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Multi-element sodium-potassium niobate series lead-free piezoelectric ceramic and preparing method

A potassium sodium niobate, lead-free piezoelectric technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of insufficient electrical performance and distance , to achieve excellent piezoelectric and electromechanical coupling properties, inhibit grain growth, and increase sintered density

Inactive Publication Date: 2007-08-29
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of ceramic is difficult to sinter under the conventional preparation process, and it is easy to be hydrolyzed, so that its electrical properties cannot be fully exerted
[0005] The above two lead-free material systems are the lead-free piezoelectric candidate materials that have been studied more and have great potential. However, due to their inherent shortcomings, there is still a distance from the actual application.
There is no research report on the electrical properties and preparation process of the piezoelectric ceramic composition composed of these two typical lead-free piezoelectric materials in the existing literature.

Method used

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  • Multi-element sodium-potassium niobate series lead-free piezoelectric ceramic and preparing method
  • Multi-element sodium-potassium niobate series lead-free piezoelectric ceramic and preparing method

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Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0044] In step 1, take values ​​according to x=0, z=0.03, w=0.5, f=0, g=0, u=0, n=0, t1=0 and t2=0,

[0045] The general formula of the composition is expressed as: 0.97 (Na 0.5 K 0.5 )NbO 3 +0.03(Bi 0.5 K 0.5 )TiO 3

[0046] In step 2, the calcination temperature is 900°C, and the calcination time is 5 hours;

[0047] In step 4, the sintering temperature of the green body is 1080° C., and the sintering time is 2 hours.

[0048] The scanning electron microscope photo of the obtained natural surface of the sample is shown in Figure 1, the dielectric-temperature characteristic curve of the sample is shown in Figure 4, and other relevant physical performance data:

[0049] Density (g / cm 2 ) Grain size (μm) ε 33 / ε o (1kHz) d 33 (pC / N)k p (%)

[0050] 4.31 3.2 850 191 45

Embodiment 2

[0051] Embodiment 2: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0052] In step 1, take values ​​according to x=1, z=0.02, w=0.5, u=0, n=0, g=0, f=0, t1=0 and t2=0,

[0053] The general formula of the composition is expressed as: 0.98 (Na 0.5 K 0.5 )NbO 3 +0.02(Bi 0.5 Na 0.5 )TiO 3

[0054] In step 2, the calcination temperature is 850°C, and the calcination time is 5 hours;

[0055] In step 4, the sintering temperature of the green body is 1090° C., and the sintering time is 2 hours.

[0056] The scanning electron microscope photo of the obtained natural surface of the sample is shown in Figure 2, the dielectric-temperature characteristic curve of the sample is shown in Figure 5, and other relevant physical performance data:

[0057] Density (g / cm 2 ) Grain size (μm) ε 33 / ε o (1kHz) d 33 (pC / N)k p (%)

[0058] 4.33 2.2 600 185 43

Embodiment 3

[0059] Embodiment 3: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0060] In step 1, values ​​are selected according to x=1, z=0.0192, w=0.5, u=0, n=0.0008, g=0, f=0, t1=0.025 and t2=0.025,

[0061] The general formula of the composition is expressed as: 0.98 (Na 0.475 K 0.475 Li 0.05 )NbO 3 +0.02(Bi 0.48 Na 0.48 Ba 0.04 )TiO 3

[0062] In step 2, the calcination temperature is 950°C, and the calcination time is 5 hours;

[0063] In step 4, the sintering temperature of the green body is 1080° C., and the sintering time is 2 hours.

[0064] The scanning electron microscope photo of the obtained natural surface of the sample is shown in Figure 3, the dielectric-temperature characteristic curve of the sample is shown in Figure 6, and other relevant physical performance data:

[0065] Density (g / cm 2 ) Grain size (μm) ε 33 / ε o (1kHz) d 33 (pC / N)k p (%)

[0066] 4.36 2.5 700 235 47

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Abstract

The invention relates to a multielement potassium niobate natrium series leadless piezoelectric ceramics and the manufacturing method. It is expressed by the general equation: (1-u)[(1-z-n)(LitNa1-w-t1Kw-t2)(Nb1-g-fTagSbf)O3+ z(Bi0.5Na0.5xK0.5 (1-x))TiO3+nBaTiO3]+uM. The invention has stable manufacturing technology and has great usefulness.

Description

technical field [0001] The present invention relates to lead-free piezoelectric ceramic composition and preparation method thereof, more specifically relate to a kind of sodium bismuth titanate ((Bi 0.5 Na 0.5 )TiO 3 ), potassium bismuth titanate (((Bi 0.5 K 0.5 )TiO 3 )), barium titanate (BaTiO 3 ) and sodium potassium niobate ((Na.K)NbO 3 ) formed solid solution lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] Piezoelectric ceramics, as the most widely used material in the field of functional ceramics, have pervaded every corner of people's daily life, and have a large number of military applications. Such as various filters, oscillators, notch filters and other electronic components made of piezoelectric ceramics. However, for many years these piezoelectric ceramic materials mainly use lead zirconate titanate (Pb(Zr,Ti)O3) as the main component. Wherein the content of lead oxide or lead trioxide accounts for more th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495H01L41/187H10N30/853
Inventor 左如忠
Owner HEFEI UNIV OF TECH
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