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Potassium-bismuth titanate-based solid solution lead-free piezoelectric ceramic and manufacturing method thereof

A bismuth potassium titanate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of unstable crystal structure and no bismuth potassium titanate And bismuth-based perovskite solid solution lead-free piezoelectric ceramics electrical properties and preparation technology to achieve good piezoelectric and electromechanical coupling performance, good piezoelectric performance

Inactive Publication Date: 2011-02-16
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the crystal structure of the latter is unstable, when it forms a solid solution with the stable BKT composition, it is expected to obtain the composition of a single perovskite structure and form the traditional quasi-isotropic phase boundary located in the rhombohedral and tetragonal ferroelectric phases. , but there is no research report on the electrical properties and preparation process of bismuth potassium titanate and bismuth-based perovskite solid solution lead-free piezoelectric ceramics in the existing literature

Method used

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  • Potassium-bismuth titanate-based solid solution lead-free piezoelectric ceramic and manufacturing method thereof
  • Potassium-bismuth titanate-based solid solution lead-free piezoelectric ceramic and manufacturing method thereof
  • Potassium-bismuth titanate-based solid solution lead-free piezoelectric ceramic and manufacturing method thereof

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Experimental program
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preparation example Construction

[0053] The specific steps of the preparation method are:

[0054] 1. From MgO, ZnO, CoO, NiO, TiO 2 , ZrO 2 , Nb 2 o 5 , WO 3 Select the raw material in, according to the chemical formula C 2x D. 2y o 3 Ingredients;

[0055] 2. The prepared raw materials are mixed by ball milling for 6-12 hours with absolute ethanol as the medium, and after drying, they are calcined in an alumina crucible at a temperature of 1200-1450°C for 1-4 hours;

[0056] 3. Synthesized C 2x D. 2y o 3 and K again 2 CO 3 , Bi 2 o 3 ,TiO 2 , Fe 2 o 3 , Sc 2 o 3 , Y 2 o 3 , In 2 o 3 Raw materials such as, carry out batching according to general formula (1);

[0057] 4. The prepared raw materials are mixed by ball milling for 6-12 hours with absolute ethanol as the medium, and after drying, they are calcined in an alumina crucible at a temperature of 850-1000°C for 1-4 hours;

[0058] 5. After the pre-synthesized powder is ground, it is still finely ground for 22-23 hours with absolut...

Embodiment 1

[0065] Carry out each step successively according to above-mentioned embodiment mode, wherein,

[0066] Using (1-n){(1-u)(Bi 0.5 K 0.5 )TiO 3 +u[(1-z)Bi((Mg 0.5 Ti 0.5 )O 3 +zBiScO 3 ]}+nCuO composed of piezoelectric ceramics, the first step of calcination temperature is 1400 ℃, time is 4 hours, the second step calcination temperature is 900 ℃, time is 3 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. The formed green body was then sintered at 1100° C. for 2 hours.

[0067] When u = 0.12, z = 0.05 and n = 0.005, the scanning electron micrograph of the sample after sintering at 1100 ° C for 2 hours is as follows figure 1 shown.

[0068]When u=0.12, z=0.05 and n=0.005, the sample was sintered at 1100°C for 2 hours, and the dielectric-temperature curve at 1MHz is as follows figure 2 shown.

[0069] When z=0.05 and n=0.005, and u are 0.12 and 0.4 respectively, the X-ray diffraction pattern of the sample is a...

Embodiment 2

[0074] Carry out each step successively according to above-mentioned embodiment mode, wherein

[0075] Using (1-n){(1-u)(Bi 0.5 K 0.5 )TiO 3 +u[(1-z)Bi((Ni 2 / 3 Nb 1 / 3 )O 3 +zBiFeO 3 ]}+nAgO is composed of piezoelectric ceramics, when u=0.1, z=0.03, and n is 0 and 0.005 respectively, the first step of calcination temperature is 1350 ℃, time is 4 hours, the second The step calcination temperature is 920° C. and the time is 3 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. The X-ray diffraction pattern of the formed green body after sintering at 1050°C for 2 hours is shown in Fig. Figure 4 shown.

[0076] When u=0.1, z=0.03, and n=0, the sample was sintered at 1050°C for 2 hours, and other relevant physical property data are listed in Table 2:

[0077] Table 2

[0078]

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Abstract

The invention discloses a potassium-bismuth titanate-based solid solution lead-free piezoelectric ceramic and a manufacturing method thereof. The components are represented by the general formula of (1-n){(1-u)(Bi0.5K0.5)TiO3+u[(1-z)Bi(CxDy)O3+zBiEO3]}+nM. The ceramic components of the invention have a morphotropic phase boundary of the rhombic ferroelectric phase and the cubic ferroelectric phase, good piezoelectric performance and higher Curie temperature. The ceramic components have the characteristic of environmental protection, can realize the replacement of a part of the traditional lead-containing piezoelectric ceramics, and can be manufactured by using the manufacturing method of the traditional piezoelectric ceramic and the industrial materials, thereby having practical application.

Description

technical field [0001] The invention relates to lead-free piezoelectric ceramics and a preparation method thereof, more specifically to bismuth potassium titanate-based solid solution lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are an important class of functional ceramic materials. However, the piezoelectric ceramic materials commonly used for many years are mainly based on lead zirconate titanate (Pb(Zr,Ti)O 3 ) as the main component, wherein the content of lead oxide or trilead tetroxide accounts for more than 60% of the raw material. These lead-containing piezoelectric ceramics will bring serious harm to human health and the living environment during use and disposal. The development of lead-free and environmentally compatible piezoelectric ceramics is an urgent and practical topic. [0003] The lead-free piezoelectric ceramics reported in the current literature mainly include barium titanate-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622H01L41/187C04B35/475H10N30/853
Inventor 左如忠赵万里齐世顺付健
Owner HEFEI UNIV OF TECH
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