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Lead-less lithium sodium potassium niobate piezoelectric ceramic with high curie point and its prepn

A lead-free piezoelectric and ceramic technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of staff health damage and surrounding environmental pollution

Inactive Publication Date: 2006-08-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And lead begins to volatilize at 800°C, which will also cause serious pollution to the surrounding environment and damage to the health of the staff.

Method used

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  • Lead-less lithium sodium potassium niobate piezoelectric ceramic with high curie point and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Formula: by the general formula (1-u)[(1-z)(Li x Na y K 1-x-y )NbO 3 +zMTiO 3 ]+uMnO 2 The lead-free piezoelectric ceramics indicated, when x=0.03, y=0.15, z=0, u=0, it is (Li 0.03 Na 0.15 K 0.82 )NbO 3

[0021] sintering

Embodiment 2

[0023] Formula: when x=0.03, y=0.25, z=0, u=0, it is (Li 0.03 Na 0.25 K 0.72 )NbO 3

[0024] The preparation process is as described above, and the performance parameters of the obtained lead-free piezoelectric ceramics are as follows:

[0025] sintering

Embodiment 3

[0027] Formula: when x=0.02, y=0.15, z=0, u=0, it is (Li 0.02 Na 0.15 K 0.83 )NbO 3

[0028] sintering

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Abstract

The present invention relates to lead-less piezoelectric ceramic composition and is especially one kind of lead-less Li-Na-K niobate piezoelectric ceramic and its preparation process. The lead-less piezoelectric ceramic composition of the present invention is expressed in the general expression of (1-u)[(1-z)(LixNayK1-x-y)NbO3+zMTiO3]+uMnO2, where, x, y and z are atom percentages of corresponding elements, x is 0.01-0.2, y is 0.2-0.7, z is 0.01-0.25, x+y+z=1, u is 0-0.05, and M is one bivalent metal ion selected from Ca, Mg, Ba and Sr. The lead-less piezoelectric ceramic composition is prepared through sintering at relatively low temperature, say, 1190 deg.c or even lower, and has good piezoelectric characteristic, practical plane electromechanical coupling coefficient kp, high Curie point and no lead and lead compound contained.

Description

1. Technical field [0001] The invention relates to a formulation and preparation process of a lead-free piezoelectric ceramic composition with excellent performance 2. Background technology [0002] Since the 1960s, PT(PbTiO 3 ) or PZT (Pb(Zr,Ti)O 3 ) as the main component of piezoelectric ceramic materials have been widely used in electronics, communications, aerospace, military and other fields. At present, this type of material is still the main material for the preparation of various piezoelectric ceramic filters, oscillators, resonators, frequency discriminators, traps and other electronic components. Although this type of material occupies a dominant position in the field of electronic component manufacturing because of its excellent dielectric and piezoelectric properties. However, there are still many disadvantages in the preparation and use of such materials: (1), the firing temperature of PT-based or PZT-based piezoelectric ceramic materials is relatively high, ...

Claims

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Application Information

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IPC IPC(8): C04B35/36C04B35/495C04B35/462C04B35/622H01L41/187
Inventor 朱建国陈强肖定全施小罗刘志潜何龙
Owner SICHUAN UNIV
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