abstract
Abstract A piezoelectric substance, which comprises a ternary solid solution having a composition represented by the general formula: xPbZrO3-yA-zPbTiO3 and having a composition ratio represented by coordinate in a square formed by successively connecting point P (x=0.905; y=0.095; z=0.000), point Q (x=0.960; y=0.040; z=0.000), point R (x=0.932; y=0.005; z=0.063), point S (x=0.905; y=0.005; z=0.090) and said P by straight lines, including the respective lines except axis y in a ternary composition diagram showing the composition of said ternary solid solution, and said A being Pb(Mn1/3Nb2/3)O3, Pb(Mn1/2Nb1/2)O3, Pb(Fe1/2Sb1/2)O3, Pb(Mn1/2Ta1/2)O3, Pb(Mn1/3Sb2/3)O3, Pb(Mn1/2Sb1/2)O3, Pb(Fe1/2Nb1/2)O3, Pb(Fe1/3Sb2/3)O3, Pb(Mn1/3Ta2/3)O3, Pb(Fe1/3Nb2/3)O3, Pb(Sb1/2Ta1/2)O3, Pb(Fe1/3Ta2/3)O3, Pb(Mn2/3W1/3)O3, Pb(Sb1/2Nb 1/2)O3, Pb(Fe1/2Ta1/2)O3, or Pb(Fe2/3Te1/3)O3. The piezoelectric substance has a high electromechanical anistoropy in electromechanical coupling factors, a high electromechanical coupling factor of thickness vibration mode, and a low dielectric constant and serves as a distinguished material for ultrasonic vibrator, etc.
Inventors
- 👤 Shigeru Jyomura
- 👤 Hiroshi Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/493; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A piezoelectric substance, which consists essentially of a binary solid solution having a composition represented by the general formula: xPbZrO.sub.3 --yA wherein 0.905≦x≦0.960 and x+y=1.00 and A is a substance selected from the group consisting of Pb(Mn 1/3 Nb 2/3 )O 3 , Pb(Mn 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Sb 1/2 )O 3 , Pb(Mn 1/2 Ta 1/2 )O 3 , Pb(Mn 1/3 Sb 2/3 )O 3 , Pb(Mn 1/2 Sb 1/2 )O 3 , Pb(Fe 1/2 Nb 1/2 )O 3 , Pb(Fe 1/3 Sb 2/3 )O 3 , Pb(Mn 1/3 Ta 2/3 )O 3 , Pb(Fe 1/3 Nb 2/3 )O 3 , Pb(Sb 1/2 Ta 1/2 )O 3 , Pb(Fe 1/3 Ta 2/3 )O 3 , Pb(Mn 2/3 W 1/3 )O 3 , Pb(Sb 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Ta 1/2 )O 3 , and Pb(Fe 2/3 Te 1/3 )O 3 , the binary solid solution having an electromechanical coupling factor of thickness vibration mode kt of at least 0.46 and an electromechanical coupling factor ratio kt/kp of at least 9.2.
Claim 2
Dependent Claim
178 words
A piezoelectric substance, which consists essentially of a binary solid solution having a composition represented by the general formula: xPbZrO.sub.3 --yA wherein 0.905≦x≦0.960 and x+y=1.00 and A is a substance selected from the group consisting of Pb(Mn 1/3 Nb 2/3 )O 3 , Pb(Mn 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Sb 1/2 )O 3 , Pb(Mn 1/2 Ta 1/2 )O 3 , Pb(Mn 1/3 Sb 2/3 )O 3 , Pb(Mn 1/2 Sb 1/2 )O 3 , Pb(Fe 1/2 Nb 1/2 )O 3 , Pb(Fe 1/3 Sb 2/3 )O 3 , Pb(Mn 1/3 Ta 2/3 )O 3 , Pb(Fe 1/3 Nb 2/3 )O 3 , Pb(Sb 1/2 Ta 1/2 )O 3 , Pb(Fe 1/3 Ta 2/3 )O 3 , Pb(Mn 2/3 W 1/3 )O 3 , Pb(Sb 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Ta 1/2 )O 3 , and Pb(Fe 2/3 Te 1/3 )O 3 , the binary solid solution having an electromechanical coupling factor of thickness vibration mode kt of at least 0.46 and an electromechanical coupling factor ratio kt/kp of at least 9.2.
Claim 3
Dependent Claim
243 words
A piezoelectric substance, which consists essentially of a ternary solid solution having a composition represented by the general formula: xPbZrO.sub.3 --yA--zPbTiO.sub.3 and having a composition ratio represented by coordinate in a quadrilateral formed by successively connecting point P (x=0.905; y=0.095; z=0.000), point Q (x=0.960; y=0.040; z=0.000), point R (x=0.932; y=0.005; z=0.063), point S (x=0.905; y=0.005; z=0.090) and said P by straight lines, including the respective lines except the straight line connecting point P to point Q, in a ternary composition diagram showing the composition of said ternary solid solution, and said A being a substance selected from the group consisting of Pb(Mn 1/3 Nb 2/3 )O 3 , Pb(Mn 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Sb 1/2 )O 3 , Pb(Mn 1/2 Ta 1/2 )O 3 , Pb(Mn 1/3 Sb 2/3 )O 3 , Pb(Mn 1/2 Sb 1/2 )O 3 , Pb(Fe 1/2 Nb 1/2 )O 3 , Pb(Fe 1/3 Sb 2/3 )O 3 , Pb(Mn 1/3 Ta 2/3 )O 3 , Pb(Fe.sub. 1/3 Nb 2/3 )O 3 , Pb(Sb 1/2 Ta 1/2 )O 3 , Pb(Fe 1/3 Ta 2/3 )O 3 , Pb(Mn 2/3 W 1/3 )O 3 , Pb(Sb 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Ta 1/2 )O 3 , and Pb(Fe 2/3 Te 1/3 )O 3 , the ternary solid solution having an electromechanical coupling factor of thickness vibration mode kt of at least 0.46 and an electromechanical coupling factor ratio kt/kp of at least 9.6.
Claim 4
Dependent Claim
243 words
A piezoelectric substance, which consists essentially of a ternary solid solution having a composition represented by the general formula: xPbZrO.sub.3 --yA--zPbTiO.sub.3 and having a composition ratio represented by coordinate in a quadrilateral formed by successively connecting point P (x=0.905; y=0.095; z=0.000), point Q (x=0.960; y=0.040; z=0.000), point R (x=0.932; y=0.005; z=0.063), point S (x=0.905; y=0.005; z=0.090) and said P by straight lines, including the respective lines except the straight line connecting point P to point Q, in a ternary composition diagram showing the composition of said ternary solid solution, and said A being a substance selected from the group consisting of Pb(Mn 1/3 Nb 2/3 )O 3 , Pb(Mn 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Sb 1/2 )O 3 , Pb(Mn 1/2 Ta 1/2 )O 3 , Pb(Mn 1/3 Sb 2/3 )O 3 , Pb(Mn 1/2 Sb 1/2 )O 3 , Pb(Fe 1/2 Nb 1/2 )O 3 , Pb(Fe 1/3 Sb 2/3 )O 3 , Pb(Mn 1/3 Ta 2/3 )O 3 , Pb(Fe.sub. 1/3 Nb 2/3 )O 3 , Pb(Sb 1/2 Ta 1/2 )O 3 , Pb(Fe 1/3 Ta 2/3 )O 3 , Pb(Mn 2/3 W 1/3 )O 3 , Pb(Sb 1/2 Nb 1/2 )O 3 , Pb(Fe 1/2 Ta 1/2 )O 3 , and Pb(Fe 2/3 Te 1/3 )O 3 , the ternary solid solution having an electromechanical coupling factor of thickness vibration mode kt of at least 0.46 and an electromechanical coupling factor ratio kt/kp of at least 9.6.
References Cited (Backward Citations)
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