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Piezoelectric ceramic composition and piezoelectric device using the same

A technology of piezoelectric ceramics and piezoelectric devices, applied in piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric devices/electrostrictive devices, ceramics, etc., can solve low production efficiency, uneven voltage, diffusion major issues

Inactive Publication Date: 2003-07-09
株式会社爱思赛拉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Not only that, but there is another problem that when conventional piezoelectric components are polarized, the leakage current becomes large, and thus the voltage becomes uneven, resulting in large diffusion, and when producing this piezoelectric device, the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] The piezoelectric ceramic composition was prepared according to the following Table 1, and the piezoelectric ceramic composition was used to prepare samples for measuring corresponding piezoelectric properties.

[0041] PbO, TiO 2 , ZrO 2 , CoO, WO 3 and Cr 2 o 3 Used as a starting material, and the starting material and various additives were weighed according to the predetermined ratio in Table 1. Thereafter, using a ball mill, the starting materials and additives were thoroughly mixed for 24 hours. In addition, the MnO 2 added to the resulting mixture so that, based on the total weight of the piezoelectric components, the MnO 2 The amount is 0.4wt%.

[0042] The well mixed slurry was dried to form a dry powder with a particle size of 0.1 μm to 1.5 μm. When drying the slurry, the phases should not separate. If the slurry is separated into one or more layers, perovskite crystals cannot be formed not only in one phase, but also in another further formed phase (...

example 2

[0054] In addition to piezoelectric ceramic components including Pb[(Co 1 / 2 W 1 / 2 ) 0.01 Ti 0.48 Zr 0.48 ]O 3 , 2wt% Cr 2 o 3 And the MnO of the quantity in table 2 2 Otherwise, the procedure of Example 1 was repeated, and a sample was prepared using the piezoelectric ceramic composition. Measured with MnO 2 The leakage current of the content changes. The measurement results are shown in Table 2.

[0055] MnO 2 Content (wt%)

Leakage current (A)

33

0

0.54

34

0.1

0.28

35

0.3

0.06

36

0.5

0.45

37

0.7

0.79

38

0.9

1.20

[0056] As can be seen from the results in Table 2, by adding 0.1wt% to 0.5wt% MnO to the piezoelectric ceramic composition 2 Leakage current can be reduced. In addition, the piezoelectric ceramic composition according to the present invention has the advantage that even w...

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Abstract

Disclosed is a piezoelectric ceramic composition comprising a PZT piezoelectric composition, a B-site of which is substituted with a certain material, and chromium oxide, and a piezoelectric device using the piezoelectric ceramic composition. The piezoelectric ceramic composition has good heat resistance and frequency stability, and reduces a leakage current. There is provided the piezoelectric ceramic composition comprising a main component expressed by Pb[(Co1 / 2W1 / 2)xTi1-x-yZry]O3 (wherein, 0.001<=x<=0.04, and 0.35<=y<=0.55), Cr2O3 in an amount of 0.01 to 2 wt %, MnO2 in an amount of 0.1 to 0.5 wt %, and an additive in an amount of 0.01 to 2.0 wt %, based on the total weight of the piezoelectric ceramic composition, in which the additive is selected from the group consisting of CoO, MgO, ZnO, Al2O3, Fe2O3, Sb2O3, SnO2, CeO2, Nb2O5, V2O5 and WO3, and mixtures thereof. The piezoelectric ceramic composition satisfies piezoelectric properties such as kp and Qm needed for a piezoelectric material, and is 320 DEG C. or higher in phase transition temperature, +-30 ppm / DEG C. in TCF, and 0.1 % or less in oscillation frequency change after reflow; and the piezoelectric ceramic composition also has good piezoelectric properties such that the leakage current is reduced.

Description

technical field [0001] The present invention generally relates to piezoelectric ceramic compositions capable of reducing leakage current and piezoelectric devices using the piezoelectric ceramic compositions, and more particularly, the present invention relates to PZT piezoelectric B-lattice in which certain materials are substituted for PZT , and a piezoelectric ceramic composition in which chromium oxide is added, and a piezoelectric device using the piezoelectric ceramic composition. This piezoelectric ceramic composition has good heat resistance and frequency stability, and can reduce leakage current. Background technique [0002] Recently, piezoelectric sensors are widely used in ceramic resonators, ceramic filters, piezoelectric transducers, piezoelectric buzzers, ultrasonic oscillators, and the like. For example, kilohertz range SMD (Surface Mount Device) type filters, which are key components in current information technology, are commonly used in the production of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/472C04B35/493H10N30/20H10N30/853
CPCC04B2235/3267C04B2235/3296C04B35/493C04B2235/3249C04B2235/3258C04B2235/3241H01L41/1876C04B2235/3275H10N30/8554C04B35/472H10N30/853
Inventor 权相九许康宪洪钟国徐东焕
Owner 株式会社爱思赛拉
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