Zinc-bismuth based perovskite-lead titanate-lead based relaxor ferroelectric ternary system piezoceramics and preparation method thereof

A technology of piezoelectric ceramics and perovskite, which is applied in the field of electronic component manufacturing to achieve the effects of low lead content, lower sintering temperature, and excellent piezoelectric performance

Inactive Publication Date: 2012-01-18
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

Some bismuth-based composite perovskites are important lead-free ferroelectric materials, which play an important role in the research of lead-free piezoelectric ceramics, especially the perovskite materials whose B site is a zinc-containing compound atom has stronger properties than PT. The tetragonality of the piezoelectric material can form a new quasi-isomorphic phase boundary with the lead-based relaxor ferroelectric material, and at the same time, it is expected to increase the Curie temperature of the piezoelectric material and reduce the lead content in it. Unfortunately, there is no such thing in the existing literature. Research Report on Electrical Properties and Preparation Process of Zinc-Bismuth-Based Composite Perovskite, Lead Titanate and Pb-Based Relaxor Ferroelectric Materials Solid Solution Piezoelectric Ceramics

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  • Zinc-bismuth based perovskite-lead titanate-lead based relaxor ferroelectric ternary system piezoceramics and preparation method thereof
  • Zinc-bismuth based perovskite-lead titanate-lead based relaxor ferroelectric ternary system piezoceramics and preparation method thereof
  • Zinc-bismuth based perovskite-lead titanate-lead based relaxor ferroelectric ternary system piezoceramics and preparation method thereof

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Embodiment 1

[0048] Carry out each step sequentially according to the above-mentioned embodiment mode, the general composition formula of the piezoelectric ceramic of the present embodiment is:

[0049] 0.05PbTiO 3 +0.05Bi(Zn 2 / 3 Nb 1 / 3 )O 3 +0.9Pb(Zn 1 / 3 Nb 2 / 3 )O 3 .

[0050] In step 2, the calcination temperature is 850° C., and the calcination time is 2 hours.

[0051] In step 3, the wet ball milling time is 12 hours.

[0052] In step 4, the sintering temperature is 1050° C., and the sintering time is 2 hours.

[0053] The scanning electron micrograph of the natural surface of the piezoelectric ceramic prepared in this embodiment is as follows: figure 1 As shown, other physical properties of the sample were measured: the Curie temperature was 230° C., the dielectric constant was 1170 (1 kHz), the piezoelectric constant was 550 pC / N, and the planar electromechanical coupling coefficient was 68%.

Embodiment 2

[0055] Carry out each step sequentially according to the above-mentioned embodiment mode, the general composition formula of the piezoelectric ceramic of the present embodiment is:

[0056] 0.995[0.05PbTiO 3 +0.05Bi(Zn 2 / 3 Nb 1 / 3 )O 3 +0.9Pb(Zn 1 / 3 Nb 2 / 3 )O 3 ]+0.005CuO.

[0057] In step 2, the calcination temperature is 850° C., and the calcination time is 2 hours.

[0058] In step 3, the wet ball milling time is 12 hours.

[0059] In step 4, the sintering temperature is 1020° C., and the sintering time is 2 hours.

[0060] The physical properties of the piezoelectric ceramics prepared in this embodiment: the Curie temperature is 232° C., the dielectric constant is 1010 (1 kHz), the piezoelectric constant is 500 pC / N, and the planar electromechanical coupling coefficient is 65%.

Embodiment 3

[0062] Carry out each step sequentially according to the above-mentioned embodiment mode, the general composition formula of the piezoelectric ceramic of the present embodiment is:

[0063] 0.2PbTiO 3 +0.2Bi(Zn 0.5 Ti 0.5 )O 3 +0.6Pb(Mg 1 / 3 Nb 2 / 3 )O 3 .

[0064] In step 2, the calcination temperature is 850° C., and the calcination time is 2 hours.

[0065] In step 3, the wet ball milling time is 12 hours.

[0066] In step 4, the sintering temperature is 1050° C., and the sintering time is 2 hours.

[0067] The dielectric temperature curve of the piezoelectric ceramic prepared in this embodiment is as follows figure 2 As shown, other physical properties of the sample were measured: the Curie temperature is 210° C., the dielectric constant is 870 (1 kHz), the piezoelectric constant is 490 pC / N, and the planar electromechanical coupling coefficient is 61%.

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Abstract

The invention discloses zinc-bismuth based perovskite-lead titanate-lead based relaxor ferroelectric ternary system piezoceramics and a preparation method thereof. The piezoceramics is shown by of general formula of (1-n)[(1-u-v)PbTiO3+uBi(ZnxDy)O3+vPb(EzFw)O3]+nM. The preparation method comprises the steps of mixed ball milling, presintering, blank material preparation, sintering, silver-layer coating and polarization. The piezoceramics composition has the morphotropic phase boundary of rhombic ferroelectric phases and square ferroelectric phases and has excellent piezoelectric performance and higher Curie temperature, the lead content is reduced, the lower sintering temperature is realized, the replacement of partial traditional lead-containing piezoceramics can be realized, the piezoceramics can be obtained through the traditional piezoceramics preparation technology and industrial raw materials, and the practicability is realized.

Description

1. Technical field [0001] The invention relates to a piezoelectric ceramic and a preparation method thereof, specifically a zinc-bismuth-based perovskite-lead titanate-lead-based relaxor ferroelectric ternary piezoelectric ceramic and a preparation method thereof, belonging to electronic components field of manufacturing technology. 2. Background technology [0002] Piezoelectric ceramics are an important class of functional ceramic materials. However, the commonly used piezoelectric ceramic materials are mainly based on lead zirconate (PbZrO 3 , referred to as PZ), lead titanate (PbTiO 3 , referred to as PT), and relaxor ferroelectric composition such as lead magnesium niobate (Pb(Mg 1 / 3 Nb 2 / 3 )O 3 , referred to as PMN), lead niobate zincate (Pb(Zn 1 / 3 Nb 2 / 3 )O 3 , referred to as PZN) and other binary or ternary systems. In particular, solid solution compositions composed of PT and lead-based relaxor ferroelectric ceramics have been successfully applied in single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/472C04B35/622C04B35/64
Inventor 左如忠刘义赵万里齐世顺左文武付健
Owner HEFEI UNIV OF TECH
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