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Piezoelectric ceramic and piezoelectric element

A technology of piezoelectric ceramics and piezoelectric elements, applied in electrical components, piezoelectric devices/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc. problems, to achieve the effect of superior temperature stability, high yield, and simplified process

Active Publication Date: 2009-11-11
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, d 33 The constant is measured using the resonance impedance method, but in this method, the load applied to the piezoelectric element is small, so the dynamic characteristics when an actual load is applied cannot be evaluated

Method used

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  • Piezoelectric ceramic and piezoelectric element
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  • Piezoelectric ceramic and piezoelectric element

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Embodiment Construction

[0026] In the piezoelectric ceramics of the present invention, the piezoelectric ceramics mainly contain a bismuth layered compound, and the bismuth layered compound is expressed as Bi in a composition formula based on a molar ratio. 4 Ti 3 o 12 · β[(1-γ)M1TiO 3 · γM2M3O 3 ], satisfy 0.405≤β≤0.498, 0≤γ≤0.3, and M1 is selected from Sr, Ba, Ca, (Bi 0.5 Na 0.5 ), (Bi 0.5 Li 0.5 ) and (Bi 0.5 K 0.5 ), M2 is at least one selected from Bi, Na, K and Li, M3 is at least one selected from Fe and Nb, relative to the bismuth layered compound, that is, the main component 100 mass parts, as oxide (MnO 2 , Fe 2 o 3 ) conversion, at least one selected from Mn and Fe is contained in an amount of 0.05 to 1 part by mass.

[0027] Here, the reason for setting β as a coefficient to the above-mentioned range will be described. In the above composition formula, the reason for setting 0.405≤β≤0.498 is as follows: When β is greater than 0.498, the dynamic d at 200°C 33 Constant temperat...

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Abstract

The present invention provides a piezoelectric ceramic and a piezoelectric element, which have a large dynamic d33 (dynamic piezoelectric coefficient d33 ), can be used even under an elevated temperature of 200 DEG C, and exhibit a small variation between the dynamic d33 at room temperature and the dynamic d33 at 200 DEG C. The piezoelectric ceramic of the present invention is characterized by containing 100 parts by mass of a bismuth layered compound as a main component and a total of 0.05 to 1 part by mass, in terms of oxides (MnO2 and Fe2O3), of at least one of Mn and Fe, the bismuth layered compound being represented by a compositional formula of Bi 4 Ti3O12.beta [(1-gamma )M1TiO3.gamma M2M3O3], wherein and satisfy the following formulae: 0.405 <=beta <=0.498 and 0 <=gamma <=0.3, M1 represents at least one selected from Sr, Ba, Ca, (Bi0.5 Na0.5 ), (Bi0.5 Li0.5 ) and (Bi0.5 K0.5 ), M2 is at least one selected from Bi, Na, K and Li, and M3 is at least one of Fe and Nb.

Description

technical field [0001] The present invention relates to piezoelectric ceramics and piezoelectric elements, for example, to piezoelectric sensors suitable for use in resonators, ultrasonic vibrators, ultrasonic motors, or acceleration sensors, knock sensors, and AE sensors. Piezoelectric ceramics and piezoelectric elements are suitable for use in piezoelectric transducers with a positive piezoelectric effect for vibration. Background technique [0002] Conventionally, as products using piezoelectric ceramics, there are, for example, piezoelectric sensors, filters, piezoelectric resonators, ultrasonic vibrators, ultrasonic motors, and the like. Piezoelectric sensors are used as shock sensors, acceleration sensors, or knock sensors for vehicles. In particular, in recent years, in order to improve fuel consumption and reduce exhaust gas (HC, NOx) of automobile engines, direct detection of Internal pressure to achieve optimization of fuel injection timing from injectors with pie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475H01L41/187H01L41/08C04B35/462H01L21/8246H01L27/105H01L41/09H01L41/22H01L41/257H01L41/39H03H9/17
CPCC04B2235/5445C04B2235/3201C01P2006/32H01L41/187C01P2006/40C04B2235/3274C04B2235/3215C01G29/006C04B2235/765C04B2235/3208C04B2235/76C04B2235/3213C01P2002/72C04B35/475C04B2235/3203C04B2235/656C04B2235/3262C01P2002/52C04B2235/3272C04B35/6262C04B2235/3255C04B2235/3234C04B2235/3236C04B2235/3298C04B35/6261C04B2235/3251C04B2235/3267H10N30/853
Inventor 福冈修一
Owner KYOCERA CORP
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