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Leadless pyroelectric ceramic material and preparation method thereof

A technology of pyroelectric ceramics and ceramic blanks, applied in the field of strontium barium niobate-based lead-free pyroelectric ceramic materials and its preparation, lead-free pyroelectric ceramic materials and its preparation fields, can solve the problem of high material preparation cost, It is unfavorable for popularization and application, and achieves the effect of simple process, low cost and moderate dielectric constant

Inactive Publication Date: 2014-10-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been reported in the literature that the textured SBN53 / 47 ceramics prepared by hot pressing sintering have certain pyroelectric properties, but because hot pressing sintering requires high equipment, the cost of material preparation is high, which is not conducive to popularization and application

Method used

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  • Leadless pyroelectric ceramic material and preparation method thereof
  • Leadless pyroelectric ceramic material and preparation method thereof
  • Leadless pyroelectric ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] First, according to the general formula Sr 0.5 Ba 0.5 Nb 2 O 6 [x=0.00, abbreviated as CSBN(0.00)] Weigh the BaCO of the stoichiometric ratio 3 , SrCO 3 And Nb 2 O 5 For each powder, the wet ball milling process is used to make all the powders evenly mixed; the ball milling conditions are: ball milling material, agate balls and absolute ethanol are mixed in a mass ratio of 1:1.2:1.0, and ball milled for 24 hours.

[0031] After drying the obtained mixed powder and sieving through a 40-mesh sieve, it is compacted and synthesized in an atmospheric atmosphere. The synthesis temperature is 1200°C and the synthesis time is 3h. The obtained composition is Sr 0.5 Ba 0.5 Nb 2 O 6 The powder is crushed and passed through a 40-mesh sieve, and the powder is mixed uniformly by wet ball milling process again; the conditions of ball milling are: ball milling material, agate ball and absolute ethanol are mixed in a mass ratio of 1:1.8:0.7, and ball milled for 48h.

[0032] Dry the obtained C...

Embodiment 2

[0037] The difference between this embodiment and embodiment 1 is only: according to the general formula Ca 0.1 (Sr 0.5 Ba 0.5 ) 0.9 Nb 2 O 6 [x=0.10, abbreviated as CSBN(0.10)] Weigh the stoichiometric ratio of CaCO 3 , BaCO 3 , SrCO 3 And Nb 2 O 5 The powder.

[0038] The rest of the content of this embodiment is the same as that described in Embodiment 1.

Embodiment 3

[0040] The difference between this embodiment and embodiment 1 is only: according to the general formula Ca 0.15 (Sr 0.5 Ba 0.5 ) 0.85 Nb 2 O 6 [x=0.15, abbreviated as CSBN(0.15)] Weigh the stoichiometric ratio of CaCO 3 , BaCO 3 , SrCO 3 And Nb 2 O 5 The powder.

[0041] The rest of the content of this embodiment is the same as that described in Embodiment 1.

[0042] figure 1 This is a scanning electron micrograph of the strontium barium calcium niobate pyroelectric ceramic material prepared in this example after surface polishing and thermal etching. figure 1 It can be seen that most of the grain size of ceramics is small, between 1-3 μm.

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Abstract

The invention discloses a leadless pyroelectric ceramic material and a preparation method thereof. The leadless pyroelectric ceramic material has the following general formula: Cax(Sr0.5Ba0.5)1-xNb2O6, wherein x is equal to 0-0.20. The provided leadless pyroelectric ceramic material can be prepared by employing a conventional solid-phase powder preparation method and an air sintering technology. The prepared leadless pyroelectric ceramic material has the advantages of small crystal grain size, moderate dielectric constant and typical ferroelectric phase at room temperature, also has excellent intrinsic pyroelectric performance, and the pyroelectric coefficient of the leadless pyroelectric ceramic material at room temperature is capable of rivaling that of PZT serial lead-containing pyroelectric ceramic. Additionally, the preparation method has the advantages of simple technology, no special equipment, low cost and the like, is suitable for large-scale production and accords with industrialized production requirements.

Description

Technical field [0001] The invention relates to a lead-free pyroelectric ceramic material and a preparation method thereof, in particular to a strontium barium niobate-based lead-free pyroelectric ceramic material and a preparation method thereof, and belongs to the technical field of pyroelectric ceramic materials. Background technique [0002] Pyroelectric ceramics are one of the key sensitive materials of uncooled infrared detection technology. The ferroelectric ceramic materials that work as intrinsic pyroelectric mode are generally Pb-containing materials with perovskite structure. Barium strontium niobate based ferroelectric material with non-filled tetragonal tungsten bronze structure (Sr x Ba 1-x Nb 2 O 6 , Referred to as SBN) due to its lead-free, Pb-free volatilization, environmentally friendly, stable material performance, good mechanical strength, high detection merit, low thermal diffusivity, and electrical properties can be adjusted by changing the composition of the...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 王根水章晶董显林高峰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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