Leadless piezoelectric ceramics and method for preparing the same

A lead-free piezoelectric and ceramic technology, used in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc.

Inactive Publication Date: 2008-12-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Leadless piezoelectric ceramics and method for preparing the same
  • Leadless piezoelectric ceramics and method for preparing the same
  • Leadless piezoelectric ceramics and method for preparing the same

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Embodiment 1

[0022] The first step: first determine the value of x, here x=0.01, 0.02, 0.03, 0.04, 0.05. According to the chemical formula 0.94BNT-(0.06-x)BT-xKNN, for each determined value of x, that is, each component, weigh the dried Bi with a purity greater than 99.0% 2 o 3 、Na 2 CO 3 、TiO 2 、BaCO 3 , Nb 2 o 5 and K with a purity of 98.0% 2 CO 3 Raw powder. After considering the purity, the weight of each original powder corresponding to each component is as follows (unit: gram):

[0023] Bi 2 o 3

Na 2 CO 3

TiO 2

BaCO 3

K 2 CO 3

Nb 2 o 5

x＝0.01

10.0607

2.5223

7.9900

0.9967

0.0353

0.1329

x＝0.02

10.0607

2.5489

7.9093

0.7973

0.0705

0.2658

x＝0.03

10.0607

2.5754

7.8286

0.5980

0.1058

0.3988

x＝0.04

10.0607

2.6020

7.7479

0.3987

0.1410

0.5317

x＝0.05

10.0607

2.6285

7.66...

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Abstract

The invention discloses a leadless piezoelectric ceramics and a corresponding preparation method. The chemical formula of the leadless piezoelectric ceramics is as follows: 0.94Bi0.5Na0.5TiO3-(0.06-x)BaTiO3-xK0.5Na0.5NbO3, wherein, x is larger than 0 and less than 0.06. The leadless piezoelectric ceramics is manufactured through a solid state reaction method, and the structure of the ceramics is similar to a tripartite-orthogonal morphotropic phase boundary and has better ferroelectric and piezoelectric capability, and a residual polarization is about 30 Mu C/cm<2> and a saturation polarization is about 40 Mu C/cm<2> without depending on the contents, and the coercive field alters from 4.2 to 5.5kV/mm and increases as the increase of parameter x; and a piezoelectric coefficient d33 and an electro-mechanical coupling factor Kp decrease as the increase of parameter x, d33 alters from 86 to 118pC/N and kp alters from 0.26 to 0.29. A depolarization temperature (T<d>) increases from 108 to 146 DEG C as the increase of KNN.

Description

1. Technical field [0001] The invention relates to a novel lead-free piezoelectric ceramic 0.94Bi 0.5 Na 0.5 TiO 3 -(0.06-x)BaTiO 3 -xK 0.5 Na 0.5 NbO 3 , wherein 0<x<0.06, in addition, the invention also provides a preparation method of the ceramic. 2. Background technology [0002] Piezoelectric materials are an important class of applied functional materials, which are widely used in high-tech fields such as information, laser, and navigation. ABO-based 3 Pb(Zr 1-x Ti x )O 3 Ceramics have excellent piezoelectric properties and are piezoelectric materials that have been widely used in industry. However, since such materials contain lead, the toxicity of lead will cause serious harm to the human body and the natural environment after the production, use and disposal of the product, which is contrary to the sustainable development strategy. Therefore, the trend of industrial applications must be to use lead-free piezoelectric ceramics to replace the current...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622H01L41/187
Inventor 张善涛王磊庞凌华丁潞奕陈延峰
Owner NANJING UNIV
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