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Piezoelectric composition and piezoelectric element

專利號(hào)
US11659769B2
公開日期
2023-05-23
申請(qǐng)人
TDK CORPORATION（JP Tokyo）
發(fā)明人
Masakazu Hirose; Yuiko Hirose; Hiroki Katoh
IPC分類
H01L41/187
技術(shù)領(lǐng)域
mn,0.995,in,cv,0.000,powder,element,strength,k31,grains
地域： Tokyo

摘要

A piezoelectric composition including manganese and a complex oxide having a perovskite structure represented by a general formula ABO3, wherein an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium, a concentration distribution of the manganese has a variation, and the variation shows a CV value of 35% or more and 440% or less.

說明書

BACKGROUND OF THE INVENTION

The present invention relates to a piezoelectric composition and a piezoelectric element having thereof.

The piezoelectric composition has, based on a spontaneous polarization due to bias of an electric charge in crystals, an effect (a piezoelectric effect) of generating electric charge on the surface due to receiving an external stress and an effect (a converse piezoelectric effect) of generating distortion due to an application of an external electric field.

Piezoelectric elements to which such piezoelectric compositions, capable of mutually converting mechanical displacement and electrical displacement, are applied are widely used in various fields. For example, an actuator as the piezoelectric element utilizing the converse piezoelectric effect, in relative to an applied voltage, can provide a minute displacement with a high precision and has a fast response speed. Therefore, the actuator can be used for driving e.g. an optical system component, an HDD head, an ink jet printer head, and a fuel injection valve.

It is also used as a sensor for reading a minute force or deformation amount using the piezoelectric effect. Furthermore, since the piezoelectric composition has an excellent responsiveness, resonance can also be caused by exciting the piezoelectric composition itself or an elastic body that is connected with the piezoelectric composition by applying an AC electric field. Therefore, it is also used as a piezoelectric transformer, an ultrasonic motor, etc.

權(quán)利要求

1
What is claimed is:1. A piezoelectric composition comprising manganese and a complex oxide having a perovskite structure represented by compositional formula (Kx, Nay)NbO3,whereinx and y in the compositional formula satisfy 0.800≤x≤1.005, y≤0.190, and 0.980≤x+y≤1.005,a concentration distribution of the manganese has a variation, andthe variation shows a CV value of 35% or more and 440% or less.2. The piezoelectric composition according to claim 1, whereinthe manganese is included in z mol % in terms of MnO2 with respect to 1 mol of the complex oxide, andz satisfies 0.50≤z≤2.50.3. The piezoelectric composition according to claim 1 comprising copper, whereinthe copper is included in n mol % in terms of CuO with respect to 1 mol of the complex oxide, andn satisfies 0.20≤n≤0.80.4. A piezoelectric element including the piezoelectric composition according to claim 1.5. The piezoelectric composition according to claim 2 comprising copper, whereinthe copper is included in n mol % in terms of CuO with respect to 1 mol of the complex oxide, andn satisfies 0.20≤n≤0.80.6. A piezoelectric element including the piezoelectric composition according to claim 2.7. A piezoelectric element including the piezoelectric composition according to claim 3.8. A piezoelectric element including the piezoelectric composition according to claim 5.
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