Piezoelectric ceramic composition

A technology of piezoelectric ceramics and composites, applied in circuits, piezoelectric/electrostrictive/magnetostrictive devices, electrical components, etc., can solve problems that are not suitable for general sensors and actuators, and achieve improved mechanical quality factors, Excellent piezoelectric performance, the effect of reducing the rate

Inactive Publication Date: 2004-03-17
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of ceramic composition is not suitable f...

Method used

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  • Piezoelectric ceramic composition
  • Piezoelectric ceramic composition

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The piezoelectric ceramic composition according to Example 1 was prepared as follows. First, weigh BaCO as a raw material 3 , Bi 2 o 3 , NaCO 3 , CaCO 3 ,TiO 2 and MnCO 3 , and finally obtain piezoelectric ceramics that may have a given formulation ratio as shown in Table 1, and mix them uniformly in a ball mill. Next, it is calcined at a temperature of 800-1,000° C. for 2 hours to form a compound. The compound is ground again in a ball mill, polyvinyl alcohol is added to the compound granules, and the mixture is granulated. The granulated powder was uniaxially compression molded under a pressure of 70 MPa to form a disc with a diameter of 13 mm, which was then heated at 1000-1400° C. for 2 hours.

[0035] The disk-shaped sample was ground to a thickness of 0.3 mm, and Ag was baked and fused at 700° C. to condense on the sample disk to form electrodes thereon. Thereafter, the sample disk was subjected to polarization treatment by applying an electric field of 3...

Embodiment 2

[0043] A piezoelectric ceramic composition according to Example 2 was prepared as follows. First, weigh BaCO as a raw material 3 , Bi 2 o 3 , NaCO 3 , CaCO 3 ,TiO 2 , ZnO, Nb 2 o 5 and MnCO 3 , and finally obtain piezoelectric ceramics having a given formulation ratio as shown in Table 3, and uniformly mix them in a ball mill. Next, it is calcined at a temperature of 800-1,000° C. for 2 hours to form a compound. The compound is ground again in a ball mill, polyvinyl alcohol is added to the compound granules, and the mixture is granulated. The granulated powder was uniaxially compression molded under a pressure of 70 MPa to form a disc with a diameter of 13 mm, which was then heated at 1200-1400° C. for 2 hours. The disk-shaped sample was ground to a thickness of 0.3 mm, and Ag was baked and fused at 700° C. to condense on the sample disk to form electrodes thereon. Thereafter, the sample disk was subjected to polarization treatment by applying an electric field of 3...

Embodiment 3

[0051] A piezoelectric ceramic composition according to Example 3 was prepared as follows. First, weigh BaCO as a raw material 3 , Bi 2 o 3 , NaCO 3 , CaCO 3 ,TiO 2 , MnCO 3 , Y 2 o 3 , Dy 2 o 3 , Ho 2 o 3 and Yb 2 o 3 , and finally obtain piezoelectric ceramics with the preparation ratio shown in Table 5, and uniformly mix them in a ball mill. Next, it is calcined at a temperature of 800-1,000° C. for 2 hours to form a compound. The compound is ground again in a ball mill, polyvinyl alcohol is added to the compound granules, and the mixture is granulated. The granulated powder was uniaxially compression molded under a pressure of 70 MPa to form a disc with a diameter of 13 mm, which was then heated at 1200-1400° C. for 2 hours.

[0052] The disk-shaped sample was ground to a thickness of 0.3 mm, and Ag was baked and fused at 700° C. to condense on the sample disk to form electrodes thereon. Thereafter, the sample disk was subjected to polarization treatment b...

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Abstract

The present invention provides a piezoelectric ceramic composition which contains no lead and has piezoelectric characteristics suitable for practical use. The piezo-electric ceramic composition has a complex perovskite structure represented by the formula: (1-x-y-z)BaTiO3-x(Bi 1/2 Na 1/2 ) TiO3-yCaTiO3-zBa(Zn[1/3]Nb[2/3])O3 and comprises Ba, Ti, O, Bi, Na, Ca, Zn and Nb in the proportion satisfying the following conditions of x, y and z: 0.0 C04B 35/462 C04B 35/495 H01L 41/187 1 12 7 2001/11/15 1354155 2002/6/19 1142116 2004/3/17 2004/3/17 Matsushita Electric Industrial Co., Ltd. Japan Takahashi Keiichi Nishida Masamitsu hu jiaoyu 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2000/11/20 P2000-352935

Description

field of invention [0001] The present invention relates to a piezoelectric ceramic composition used for piezoelectric ceramic elements, in particular to a piezoelectric ceramic composition used for piezoelectric crystal resonators, piezoelectric vibrators, and piezoelectric elements used in sensors, actuators, buzzers, etc. things. Background of the invention [0002] A ceramic composition containing lead zirconate titanate (PZT) or lead titanate (PT) as a main component is widely used as a piezoelectric ceramic composition used in piezoelectric ceramic vibrators, piezoelectric ceramic In piezoelectric ceramic components of filters, piezoelectric buzzers, piezoelectric sensors and actuators. In order to improve the ceramic properties of the above composition, trace additives such as Mn, etc. can be added, or Sr or composite oxides such as Pb (Mg 1 / 3 Nb 2 / 3 )O 3 Substituting part of Pb to obtain piezoelectric ceramics with desired piezoelectric properties. [0003] On th...

Claims

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Application Information

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IPC IPC(8): C04B35/46C04B35/468C04B35/475H01L41/187
CPCC04B2235/3267C04B35/462C04B2235/768C04B2235/3201C04B2235/3284H01L41/187C04B2235/3215C04B35/4682C04B2235/3208C04B35/468C04B35/475C04B2235/3224C04B35/6262C04B2235/3255C04B2235/3225C04B2235/3234C04B2235/3236C04B2235/3298H10N30/853
Inventor 高桥庆一西田正光
Owner PANASONIC CORP
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