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Titanium niobic zincic acid bismuth sodium system leadless piezo-electric ceramic and preparation method thereof

A titanium-niobium-bismuth-zincate-sodium-based, lead-free piezoelectric technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems that the preparation method has not been reported, and achieve a Practicality, process stability, strong anisotropy effect

Inactive Publication Date: 2008-06-18
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is no report on the lead-free piezoelectric ceramics of the NBT-based titanium niobium zincate sodium bismuth zincate system substituted by the B-site compound ion and its preparation method.

Method used

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  • Titanium niobic zincic acid bismuth sodium system leadless piezo-electric ceramic and preparation method thereof
  • Titanium niobic zincic acid bismuth sodium system leadless piezo-electric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] With ZnO and Nb 2 o 5 As raw material, according to the chemical formula ZnNb 2 o 6 Perform batching, wet grinding with absolute ethanol as the medium, and synthesize ZnNb at 950-1100°C after drying 2 o 6 , ZnNb was obtained after grinding and sieving 2 o 6 Powder; ZnNb 2 o 6 、 Bi 2 o 3 、Na 2 CO 3 and TiO 2 As a raw material, according to the chemical formula (Na 1 / 2 Bi 1 / 2 ) Ti 1-x (Zn 1 / 3 Nb 2 / 3 ) x o 3 , x=0.01 (mole fraction), carry out batching, wet grinding with absolute ethanol as the medium, synthesize ceramic material at 950°C after drying; add binder to the porcelain material, and sinter at 1170°C for 3 hours; the ceramic material after sintering The sheet is ground to 1.00±0.02mm with sandpaper, covered with silver on both sides, and polarized in 80°C silicone oil after firing the silver. The polarization electric field is 4kv / mm, and the polarization time is 10min;

[0024] performance:

[0025] d 33 (pC / N)K t K p ε r t...

Embodiment 2

[0028] The preparation method is the same as in Example 1, but the synthesis temperature in the second step is 900°C, the sintering temperature is 1150°C, and the composition expression: (Na 1 / 2 Bi 1 / 2 ) Ti 0.98 (Zn 1 / 3 Nb 2 / 3 ) 0.02 o 3

[0029] performance:

[0030] d 33 (pC / N)K t K p ε r tanδ(%) ρ(g / m 3 )

[0031] 101 0.46 0.14 625 2.93 5.64

Embodiment 3

[0033] The preparation method is the same as in Example 1, but the second step is synthesized with ZnNb 2 o 6 、 Bi 2 o 3 、Na 2 CO 3 、BaCO 3 and TiO 2 As the raw material, the synthesis temperature of the second step is 1000°C, the sintering temperature is 1200°C, the polarization temperature is 60°C, the polarization electric field is 6kv / mm, and the polarization time is 15min;

[0034] Composition expression: (Na 1 / 2 Bi 1 / 2 ) 0.97 Ba 0.03 Ti 0.99 (Zn 1 / 3 Nb 2 / 3 ) 0.01 o 3

[0035] performance:

[0036] d 33 (pC / N) K t K p ε r tanδ(%) ρ(g / m 3 )

[0037] 128 0.45 0.15 598 3.15 5.73

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Abstract

The invention discloses a triple system (Na,Bi)TiO3-NiO3-ZiO3-based lead-free piezoelectric ceramic material and preparation method, the B digital ion in the (Na0.5Bi0.5)TiO3 of the ABO3 type perovstike structure is replaced partially by composite ion (Zn(one-third)Nb(two-third))4+ and the A digital ion (Na0.5Bi0.5)2+ is replaced by Ba2+ to form lead-free piezoelectric ceramic that can be denoted with the formula ((Na0.5Bi0.5)Ti(1-x)(Zn(one-third)Nb(two-third))(x)O3)(+Z)M(a)O(b) and ((Na0.5Bi0.5)(1-y)Ba(y)Ti(1-x)(Zn(one-third)Nb(two-third))(x)O3)(+Z)M(a)O(b), wherein M(a)O(b) is one or more oxide. The piezoelectric ceramic adopts two-step synthetic method and is obtained by sintering. The lead-free piezoelectric ceramic has high ceramic density and excellent performance, piezoelectric constant d33 can reach above 150pC per N, Kt can reach above 0.50, and Kp can be below 0.20. The lead-free piezoelectric has strong anisotropy, simple and stable manufacture process and is suitable for industrialization production.

Description

1. Technical field [0001] The invention relates to piezoelectric ceramic materials, in particular to lead-free piezoelectric ceramics based on bismuth sodium titanium niobate zincate and a preparation method thereof. 2. Background technology [0002] Piezoelectric ceramics are an important functional material that can realize the conversion between mechanical energy and electrical energy, and have important applications in various aspects such as machinery, electronics, and communication. Since the discovery of the piezoelectricity of barium titanate ceramics in the mid-1940s, ABO 3 The research on piezoelectric ceramics with perovskite structure is very active. However, the current research and production of piezoelectric ceramics mainly focus on the traditional lead zirconate titanate (PZT)-based multi-element lead-containing ceramics. Because lead-containing piezoelectric ceramics will pollute the environment during the process of preparation, use and disposal. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462H01L41/187H10N30/853
Inventor 周昌荣刘心宇
Owner GUILIN UNIV OF ELECTRONIC TECH
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