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Piezoelectric ceramic composition and laminated piezoelectric element

A technology of piezoelectric ceramics and piezoelectric elements, applied in the field of laminated piezoelectric elements, can solve problems such as the influence of the reliability of piezoelectric ceramic composition products

Active Publication Date: 2007-04-11
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature range around 150°C is sometimes included in the product’s operating specification temperature range, and the resistance drop of the piezoelectric ceramic composition will seriously affect the reliability of the product

Method used

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  • Piezoelectric ceramic composition and laminated piezoelectric element
  • Piezoelectric ceramic composition and laminated piezoelectric element
  • Piezoelectric ceramic composition and laminated piezoelectric element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0222] An experiment for confirming the effect of adding the first subcomponent (MgO) will be described as Example 1.

[0223] In this experiment, Mg was added in the amount shown in FIG. 4 in terms of MgO with respect to the following main components, and the effect was examined.

[0224] Main component: (Pb 0.995-0.03 Sr 0.03 )[(Zn 1 / 3 Nb 2 / 3 ) 0.1 Ti 0.43 Zr 0.47 ]O 3

[0225] The piezoelectric ceramic composition was produced as follows. First, prepare PbO powder, SrCO 3 powder, ZnO powder, Nb 2 o 5 Powder, TiO 2 Powder, ZrO 2 The powder is used as the raw material of the main component, and weighed according to the composition of the above-mentioned main component. In addition, MgO was prepared as an additional species of Mg, and was added to the parent composition of the main component at the content shown in FIG. 4 . Next, these raw materials were wet-mixed for 16 hours using a ball mill, and precalcined at 700 to 900° C. in air for 2 hours.

[0226] Aft...

Embodiment 2

[0232] A sample was prepared in the same manner as in Example 1 except that a and Mg were added in the amounts shown in FIG. 7 in terms of MgO to the following main components. For the obtained sample, the electromechanical coupling coefficient kr (%) was measured in the same manner as in Example 1. The results are shown in FIG. 7 .

[0233] Main component: (Pb a-0.03 Sr 0.03 )[(Zn 1 / 3 Nb 2 / 3 ) 0.1 Ti 0.43 Zr 0.47 ]O 3

[0234] As shown in FIG. 7 , in the samples subjected to Cu paste printing, when a was in the range of 0.96 to 1.03, an electromechanical coupling coefficient kr (%) of 60% or more was obtained.

Embodiment 3

[0236] Samples were produced in the same manner as in Example 1 except that b and Mg were added in the amounts shown in FIG. 8 in terms of MgO to the following main components. For the obtained sample, the electromechanical coupling coefficient kr (%) was measured in the same manner as in Example 1. The results are shown in FIG. 8 .

[0237] Main component: (Pb 0.995-b Sr b )[(Zn 1 / 3 Nb 2 / 3 ) 0.1 Ti 0.43 Zr 0.47 ]O 3

[0238] As shown in FIG. 8 , it can be seen that the electromechanical coupling coefficient kr (%) can be increased by substituting Sr for Pb of the above-mentioned main component, and the substitution amount (molar ratio) of Sr is preferably 0.1 or less.

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Abstract

For the purpose of preventing the degradation of the piezoelectric strain properties when Cu is used for internal electrodes, there is provided a piezoelectric ceramic composition including: a composite oxide, as a main constituent thereof, represented by (Pb a - b Me b ) [(Zn 1 / 3 Nb 2 / 3 ) x Ti y Zr z ]O 3 with the proviso that 0.96<=a<=1.03, 0<=b<=0.1, 0.05<=x<=0.15, 0.25<=y<=0.5, 0.35<=z<=0.6, and x + y + z = 1, and Me represents at least one selected from Sr, Ca and Ba; and at least one selected from Co, Mg, Ni, Cr and Ga as a first additive to the main constituent in a content of 0.5% by mass or less (not inclusive of 0) in terms of oxide, wherein an electrode made of Cu is to be disposed on the piezoelectric ceramic composition.

Description

technical field [0001] The present invention relates to a piezoelectric ceramic composition suitable for piezoelectric layers of various piezoelectric elements such as actuators, piezoelectric buzzers, sounding bodies, and sensors, and particularly relates to a piezoelectric ceramic composition that is also suitable for use of Cu in internal electrodes. A piezoelectric ceramic composition for a piezoelectric layer of a multi-layer piezoelectric element, and a multi-layer piezoelectric element using the composition. Background technique [0002] A piezoelectric ceramic composition used in a piezoelectric element is required to have a large piezoelectric characteristic, especially a large piezoelectric deformation constant. As a piezoelectric ceramic composition satisfying this characteristic, for example, lead titanate (PbTiO 3 ) and lead zirconate (PbZrO 3 ), and lead zinc niobate [Pb(Zn 1 / 3 Nb 2 / 3 )O 3 ] composed of a ternary system piezoelectric ceramic composition; a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/493H01L41/187H01G4/12H01G4/30C04B35/491H01L41/083H01L41/22H01L41/273H01L41/43
Inventor 家住久美子山崎纯一塚田岳夫坂本典正曾我部智浩七尾胜
Owner TDK CORPARATION
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