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Lead magnesio-niobate-lead titanate binary system high-heat electricity-release ceramic material and preparation technique thereof

A pyroelectric ceramic and lead magnesium niobate technology, which is applied to the lead magnesium niobate-lead titanate binary system high pyroelectric ceramic material and its preparation, and the field of pyroelectric ceramic material and its preparation, which can solve the complex process , less source, high cost, to achieve the effect of simple preparation, convenient raw material processing and low cost

Inactive Publication Date: 2008-01-09
SHANGHAI NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The pyroelectric material currently used is a monolithic pyroelectric ceramic material, and the pyroelectric coefficient is about 4×10 -8 C / K·cm 2 Left and right, for example the Pb(Zr x , Ti 1-x )O 3 (referred to as PZT) one element system pyroelectric ceramic material, its pyroelectric coefficient is 4×10 -8 C / K·cm 2 Left and right; Although the Pb disclosed in Chinese patent CN1884194 (application date: 2006, 6, 23) 1-x-y La x Ca y Ti 1-x / 4 o 3 (abbreviated as PLCT) one-element pyroelectric ceramic material, its pyroelectric coefficient can be as high as 16×10 -8 C / K·cm 2 , but the material needs to be formed by gel injection molding, the process is more complicated, and the La used in the raw material 2 o 3 and CaCO 3 , are easy to absorb moisture, which is not conducive to storage and use, and the rare earth oxide La 2 o 3 There are also problems of few sources and high cost

Method used

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  • Lead magnesio-niobate-lead titanate binary system high-heat electricity-release ceramic material and preparation technique thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The composition formula of lead magnesium niobate (PMN)-lead titanate (PT) binary system is: xPb(Mg 1 / 3 Nb 2 / 3 )O 3 +(1-x)PbTiO 3 , x=0.28, the process of preparing a single-component linear pyroelectric ceramic material with the binary system element of the above-mentioned composition formula is as follows:

[0027] 1) Preparation of MgNb 2 o 6 , that is, in the basic form of MgCO 3 and Nb 2 o 5 reaction, where MgCO 3 and Nb 2 o 5 The feed ratio (molar ratio) is 1:1, the reaction temperature is 950~1020°C, and the reaction time is 2~6 hours;

[0028] 2) Prepare lead magnesium niobate-lead titanate single-component powder, that is, add PbO and TiO according to the chemical formula ratio 2 In the above MgNb 2 o 6 Medium reaction, the reaction conditions are: first react at 680-720°C for 1-3 hours, then react at 820-860°C for 1-3 hours;

[0029] 3) Carry out sintering according to the conventional ceramic material sintering process, the sintering temperature...

Embodiment 2

[0033] The composition formulas of lead magnesium niobate (PMN)-lead titanate (PT) binary system elements are: xPb(Mg 1 / 3 Nb 2 / 3 )O 3 +(1-x)PbTiO 3 , x=0.31(1#), 0.33(2#), 0.35(3#), the process of preparing multi-component nonlinear pyroelectric ceramic material with the above-mentioned binary system elements of each composition formula is as follows:

[0034] 1) Preparation of MgNb 2 o 6 , that is, in the basic form of MgCO 3 and Nb 2 o 5 reaction, where MgCO 3 and Nb 2 o 5 The feed ratio (molar ratio) is 1:1, the reaction temperature is 950~1020°C, and the reaction time is 2~6 hours;

[0035] 2) Preparation of lead magnesium niobate-lead titanate component powders, that is, adding PbO and TiO respectively according to the chemical formula ratio 2 In the above MgNb 2 o 6Medium reaction, the reaction conditions are: first react at 680-720°C for 1-3 hours, then react at 820-860°C for 1-3 hours;

[0036] 3) Place the spacer in the mold first, fill the above-mention...

Embodiment 3

[0041] The composition formula of lead magnesium niobate (PMN)-lead titanate (PT) binary system is: xPb(Mg 1 / 3 Nb 2 / 3 )O 3 +(1-x)PbTiO 3 , x=0.25, wherein the doping element is Mn (in the form of MnO), and the doping amount is 0.5wt% MnO, a process for preparing a single-component linear pyroelectric ceramic material with the doped binary system element of the above composition formula as follows:

[0042] 1) Preparation of MgNb 2 o 6 , that is, in the basic form of MgCO 3 and Nb 2 o 5 reaction, where MgCO 3 and Nb 2 o 5 The feed ratio (molar ratio) is 1:1, the reaction temperature is 950~1020°C, and the reaction time is 2~6 hours;

[0043] 2) Prepare lead magnesium niobate-lead titanate single-component powder, that is, add PbO and TiO according to the chemical formula ratio 2 and MnO 2 with the above MgNb 2 o 6 Medium reaction, the reaction conditions are: first react at 680-720°C for 1-3 hours, then react at 820-860°C for 1-3 hours;

[0044] 3) Carry out sin...

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Abstract

This invention discloses a binary system high pyroelectric ceramic materials of lead-niobate-magnesate and lead titanate. The basic components of this inventive single-component linear pyroelectric ceramic material and multicomponent nonlinear pyroelectric ceramic material are as below: xPb(Mg1 / 3Nb2 / 3)O3+(1-x)PbTiO3, i.e. xPMN+(1-x)PT, wherein x=0.2-0.48. The above-mentioned components involve doped elements. The pyroelectric coefficient of this inventive product is higher than that of prior art product. The dielectric coefficient of said product can be regulated between 1000-8000, the products can be matched with infrared focal plane devices. Compared with prior art gelatin moulding method, this inventive method has advantages of: simple operation, easy treatment of raw materials, low cost.

Description

technical field [0001] The present invention relates to a pyroelectric ceramic material and its preparation process, in particular to a lead magnesium niobate-lead titanate binary system high pyroelectric ceramic material and its preparation process, belonging to the technical field of pyroelectric ceramics . Background technique [0002] Pyroelectric ceramics are a kind of polycrystalline solid with non-zero macroscopic polarization intensity after artificial polarization treatment. Pyroelectric ceramic materials have the advantage of low cost, and have great application prospects in fire prevention, anti-theft, light switches, toys, etc. The pyroelectric effect can be directly used for infrared detection and thermal-electric energy conversion. The pyroelectric material currently used is a monolithic pyroelectric ceramic material, and the pyroelectric coefficient is about 4×10 -8 C / K·cm 2 Left and right, for example the Pb(Zr x , Ti 1-x )O 3 (referred to as PZT) one ...

Claims

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Application Information

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IPC IPC(8): C04B35/472
Inventor 孙大志朱杰朱玉丹张兰兰钱娟娟
Owner SHANGHAI NORMAL UNIVERSITY
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