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Bi.Na.Ag Ba titanate series lead-free piezoelectric ceramics

A bismuth-sodium-silver titanate and piezoelectric ceramic technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve problems such as difficult polarization, and achieve excellent piezoelectric ferroelectric performance , good density, low calcination temperature and sintering temperature

Inactive Publication Date: 2006-08-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sodium bismuth titanate (Bi 0.5 Na 0.5 TiO 3 , referred to as BNT) is a lead-free environment-friendly piezoelectric ferroelectric ceramic material with a perovskite structure, which has a large remanent polarization (Pr=38μC / cm 2 ), but due to the high coercive electric field (Ec=73kV / mm), it is very difficult to polarize during fabrication, so it needs to be modified by doping to reduce its coercive field and make it easier to polarize to improve its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The preparation technological process that embodiment adopts and condition are:

[0013] According to the proportion of molecular formula, weigh the raw materials, use absolute ethanol as the medium, mix thoroughly by ball milling, put it into an alumina crucible, press it lightly, and calcine in the air at a temperature of 800-1000 ° C, holding time 2 ~4 hours. The powder synthesized by calcining is ground by a ball milling process, 10wt% binder (10wt% polyvinyl alcohol aqueous solution) is added to the dried powder, and molded under a pressure of 10-20Mpa. The molded blank is ejected at 500-800°C, and then sintered at 1100-1200°C for 2-4 hours. The sintered ceramic sheet is covered with a silver electrode, and polarized at a voltage of 3-4kV for 15-30 minutes in silicon oil at 60-120°C.

[0014] The test conditions adopted for the prepared lead-free piezoelectric ceramics are:

[0015] Test dielectric constant and dielectric loss: use HP 4278A impedance analyzer to...

Embodiment 1

[0019] According to the molecular formula [Bi 0.5 (Na 0.96 Ag 0.04 ) 0.5 ] 0.94 Ba 0.06 TiO 3 Proportioning raw materials and preparation process conditions are as mentioned above.

[0020] d 33 (pC / N)

Embodiment 2

[0022] According to the molecular formula [Bi 0.5 (Na 0.94 Ag 0.06 ) 0.5 ] 0.94 Ba 0.06 TiO 3 Proportioning raw materials and preparation process conditions are as mentioned above.

[0023] d 33 (pC / N)

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PUM

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Abstract

The invention relates to bismuth titanate natrium-silver-barium series piezoelectric ceramics with ABO3 structure. The general equation of the compound is [Bi0.5(Na1-xAgx)0.5] 1-yBayTiO3+aM alpha O beta (wt%), and in the equation, 0 alpha Obeta is one or plural doping oxide. The main constituent is 0-5 of Biw(Na1-x-y-zKxLiyAgz)1-wTiO3, M could be Na, K, Li, Ni, Zn, Cr, Co, Nb, Ta, Al, Cu, Fe, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, In, Y, Sc, La, Ho, Lu, Sn, Sb, Mn, Ca, Ba, Sr, Mg, Si, Bi, Ag, etc. Alpha and beta mean the M element and atomicity corresponding to the relative oxide. The sintering temperature is 1100-1200 degree centigrade, keeping for 1-4 hours. The optimal value of the compound of d33 could be over 160pC / N, kp could be over 31%, dielectric loss could be below 0.03. And the technology is stable, and it would be made from traditional technology and raw material.

Description

1. Technical field [0001] The invention relates to a new type of lead-free piezoelectric ceramics, which belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination. 2. Background technology [0002] Since the mid-1940s, after the piezoelectricity of barium titanate ceramics was discovered, the research and development of piezoelectric ceramics has been very active. At present, piezoelectric ceramics have been widely used in industry, especially in the field of information industry. The components produced have penetrated into people's daily life. [0003] However, in lead-based piezoelectric ceramic materials, PbO or Pb 3 o 4 The content of it accounts for about 70% of the total amount of raw materials. PbO or Pb 3 o 4 It is easy to volatilize at high temperature, so that lead-based piezoelectric ceramics will cause serious harm to human beings and the ecological environment in the process of production, use and disposal. In r...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/468C04B35/475H01L41/187
Inventor 肖定全吴浪赁敦敏朱建国余萍
Owner SICHUAN UNIV
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