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BNT-based lead-free pyroelectric ceramic material with low dielectric loss and preparation method thereof

A technology of pyroelectric ceramics and dielectric loss, applied in the field of TiO3-based lead-free pyroelectric ceramic materials and its preparation, can solve the problems that the performance cannot be compared with PZT, affect the sensitivity of infrared detectors, restrict development and application, etc. Achieve the effects of large pyroelectric figure of merit, low dielectric loss, and small dielectric constant

Inactive Publication Date: 2019-03-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, the high dielectric loss will cause a lot of noise in the actual application process of the material, which will affect the sensitivity of the infrared detector, thus restricting its further development and application in the field of infrared imaging.
For practical application, the material needs to have high depolarization temperature, low dielectric loss and high pyroelectric performance at the same time. Although lead-free materials have made great progress in pyroelectricity, the performance is still not comparable to that of PZT. Therefore, it is necessary to further optimize the performance to obtain materials with excellent pyroelectric performance, high depolarization temperature and low dielectric loss

Method used

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  • BNT-based lead-free pyroelectric ceramic material with low dielectric loss and preparation method thereof
  • BNT-based lead-free pyroelectric ceramic material with low dielectric loss and preparation method thereof
  • BNT-based lead-free pyroelectric ceramic material with low dielectric loss and preparation method thereof

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preparation example Construction

[0026] The invention relates to a bismuth sodium titanate (BNT)-based lead-free pyroelectric ceramic material with excellent pyroelectric performance, low dielectric loss and high depolarization temperature and a preparation method thereof. The bismuth sodium titanate The chemical composition general formula of lead-free pyroelectric ceramic material is (1-x)(Bi 0.5 Na 0.5 )TiO 3 -xBa(Ni0.5 Nb 0.5 )O 3 (It may be referred to as "(1-x)BNT-xBNN"), wherein 03+ and Nb 5+ The valence state of the ions is lower than that of BNT-based Ti 4+ The valence states are relatively low and relatively high respectively. By adjusting the content of BNN, it is expected that the BNT-BNN solid solution will show the advantages of acceptor doping (Ni) and donor doping at the same time (acceptor doping: reduce dielectric Constant and dielectric loss (ε, tanδ), donor doping: increase polarization (P r , P s ), reducing the coercive field is conducive to complete polarization of the material a...

Embodiment 1

[0038] The composition of the material is 0.98(Bi 0.5 Na 0.5 )TiO 3 -0.02Ba(Ni 0.5 Nb 0.5 )O 3 , weigh the raw material Bi according to the formula 2 o 3 Powder (analytical pure), NaHCO 3 Powder (analytical pure), TiO 2 Powder (analytical pure), BaCO 3 Powder (analytical pure), NiO powder (analytical pure), Nb 2 o 5The powder (analytically pure) is mixed by wet ball milling for 24 hours to make the components evenly mixed, the medium of the ball ink is zirconium balls, and the solvent is absolute ethanol. Zirconium balls are preferred, and the raw materials used: alcohol: zirconium balls are 1:1:5. Drying, compression molding, heat preservation synthesis to obtain BNT-BNN solid solution powder. During the synthesis process, the synthesis temperature was 850° C., and the holding time was 2 hours. After synthesis, crush the block, pass through a 40-mesh sieve, perform the second wet ball mill, dry the powder, add binder, granulate, briquetting, aging, sieving, cold ...

Embodiment 2

[0041] The composition of the material is 0.97(Bi 0.5 Na 0.5 )TiO 3 -0.03Ba(Ni 0.5 Nb 0.5 )O 3 According to the formula, the same preparation method as in Example 1 is used to obtain BNT-BNN based pyroelectric ceramics and polarized pyroelectric ceramic components, and the dielectric temperature of the polarized sample is measured without an external electric field. and pyroelectric performance. The measurement results are shown in Table 1.

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Abstract

The invention relates to a BNT-based lead-free pyroelectric ceramic material with low dielectric loss and a preparation method thereof. The BNT-based lead-free pyroelectric ceramic material adopts a chemical composition of (1-x)(Bi0.5Na0.5)TiO3-xBa(Ni0.5Nb0.5)O3, and x is greater than 0 and is smaller than or equal to 0.04.

Description

technical field [0001] The present invention relates to a kind of low dielectric loss (Bi 0.5 Na 0.5 )TiO 3 The invention discloses a lead-free pyroelectric ceramic material and a preparation method thereof, belonging to the field of infrared detection materials. Background technique [0002] The pyroelectric effect is the electrical effect of pyroelectric materials on temperature changes. It has been studied for a long time. Due to this characteristic, pyroelectric materials are used in thermal imaging, laser detection, radiometers, infrared detectors, fire alarms, etc. It has a wide range of applications, and its application in energy harvesting has also attracted widespread attention in recent years. Among them, the pyroelectric material is the core component of the infrared detector, and its working modes include intrinsic pyroelectric mode and dielectric-pyroelectric mode. Intrinsic pyroelectric mode mainly utilizes the charge generated by the change of spontaneous ...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622C04B41/88
CPCC04B35/475C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3201C04B2235/3215C04B2235/3232C04B2235/3251C04B2235/3279C04B2235/602C04B2235/656C04B2235/6567C04B41/4535C04B41/0072
Inventor 王根水贾佳慧郭少波姚春华曹菲董显林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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