Unleaded piezoelectric ceramic consisting of B-site composite Bi-based compound and preparation method thereof

A lead-free piezoelectric and compound technology is applied in the field of piezoelectric ceramic materials, which can solve the problems of unreported B-site composite Bi, and achieve the effects of improving composition uniformity, simple preparation process and excellent piezoelectric performance.

Inactive Publication Date: 2013-10-30
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing literature has not reported the B-site complex Bi (Li 1 / 2 Me 1 / 2 )O 3 Report on Pb-based Piezoelectric Ceramics and Its Preparation Method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation ingredients are: (1- x - y - v ) Bi (Li 1 / 2 Me 1 / 2 )O 3 - x BaTiO 3 - y (Na 1 / 2 Bi 1 / 2 )TiO 3 - v (K 1 / 2 Bi 1 / 2 )TiO 3 + z m a o b ,in x =0.03, y =0.80, v =0.10, z =0.01, Me=Nb, M=Dy. Lead-free piezoelectric ceramics composed of B-site composite Bi-based compounds

[0027] The preparation method comprises the following steps:

[0028] To analyze pure Bi 2 o 3 、Na 2 CO 3 、BaCO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、Dy 2 o 3 and TiO 2 as raw materials, respectively according to the following chemical formula:

[0029] Bi (Li 1 / 2 Nb 1 / 2 )O 3 , BaTiO 3 , (Na 1 / 2 Bi 1 / 2 )TiO 3 , (K 1 / 2 Bi 1 / 2 )TiO 3

[0030] For batching, use absolute ethanol as a medium for high-energy ball milling for 10 hours, dry at 80°C, and then hold at 750°C for 2 hours to pre-synthesize Bi (Li 1 / 2 Nb 1 / 2 )O 3 , pre-synthesized BaTiO at 950°C for 2 hours 3 , pre-synthesized at 850°C for 2 hours (Na 1 / 2 Bi 1 / 2 )TiO 3 , pre-synthesi...

Embodiment 2

[0036] The preparation ingredients are: (1- x - y - v ) Bi (Li 1 / 2 Me 1 / 2 )O 3 - x BaTiO 3 - y (Na 1 / 2 Bi 1 / 2 )TiO 3 - v (K 1 / 2 Bi 1 / 2 )TiO 3 + z m a o b ,in x =0.03, y =0.08, v =0.85, z =0.01, Me=60%Nb+40%Sb, M=In. B-site composite Bi-based compound composed of lead-free piezoelectric ceramics

[0037] The preparation method is the same as in Example 1, the sintering temperature is 1100°C, and the hot pressing sintering temperature is 680°C.

[0038] The performance measurements are as follows:

[0039] d 33 (pC / N) Q m k p ε r tanδ(%) k t 114 198 0.18 755 4.43 0.16

Embodiment 3

[0041] The preparation ingredients are: (1- x - y - v ) Bi (Li 1 / 2 Me 1 / 2 )O 3 - x BaTiO 3 - y (Na 1 / 2 Bi 1 / 2 )TiO 3 - v (K 1 / 2 Bi 1 / 2 )TiO 3 + z m a o b ,in x=0.88, y =0.03, v =0.06, z =0.01, Me=90%Nb+10%Sb, M=Ce. B-site composite Bi-based compound composed of lead-free piezoelectric ceramics

[0042] The preparation method is the same as in Example 1, the sintering temperature is 1200°C, the holding time is 6 hours, the hot pressing sintering temperature is 750°C, and the holding time is 30 minutes.

[0043] The performance measurements are as follows:

[0044] d 33 (pC / N) Q m k p ε r tanδ(%) k t 185 206 0.26 942 1.78 0.36

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Abstract

The invention discloses an unleaded piezoelectric ceramic consisting of a B-site composite Bi-based compound and a preparation method thereof. The components of the unleaded piezoelectric ceramic are shown by the general formulae of (1-x) Bi (Li1 / 2Me1 / 2) O3 - xBaTiO3 + zMaOb, (1-x) Bi (Li1 / 2Me1 / 2)O3 - x (Na1 / 2Bi1 / 2)TiO3 + zMaOb, (1-x-y) Bi (Li1 / 2Me1 / 2) O3 - xBaTiO3 - y (Na1 / 2Bi1 / 2) TiO3 + zMaOb, (1-x-y) Bi (Li1 / 2Me1 / 2) O3 - xBaTiO3 - y (K1 / 2Bi1 / 2) TiO3, + zMaOb or (1-x-y-v) Bi (Li1 / 2Me1 / 2) O3 - xBaTiO3 - y (Na1 / 2Bi1 / 2) TiO3 - v(K1 / 2Bi1 / 2) TiO3 + zMaOb, wherein x, y, z and v denote mole fractions, 0 (x (1.0,0 (y (1,0 (v (1, 0< / = z< / =0.1, Me represents one or five pentavalent metallic elements, MaOb represents one or a plurality of oxides, M is an element of +1 to +6 valence, and can be formed into a solid oxide with oxygen, and the ceramic is prepared in a conventional ceramic preparation method. The prepared unleaded piezoelectric ceramic has a good sintering characteristic, the preparation process is simple and stable, the performance is excellent, and the unleaded piezoelectric ceramic can partially replace the conventional lead based piezoelectric ceramic to be used.

Description

technical field [0001] The invention relates to a piezoelectric ceramic material, in particular to a lead-free piezoelectric ceramic composed of a B-site composite Bi-based compound and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are widely used in high-tech fields such as information, laser, navigation, electronic technology, communication, measurement and detection, precision processing and sensing technology. However, most of the current practical piezoelectric ceramics are lead zirconate titanate (PZT) or lead zirconate titanate-based materials, and the content of lead oxide in these materials accounts for about 70%. Actively prohibit lead-containing electronic products through laws, regulations, and government directives. Therefore, the task of researching high-performance, low-cost, and practical lead-free piezoelectric and ferroelectric materials is very urgent. [0003] In the lead-free piezoelectric ceramic system currently ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/468C04B35/622
Inventor 周沁杨华斌周昌荣成钧袁昌来陈国华
Owner GUILIN UNIV OF ELECTRONIC TECH
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