Piezoelectric ceramic and piezoelectric element
A piezoelectric ceramics, internal electrode technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, electrical components, circuits, etc., can solve the problem of high environmental load
Active Publication Date: 2014-03-12
TAIYO YUDEN KK
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- Application Information
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Problems solved by technology
However, although these piezoelectric ceramics have high piezoelectric characteristics, they all contain Pb, which has a high environmental load.
Method used
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Embodiment
[0147] (1) Addition of MnO and NiO
[0148] As Example 1 of the present embodiment, samples 1 to 6 of piezoelectric devices having piezoelectric ceramics represented by the following composition formula (2) were fabricated. Here, p and q represent the number of moles, respectively.
[0149] 100 (Li 0.06 Na 0.52 K 0.42 ) Nb 3 +p(MnO)+q(NiO)+1.0(Li 2 O) + 1.4 (SiO 2 ) + 0.5 (SrO) + 0.5 (ZrO 2 )…(2)
[0150] Sample 1: p=0.5, q=0.1
[0151] Sample 2: p=0.5, q=0.5
[0152] Sample 3: p=0.5, q=1.0
[0153] Sample 4: p=0.5, q=2.0
[0154] Sample 5: p=0.1, q=0.5
[0155] Sample 6: p=2.0, q=0.5
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Abstract
A piezoelectric ceramic is constituted by a polycrystal whose main phase is an alkali-containing niobate perovskite structure, where both elemental nickel and elemental manganese are present at the grain boundary of the polycrystal. The piezoelectric ceramic is such that drop in piezoelectric characteristics due to application of high electric field is suppressed.
Description
technical field [0001] The present invention relates to piezoelectric ceramics with a lead-free perovskite niobate structure containing alkali metals and piezoelectric devices containing the piezoelectric ceramics. Background technique [0002] Piezoelectric ceramics are used as piezoelectric devices. Piezoelectric device application The piezoelectric effect capable of converting mechanical energy into electrical energy is used as a sensor device, a power generation device, and the like. In addition, piezoelectric devices are used as vibrators, sounding bodies, actuators, ultrasonic motors, etc. by applying the inverse piezoelectric effect that can convert electrical energy into mechanical energy. Also, the piezoelectric device combines the piezoelectric effect and the inverse piezoelectric effect and is used as a circuit device, a vibration control device, and the like. [0003] In general, piezoelectric devices have a structure in which sheet-shaped piezoelectric ceramic...
Claims
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IPC IPC(8): C04B35/495C04B35/622H01L41/187
CPCH01L41/083H01L41/1873H01L41/0471H01L41/273H10N30/50H10N30/8542H10N30/053H10N30/871
Inventor 波多野桂一岸本纯明土信田丰
Owner TAIYO YUDEN KK