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Piezoelectric composition and piezoelectric device

A piezoelectric element and composition technology, which is applied in electrical elements, piezoelectric/electrostrictive/magnetostrictive devices, iron compounds, etc., and can solve the problem of large leakage current, high anisotropy, and inability to obtain piezoelectric properties, etc. question

Active Publication Date: 2018-09-07
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in BFO, sufficient piezoelectric properties (such as 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 1

[0060] A piezoelectric element was fabricated according to the method shown below. Bismuth oxide (Bi 2 o 3 ), iron oxide (Fe 2 o 3 ), barium carbonate (BaCO 3 ), strontium carbonate (SrCO 3 ), and titanium oxide (TiO 2) of each powder raw material. These powder raw materials were weighed and prepared so that the sintered body after main sintering became a piezoelectric composition represented by the following chemical formula (3), and a mixed raw material was prepared.

[0061] x[Bi m FeO 3 ]-y[Ba m TiO 3 ]-z[Sr m TiO 3 ] (3)

[0062] In the above chemical formula (3), x=0.58, y=0.4, z=0.02, m=1.00.

[0063] Next, the prepared mixed raw material and pure water were mixed together with Zr balls by a ball mill for 10 hours to obtain a slurry. After sufficiently drying the slurry, press molding was performed, and calcining was performed at a temperature of 800° C. to obtain a calcined body. Next, after finely pulverizing the calcined body with a ball mill, it was ...

Embodiment 2～11、 comparative example 1～6

[0074] Except that x, y, z, and m in the above chemical formula (3) become the values ​​shown in the following Table 1 or Table 2, except that the proportion of the powder raw material is changed and the mixed raw material is prepared, the other methods are the same as in Example 1. The piezoelectric elements of Examples 2 to 11 and Comparative Examples 1 to 6 were produced one by one by the same method. The composition of each of the sintered bodies of Examples 2-11 and Comparative Examples 1-6 was analyzed by the same method as Example 1. As a result, it was confirmed that the compositions of the sintered bodies of Examples 2 to 11 and Comparative Examples 1 to 6 were those shown in Table 1 or Table 2. By the same method as in Example 1, the d of Examples 2 to 11 and Comparative Examples 1 to 6 were measured one by one. 33 . The d of Examples 2-11 and Comparative Examples 1-6 33 Shown in Table 1 or Table 2. The specific resistances of Examples 2-11 and Comparative Exampl...

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Abstract

An aim of the invention is to provide a piezoelectric composition the d33of which is large and the specific resistance of which is large and a piezoelectric device using the piezoelectric composition.The piezoelectric composition is represented by the following Chemical Formula (1): x[Bi m FeO 3 ]-y[Ba m TiO 3 ]-z [Sr m TiO 3 ] (1) wherein 0.5 <= x <= 0.8, 0.02 <= y <= 0.4, 0.02<= z <= 0.2, x + y+ z = 1, and 0.96 <= m <= 1.04.

Description

technical field [0001] The present invention relates to a piezoelectric composition and a piezoelectric element. Background technique [0002] A perovskite type metal oxide is known as a general piezoelectric composition. The composition of perovskite metal oxides is based on ABO 3 To represent. Perovskite-type piezoelectric compositions such as lead zirconate titanate [Pb(Zr,Ti)O 3 :PZT]. The Curie temperature (Tc) of lead zirconate titanate (PZT) is high and the piezoelectric constant (d 33 )Big. However, since PZT contains lead as an element at the A site, it is harmful to the environment and the human body. A lead-free piezoelectric composition is required in consideration of influence on the environment or the human body. [0003] Specific examples of piezoelectric compositions that do not use lead include bismuth ferrite (BiFeO 3 ). The Tc of bismuth ferrite (BFO) is high, and BFO exhibits large spontaneous polarization. However, in BFO, sufficient piezoelect...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622H01L41/187
CPCC04B35/2683C04B35/622C04B2235/327C04B2235/3232C04B2235/3213C04B2235/3215C04B2235/3298H10N30/8536H10N30/8561C04B35/26C01G23/006C01G49/0018C01P2002/34C04B2235/3236H10N30/097C04B35/453C04B35/6261C04B35/63416C04B35/62695C04B35/638C04B2235/6567C04B2235/3274C04B2235/604C04B35/64
Inventor 寺西惠介北﨑将士石﨑诚
Owner TDK CORPARATION