Ferroelectric-antiferroelectric (FE-AFE) phase change pyroelectric ceramic material, ceramic element thereof and preparation methods thereof

A technology of pyroelectric ceramics and ceramic materials, which is applied to ferroelectric-antiferroelectric phase change pyroelectric ceramic materials and ceramic components, and the field of phase change pyroelectric ceramics, which can solve the problems of limited practical application and large thermal hysteresis.

Active Publication Date: 2013-10-30
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

But since this phase transition is induced by an electric field, the electric field tends to stabilize the FE IN Phase, while the temperature tends to stabilize the AFE phase, the ceramic has a large thermal hysteresis (>30°C) when heating and cooling, which limits its practical application (Appl.Phys.Lett.94, 252902(2009).)

Method used

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  • Ferroelectric-antiferroelectric (FE-AFE) phase change pyroelectric ceramic material, ceramic element thereof and preparation methods thereof
  • Ferroelectric-antiferroelectric (FE-AFE) phase change pyroelectric ceramic material, ceramic element thereof and preparation methods thereof
  • Ferroelectric-antiferroelectric (FE-AFE) phase change pyroelectric ceramic material, ceramic element thereof and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The chemical formula of ferroelectric-antiferroelectric pyroelectric ceramic material is:

[0052] Pb 0.97 La 0.02 (Zr 0.42 Ti 0.18 sn 0.40 )O 3

[0053] (1) Calculate the composition Pb in the powder raw material according to the composition of the above chemical formula 3 o 4 , ZrO 2 、TiO 2 , SnO 2 and La 2 o 3 The mass and according to the composition ratio preparation, mixed by wet ball milling, according to the mass ratio of raw material: ball: water = 1: 1.6: 0.8 and mixed for 6 hours, so that each component was mixed evenly. After drying, add 10wt.% deionized water of the powder raw material, briquette in the air atmosphere, raise the temperature to 850°C at a rate of less than 2°C / min, and keep it warm for 2 hours to synthesize Pb 0.97 La 0.02 (Zr 0.42 Ti 0.18 sn 0.40 )O 3 of ceramic powder.

[0054] (2) smash the ceramic powder obtained in step (1), pass through a 30-mesh sieve, and finely grind for 24 hours by wet ball milling, dry the ceram...

Embodiment 2

[0066] The chemical formula of ferroelectric-antiferroelectric pyroelectric ceramic material is:

[0067] Pb 0.9625 La 0.025 (Zr 0.42 Ti 0.18 sn 0.40 )O 3

[0068] By repeating the preparation method of Example 1 according to the above chemical formula, a high pyroelectric response can be obtained at a lower temperature.

[0069] The pyroelectric performance after polarization treatment was tested for the ceramic element of this embodiment, and the test results are shown in Table 1.

[0070] The pyroelectric performance and thermal hysteresis of temperature rise and fall were tested for the ceramic element in this embodiment, and the test results are shown in Table 2.

[0071] It has been detected that the obtained ceramic element is in the FE phase at room temperature, and the phase transition of the ceramic element will only occur under temperature induction, and the phase transition that occurs is FE-AFE phase transition.

Embodiment 3

[0073] The chemical formula of ferroelectric-antiferroelectric pyroelectric ceramic material is:

[0074] Pb 0.9775 La 0.015 (Zr 0.42 Ti 0.18 sn 0.40 )O 3

[0075] The preparation method of Example 1 was repeated according to the above chemical formula, and the product was tested.

[0076] It has been detected that the obtained ceramic element is in the FE phase at room temperature, and the phase transition of the ceramic element will only occur under temperature induction, and the phase transition that occurs is FE-AFE phase transition.

[0077] The ceramic element of this embodiment was tested for the pyroelectric performance after the polarization treatment, and the test results are shown in Table 1, and the pyroelectric peak value p max More than 450×10 -8 C·cm -2 ·K -1 , for 458×10 -8 C·cm -2 ·K -1 .

[0078] The ceramic element of this embodiment has been tested on the pyroelectric performance and thermal hysteresis of temperature rise and fall under the ac...

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Abstract

The invention which relates to an FE-AFE phase change pyroelectric ceramic material belongs to the field of pyroelectric ceramic. The invention discloses the FE-AFE phase change pyroelectric ceramic material, a pyroelectric ceramic element and preparation methods of the material and the element. Chemical components of the ceramic material accord with a general chemical formula of (Pb1-3x / 2Lax)(ZryTizSn1-y-z)O3, wherein x is more than 0 and equal to or less than 0.025, y is from 0.38 to 0.46, and z is from 0.14 to 0.18; and the ceramic material is in a ferroelectric phase at room temperature and can generate an FE-AFE phase change with the temperature change with or without an extra electric field. The pyroelectric ceramic element has a large polarized change with the FE-AFE phase change after being polarized or under the effect of a direct current bias, so a large pyroelectric response is obtained, a pyroelectric coefficient is 2-4 times more than traditional pyroelectric coefficients, and heat stagnation substantially does not exist, so the pyroelectric ceramic element can be used in the uncooled infrared detection technology and the fields of heat-electrical energy transformation and the like.

Description

technical field [0001] The invention belongs to the field of pyroelectric ceramics, and relates to a phase-change pyroelectric ceramic, in particular to a ferroelectric-antiferroelectric (FE-AFE) phase-change pyroelectric ceramic material and a ceramic element. Background technique [0002] The pyroelectric effect can be directly used in infrared detection, thermal-electric energy conversion, thermal Joule applications, etc. Due to the advantages of convenient preparation, low cost, and stable performance, pyroelectric ceramic materials have been widely used in military and civilian fields. Pyroelectric ceramics that are currently used can be roughly divided into two categories: one is traditional pyroelectric ceramics, such as Pb(Zr x Ti 1-x )O 3 (PZT)-based ceramics, using the change of polarization with temperature when away from the phase transition point, work at the Curie temperature (T c ) below; another type is phase change pyroelectric material, such as (Ba x S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/493C04B35/457C04B35/622
Inventor 董显林张红玲陈学锋曹菲王根水
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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