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Lithium, cerium, tungsten (Li, Ce, W) co-doped bismuth calcium niobate (CBN)-based piezoelectric ceramic material and preparation method thereof

A bismuth-calcium niobate-based, bismuth-calcium niobate technology, applied in the field of materials science and engineering, to achieve the effects of improving piezoelectric performance, uniform crystal grains, and improving compactness

Inactive Publication Date: 2014-07-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no patent literature and non-patent literature reports on the co-doping of A and B sites of CBN-based ceramics

Method used

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  • Lithium, cerium, tungsten (Li, Ce, W) co-doped bismuth calcium niobate (CBN)-based piezoelectric ceramic material and preparation method thereof
  • Lithium, cerium, tungsten (Li, Ce, W) co-doped bismuth calcium niobate (CBN)-based piezoelectric ceramic material and preparation method thereof
  • Lithium, cerium, tungsten (Li, Ce, W) co-doped bismuth calcium niobate (CBN)-based piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of bismuth niobate calcium-based ceramic powder

[0037] According to the general formula Ca 0.92 (Li, Ce) 0.04 Bi 2 Nb 1.99 W 0.01 O 9 (X=0.08, Y=0.01) for weighing and batching, with absolute ethanol as the dispersion medium, the raw materials and absolute ethanol are mixed in a mass ratio of 1:1.5, placed in a polyurethane ball mill, and ball milled with a planetary ball mill for 12h , the rotating speed is 400rpm, bake under the baking lamp for 2h, and then continuously heat up to 850℃ in the programmed temperature box furnace, and keep the temperature for 2h to obtain the calcium bismuth niobate-based ceramic powder;

[0038] (2) Secondary ball milling

[0039] The above-mentioned calcium bismuth niobate-based ceramic powder and dispersion medium absolute ethanol were mixed at a mass ratio of 1:1.5, placed in a polyurethane ball mill, and milled with a planetary ball mill for 12 hours at a rotational speed of 400 rpm, and baked under a drying la...

Embodiment 2

[0047] According to the general formula Ca 0.92 (Li, Ce) 0.04 Bi 2 Nb 1.96 W 0.04 O 9 (X=0.08, Y=0.04) for weighing and batching, with absolute ethanol as the dispersion medium, the raw materials and absolute ethanol are mixed at a ratio of 1:1.5, placed in a polyurethane ball mill, and ball milled with a planetary ball mill for 12h, The rotating speed is 400 rpm, and it is baked under a baking lamp for 2 hours, and then continuously heated to 850° C. in a programmed temperature-controlled box furnace, and kept for 2 hours to obtain a calcium bismuth niobate-based ceramic powder;

[0048] (2) Secondary ball milling

[0049] The above-mentioned calcium bismuth niobate-based ceramic powder and dispersion medium absolute ethanol were mixed at a mass ratio of 1:1.5, placed in a polyurethane ball mill, and milled with a planetary ball mill for 12 hours at a rotational speed of 400 rpm, and baked under a drying lamp for 2 hours. to dry;

[0050] (3) Granulation and tableting ...

Embodiment 3

[0057] (1) Preparation of bismuth niobate calcium-based ceramic powder

[0058] According to the general formula Ca 0.92 (Li, Ce) 0.04 Bi 2 Nb 1.97 W 0.03 O 9 (X=0.08, Y=0.03) for weighing and batching, with absolute ethanol as the dispersion medium, the raw materials and absolute ethanol are mixed at a mass ratio of 1:1.5, placed in a polyurethane ball mill, and ball milled with a planetary ball mill for 12h , the rotating speed is 400rpm, bake under the baking lamp for 2h, and then continuously heat up to 850°C in a programmed temperature-controlled box furnace, and keep the temperature for 2h to obtain the calcium bismuth niobate-based ceramic powder;

[0059] (2) Secondary ball milling

[0060] The above-mentioned calcium bismuth niobate-based ceramic powder and dispersion medium absolute ethanol were mixed at a mass ratio of 1:1.5, placed in a polyurethane ball mill, and milled with a planetary ball mill for 12 hours at a rotational speed of 400 rpm, and baked under...

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Abstract

The invention discloses a lithium, cerium, tungsten (Li, Ce, W) co-doped bismuth calcium niobate (CBN)-based piezoelectric ceramic material and a preparation method thereof. The piezoelectric ceramic material is characterized by being represented by the following general formula: Ca1-x(Li, Ce)x / 2Bi2Nb2-yWyO9, wherein the x is greater than or equal to 0.02 and less than or equal to 0.15; the y is greater than or equal to 0.01 and less than or equal to 0.1; the X represents the mole fraction of an A-bit Li element and an A-bit Ce element; the Y represents the mole fraction of a B-bit W element. The preparation method comprises the following steps: preparing a CBN ceramic powder material with different doping quantities of the A-bit Li, the A-bit Ce and the B-bit W via a solid phase method; and carrying out the processes of granulation, tabletting, glue removing, sintering, silver coating and polarization so as to prepare the Li, Ce, W co-doped CBN-based piezoelectric ceramic material. The result shows that the Li, Ce, W co-doped CBN-based piezoelectric ceramic material prepared at a relatively low sintering temperature (about 1100 DEG C) has relatively compact and uniform crystalline grains, i.e., the sintering activity and the ceramic compactness are improved, so that a good sintering effect is obtained. Thus, the piezoelectric property of the piezoelectric ceramic material is greatly improved; the dielectric loss of the piezoelectric ceramic material is decreased.

Description

technical field [0001] The invention relates to a lithium, cerium, tungsten (Li, Ce, W) co-doped calcium bismuth niobate (CBN)-based piezoelectric ceramic material and a preparation method thereof, that is, lithium is simultaneously doped in the preparation process of the CBN-based ceramic material , Cerium, Tungsten (Li, Ce, W) elements. It belongs to the field of materials science and engineering. Background technique [0002] With the rapid development of modern science and technology, many industrial sectors and scientific research institutions in energy, automobile, aerospace, petrochemical, geological exploration, and atomic energy urgently need electronic equipment that can work at higher temperatures. Bismuth-containing layered piezoelectric ceramics have high T c , Low dielectric constant, obvious anisotropy of electromechanical coupling coefficient, low aging rate, high resistivity, low production cost and easy modification, it has broad application prospects in ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B41/88
Inventor 朱建国王亚丹陈强彭志航肖定全
Owner SICHUAN UNIV
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