Graded-distribution ferroelectric phase change type lead magnesio-niobate-lead titanate ceramic material

A lead magnesium niobate, gradient distribution technology, applied in the field of ferroelectric materials, can solve the problems of high cost of rare earth raw materials, complex preparation process, easy moisture absorption, etc., and achieve easy storage and use, simple preparation process, and convenient raw material processing Effect

Inactive Publication Date: 2011-01-19
SHANGHAI NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. The pyroelectric effect is linear, and the pyroelectric coefficient is low, generally at 4×10 -8 C / K·cm 2 about
[0005] 2. Some ferroelectric materials are formed by gel injection molding. Although the pyroelectric coefficient is high, the process is complicated; La in the raw material 2 o 3 and CaCO 3 , easy to absorb moisture, not conducive to storage and use
[0006] 3. La 2 o 3 The raw material cost of rare earth oxide is high
[0009] Chinese patent application number 200610019451.5 discloses Pb 1-x-y La x Ca y Ti 1-x / 4 O ferroelectric material, pyroelectric coefficient 8.0, but its preparation process is complicated; La 2 o 3 The cost of rare earth raw materials is high

Method used

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  • Graded-distribution ferroelectric phase change type lead magnesio-niobate-lead titanate ceramic material
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  • Graded-distribution ferroelectric phase change type lead magnesio-niobate-lead titanate ceramic material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Parallel gradient lead magnesium niobate-lead titanate ferroelectric phase change ceramic material.

[0040] The formulations of the components of the lead magnesium niobate-lead titanate binary system high pyroelectric ceramic material are: (1-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +x PbTiO 3 ; x=0.32(1#), 0.33(2#), 0.34(3#), the process for preparing this multi-component nonlinear pyroelectric ceramic material is:

[0041] (1) Preparation of MgNb 2 o 6 , with basic 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.

[0042] (2) Preparation of lead magnesium niobate-lead titanate powder, that is, adding PbO and TiO in proportion to the chemical formula 2 and other raw materials with the above MgNb 2o 6 Medium reaction, the reaction conditions are: first react at 680-720°C for 1-3 hours, and then react at 820-860°C for 1-3 hours.

[0043] (3) First ins...

Embodiment 2

[0048] Laminated gradient lead magnesium niobate-lead titanate ferroelectric phase change ceramic material.

[0049] The composition formula of lead magnesium niobate-lead titanate binary system high pyroelectric ceramic material is:

[0050] (1-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +x PbTiO 3 ; x=0.31(1#), 0.33(2#), 0.35(3#), the process for preparing this type of gradient ceramic material is:

[0051] (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.

[0052] (2) Preparation of lead magnesium niobate-lead titanate powder, that is, adding PbO and TiO in proportion to the chemical formula 2 , MnO 2 and other raw materials with the above MgNb 2 o 6 Medium reaction, the reaction conditions are: first react at 680-720°C for 1-3 hours, and then react at 820-860°C for 1-3 hours.

[0053] (3) Fill th...

Embodiment 3

[0058] The composition formula of the doped lead magnesium niobate-lead titanate binary system ceramic material is: (1-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 +x PbTiO 3 , x=0.33, wherein the doping element is Al (in Al 2 o 3 Form), the doping amount is 0.5wt%Al respectively 2 o 3 (1#), 0.8wt% Al 2 o 3 (2#), 1.0wt% Al 2 o 3 (3#), the process for preparing this gradient ferroelectric phase change ceramic material is:

[0059] (1) According to the preparation process of lead magnesium niobate-lead titanate powder described in Example 1, each component powder was prepared.

[0060] (2) Place the spacer in the mold first, fill the above-mentioned lead magnesium niobate-lead titanate component powder into the corresponding area, then remove the spacer, and press molding (see figure 1 shown).

[0061] (3) Sintering is carried out according to the conventional ceramic material sintering process, the sintering temperature is 1270-1300° C., and the sintering time is 1-3 hours.

[0062] (4...

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Abstract

The invention belongs to a ferroelectric material, in particular to a graded-distribution ferroelectric phase change type lead magnesio-niobate-lead titanate ceramic material. The existing ferroelectric material has the defects of low pyroelectric coefficient, complex process of a gel casting mold method and high raw material cost of La2O3 rare earth. The composition of the ceramic material in the invention is as follows: (1-x)Pb(Mg1 / 3Nb2 / 3)O3+xPbTiO3, wherein x=0.2-0.48, and the doping amount of MnCO3, Al2O3 and CeO2 is 0.2-1.5wt%. The material is prepared by the steps of preparing lead magnesio-niobate-lead titanate powder, filling the powder in a die, pressing and molding, sintering and performing after-polarization by silver. The material has the advantages that the pyroelectric coefficient thereof is improved by over 100% compared with the existing pyroelectric material, the dielectric coefficient is between 1000 and 4000 and is adjustable, the preparation is simple and the cost is low.

Description

technical field [0001] The invention belongs to a ferroelectric material, in particular to a gradient distribution ferroelectric phase transition type lead magnesium niobate-lead titanate ceramic material. Background technique [0002] Ferroelectric materials refer to a class of materials with ferroelectric effect, which is a branch of pyroelectric materials. Ferroelectric materials have excellent properties and are functional materials with broad application prospects. Ferroelectric materials can be directly used for thermoelectric energy conversion and infrared detection. Ferroelectric ceramic materials have the advantage of low cost, and have a wide range of application values ​​in fire prevention, anti-theft, power switches, teaching utensils, etc. The structure and application of ferroelectric materials have become one of the most important research topics in the fields of condensed matter physics and solid-state electronics. [0003] The disadvantages of prior art fe...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 孙大志唐艳学马丽宫兆泉金国玺刘永勤陈岭娣吴晓波
Owner SHANGHAI NORMAL UNIVERSITY
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