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Piezoelectric composition and piezoelectric device

A composition and piezoelectric technology, applied in electrical components, piezoelectric/electrostrictive/magnetostrictive devices, material selection for piezoelectric devices or electrostrictive devices, etc., can solve the high anisotropy of BFO , BFO does not have piezoelectricity and other issues

Active Publication Date: 2020-07-28
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since BFO has high anisotropy, a large leakage current is easily generated in BFO, so BFO does not have sufficient piezoelectricity (for example, piezoelectric constant d 33 )

Method used

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  • Piezoelectric composition and piezoelectric device
  • Piezoelectric composition and piezoelectric device
  • Piezoelectric composition and piezoelectric device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0064] As a starting material, Bi 2 o 3 powder, Fe 2 o 3 powder, BaCO 3 powder and TiO 2 of powder. BaCO is weighed so that the molar ratio of Bi, Fe, Ba, and Ti in the entirety of the starting materials matches the molar ratio of Bi, Fe, Ba, and Ti in Chemical Formula 1 below. 3 、TiO 2 、 Bi 2 o 3 and Fe 2 o 3 . In the case of Example A1, the values ​​of x, y, m, and n in Chemical Formula 1 are values ​​shown in Table 1 below.

[0065] x[Bi m FeO 3 ]-y[Ba n TiO 3 ] (1)

[0066] All starting materials and pure water were mixed for 10 hours with a ball mill. After drying the mixed starting materials, a preform is obtained by press molding of the starting materials. A calcined body was obtained by heating the preform at 800°C. The calcined body was pulverized with a ball mill. Raw material particles were obtained by drying the pulverized calcined body. A molded body was obtained by press molding of a mixture of raw material pellets and a binder (polyvinyl alc...

Embodiment A2～A10

[0076] (Examples A2-A10, B1-B15, C1-C15, D1-D15, E1-E11 and Comparative Examples 1-5)

[0077] Under the situation of embodiment A2~A10, B1~B15, C1~Cl5, D1~D15, E1~E11 and comparative example 1~5, by the weighing of starting material, x, y, m and n are adjusted to The values ​​shown in Tables 1 to 5 below.

[0078] In the case of Examples A2~A10, B1~B15, C1~C15, D1~D15, E1~E11 and Comparative Examples 1~5, the heating rate V T , the first firing temperature T S1 , and the second firing temperature T S2 It is the value shown in the following Tables 1-5.

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Abstract

The invention discloses a piezoelectric composition, and the composition comprises an oxide having a perovskite structure, wherein the oxide contains bismuth, barium, iron and titanium; the X-ray diffraction pattern of the piezoelectric composition after a polarization treatment has a first peak and a second peak in the range of the diffraction angle 2theta of 38.6 degrees or more and 39.6 degreesor less; the diffraction angle 2theta of the first peak is smaller than the diffraction angle 2theta of the second peak; an intensity of the first peak is represented as IL; an intensity of the second peak is represented as IH; and IH / IL is 0.00 or more and 2.00 or less.

Description

technical field [0001] The present invention relates to a piezoelectric composition and a piezoelectric element. Background technique [0002] Most of the currently practical piezoelectric compositions are made of lead zirconate (PbZrO 3 ) and lead titanate (PbTiO 3 ) constitute a solid solution (so-called PZT-based piezoelectric composition). The PZT-based piezoelectric composition contains a large amount of lead oxide (PbO) as a main component. Since lead oxide is extremely volatile even at low temperatures, a large amount of lead oxide diffuses into the atmosphere during the manufacturing process of the piezoelectric composition or the piezoelectric element using the piezoelectric composition. Since lead is an environmental pollutant harmful to humans, lead-free piezoelectric compositions are being sought. [0003] A typical piezoelectric composition that does not contain lead is bismuth ferrite (BiFeO 3 ). Bismuth ferrite (BFO) exhibits large spontaneous polarizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26H01L41/18H01L41/187H10N30/045H10N30/077H10N30/084H10N30/097H10N30/85H10N30/853
CPCC04B35/2683C04B2235/3298C04B2235/3232C04B2235/3215H10N30/8536H10N30/852H10N30/8561H10N30/097H10N30/045
Inventor 北﨑将士
Owner TDK CORPARATION
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