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Ternary system sodium-bismuth titanate lead-free piezoelectric ceramics

A technology based on lead-free piezoelectric and sodium bismuth titanate, applied in the field of piezoelectric ceramic materials, to achieve the effect of stable preparation process and excellent piezoelectric performance

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, currently in (Bi 1 / 2 Na 1 / 2 ) TiO 3 -(Bi 1 / 2 K 1 / 2 ) TiO 3 Lead-free piezoelectric ceramics with Bi-based compounds added as the third component in the binary system have not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] By Bi 2 o 3 、Na 2 CO 3 、K 2 CO 3 , Fe 2 o 3 and TiO 2 as raw material, according to the chemical formula

[0012] 0.81 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.18 (Bi 1 / 2 K 1 / 2 )TiO 3-0.01BiFeO 3

[0013] Carry out batching, wet grinding with absolute ethanol as the medium, and pre-synthesize the ceramic material at 850°C for 2 hours after drying; the ceramic material is dried by ball milling for the second time, added with binder to form, and sintered at 1150°C for 3 hours; after sintering The ceramic 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 4-5kV / mm, and the polarization time is 10min;

[0014] performance:

[0015] d 33 (pC / N) Q m k p ε r tanδ(%) ρ(g / m 3 )

[0016] 152 120 0.323 863 3.17 5.68

Embodiment 2

[0018] Preparation method is the same as embodiment 1, composition expression:

[0019] 0.83 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.12 (Bi 1 / 2 K 1 / 2 )TiO 3 -0.05BiFeO 3

[0020] performance:

[0021] d 33 (pC / N) Q m k p ε r tanδ(%) ρ(g / m 3 )

[0022] 162 108 0.341 943 3.35 5.72

Embodiment 3

[0024] Preparation method is the same as embodiment 1, composition expression:

[0025] 0.79 (Bi 1 / 2 Na 1 / 2 )TiO 3 -0.20 (Bi 1 / 2 K 1 / 2 )TiO 3 -0.01BiMnO 3

[0026] performance:

[0027] d 33 (pC / N) Q m k p ε r tanδ(%) ρ(g / m 3 )

[0028] 165 178 0.334 794 2.11 5.74

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PUM

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Abstract

The invention discloses a triple system (Na,Bi)TiO3-based lead-free piezoelectric ceramic material, the formula of the disclosed lead-free piezoelectric ceramic component is denoted with (1-x-y)(Bi0.5Na0.5)TiO3-x(Bi0.5K0.5)TiO3-yBi(Me)O3 and (1-x-y)(Bi0.5Na0.5)TiO3-x(Bi0.5K0.5)TiO-yBi(Me)O3+zM(a)O(b), in the formula x,y and z denote molar fractions, wherein x is bigger than or equal to 0 and smaller than or equal to 1.0, y is bigger than or equal to 0 and smaller than or equal to 0.2, z is bigger than or equal to 0 and smaller than or equal to 0.1, Me is trivalent metal element, M(a)O(b) is one or more oxides, wherein M is +1 to +6 valence and is an element that can be integrated with oxygen to form a solid oxide. The lead-free piezoelectric ceramic has high ceramic density and excellent performance, piezoelectric constant d33 can reach above 180pC per N, Kp can reach above 0.36. The lead-free piezoelectric ceramic adopts traditional electronic ceramic preparation process, and has low sintering temperature, simple and stable manufacture process and is suitable for industrialization production.

Description

1. Technical field [0001] The present invention relates to piezoelectric ceramic material, specifically in (Bi 1 / 2 Na 1 / 2 )TiO 3 -(Bi 1 / 2 K 1 / 2 )TiO 3 Bi-based compounds are added to the binary system as the lead-free piezoelectric ceramics of the third component. 2. Background technology [0002] Piezoelectric ceramics are important functional materials to realize mutual conversion between mechanical energy and electric energy. They are widely used in electronic technology, laser technology, communication, aerospace, metrology and detection, precision machining and sensing technology, especially in the detection, transformation and processing of information. Information technology areas such as storage and storage play an extremely important role. 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. At present, most practical piezoelectric cera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/475H01L41/16
Inventor 周昌荣刘心宇
Owner GUILIN UNIV OF ELECTRONIC TECH
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