Composite pyroelectric ceramic material and preparation method thereof

A technology of pyroelectric ceramics and systems, applied in the field of materials, can solve problems such as limited

Inactive Publication Date: 2015-04-29
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the new quaternary composite structure pyroelectric ceramic system with high pyroelectric coefficient and adjustable electrical properties is very limited.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1 of the present invention provides a novel quaternary composite system pyroelectric ceramic material, whose general chemical formula is: Pb{[(Me 1 / 3 Nb2 / 3 ) x (W 1 / 3 Fe 2 / 3 ) 1-x ] y (Zr 0.9 Ti 0.1 ) 1-y}O 3 -nMe';

[0032] Among them, Me is one of Mg or Zn; x and y represent the mole fraction respectively, 0.125≤x≤0.875, 0.08≤y≤0.11; Me' is a commonly used modifying element, which can be Li, La or Sb One or more of them, the molar ratio range is 0mol%≤n≤5mol%.

[0033] The novel quaternary composite system pyroelectric ceramic material Pb{[(Me 1 / 3 Nb 2 / 3 ) x (W 1 / 3 Fe 2 / 3 ) 1-x ] y (Zr 0.9 Ti 0.1 ) 1-y}O 3 -nMe' has a higher pyroelectric coefficient (λ=5×10 -8 C·cm -2 ·K -1 ~20×10 -8 C·cm -2 ·K -1 ), suitable dielectric constant (100-800) and low dielectric loss (0.008-0.030), and these properties are adjustable in a wide range, and dense and uniform ceramics can be obtained at a lower sintering temperature Body, so the material...

Embodiment 2

[0035] This embodiment provides the preparation method of the pyroelectric ceramic material in the above-mentioned embodiment 1, such as figure 1 shown, including:

[0036] Step 201, the Fe 2 o 3 and WO 3 According to the molar ratio of 1:1, mix and ball mill, dry and then calcinate and grind to make FeWO 4 Precursor powder, and MgO and Nb 2 o 5 or ZnO and Nb 2 o 5 One group of them was ball-milled at a molar ratio of 1:1, dried and then calcined and ground to make MgNb 2 o 6 or ZnNb 2 o 6 Precursor powder;

[0037] Step 202, Pb 3 o 4 , ZrO 2 、TiO 2 、FeWO 4 Precursor powder, MnNb 2 o 6 or ZnNb 2 o 6 Precursor powder, oxide or salt of modifying element Me' according to the general chemical formula Pb{[(Me 1 / 3 Nb 2 / 3 ) x (W 1 / 3 Fe 2 / 3 ) 1-x ] y (Zr 0.9 Ti 0.1 ) 1-y}O 3 The mol ratio of -nMe' is weighed, then mixed and ball milled to obtain the slurry;

[0038] Among them, Me is one of Mg or Zn; x and y represent the mole fraction respectively, 0.1...

Embodiment 3

[0052] MgO and Nb 2 o 5 Mix and ball mill at a molar ratio of 1:1, dry and then calcinate and grind to make MgNb 2 o 6 Precursor powder; the Fe 2 o 3 and WO 3 According to the molar ratio of 1:1, mix and ball mill, dry and then calcinate and grind to make FeWO 4 Precursor powder. will Pb 3 o 4 , ZrO 2 、TiO 2 , MgNb 2 o 6 Precursor powder and FeWO 4 Precursor powder according to Pb{[(Mg 1 / 3 Nb 2 / 3 ) 0.25 (W 1 / 3 Fe 2 / 3 ) 0.75 ] 0.08 (Zr 0.9 Ti 0.1 ) 0.92}O 3 Weigh the molar ratio, add anhydrous ethanol medium to mix and ball mill, dry and sieve, and pre-calcine at 750°C for 2 hours. Ball mill and dry the block obtained after pre-calcination, add 5% PVA to granulate, age for 6 hours, and press it into a green body with a diameter of 15mm and a thickness of about 1.5mm after sieving. Sintering at 1100° C. for 2.5 hours to obtain a ceramic body. After grinding, polishing, and silvering the obtained ceramic body, it was polarized in 120°C silicone oil with ...

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Abstract

The invention discloses a composite pyroelectric ceramic material and a preparation method thereof. The chemical general formula of the material is Pb {[(Me1 / 3Nb2 / 3)x(W1 / 3Fe2 / 3)1-x]y(Zr0.9Ti0.1) (1-y) }O3-nMe', wherein Me is Mg or Zn; x and y represent a mole fraction respectively, x is larger than or equal to 0.125 and smaller than or equal to 0.875, and y is larger than or equal to 0.08 and smaller than or equal to 0.11; Me' is a modified element and is one or more of Li, La and Sb, and the molar ratio range n is larger than or equal to 0 mol% and smaller than or equal to 5 mol%. The composite pyroelectric ceramic material has a higher pyroelectric coefficient and adjustable dielectric property, thereby having a better application prospect in various pyroelectric detectors.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a novel quaternary composite system pyroelectric ceramic material and a preparation method thereof. Background technique [0002] Pyroelectric materials can be used in infrared detectors, infrared thermometers and cameras, etc. These devices have been widely used in the fields of flame detection, environmental pollution monitoring, non-contact temperature measurement, medical diagnosis, industrial process automatic monitoring, security warning, etc. Applications. [0003] At present, the widely used pyroelectric ceramic is zirconium-rich lead zirconate titanate (PZT). However, the low-temperature ferroelectric rhombohedral phase (F RL ) to high temperature ferroelectric rhombohedral phase (F RH ) has a narrow first-order phase transition temperature range (2–3°C), which is not conducive to its application in infrared detection. This F RL -F RH The phase change temperature...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/26C04B35/622
Inventor 郭栋王云丽蔡锴史丹丹
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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