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A kind of natural polar ceramic material with high voltage constant and low pyroelectric coefficient and its preparation method

A technology of voltage constant and ceramic materials, applied in the field of natural polar ceramic materials, can solve the problems of small value of piezoelectric constant, non-uniformity, restriction of wide application, etc., to improve piezoelectric voltage constant, improve piezoelectric performance, small dielectric The effect of electric constant

Inactive Publication Date: 2017-05-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the piezoelectric constants of this type of naturally polar ceramics are still small and non-uniform, which greatly restricts their wide application.

Method used

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  • A kind of natural polar ceramic material with high voltage constant and low pyroelectric coefficient and its preparation method
  • A kind of natural polar ceramic material with high voltage constant and low pyroelectric coefficient and its preparation method
  • A kind of natural polar ceramic material with high voltage constant and low pyroelectric coefficient and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A natural polar ceramic material with high voltage constant and low pyroelectric coefficient, the composition formula is 0.5MgTiO 3 -Bi 12 TiO 20 ,

[0045] Preparation method, the steps are as follows:

[0046] (1) MgO, TiO 2 Mix according to the molar ratio of 1:1, ball mill with absolute ethanol as the medium for 12h, the amount of absolute ethanol is MgO, TiO 2 70% of the total weight, then baked at 105°C for 3h, ground, put the ground powder in an alumina crucible and pre-fired at 1100°C for 2h to obtain MgTiO 3 . Prepared MgTiO 3 Measure X-rays such as image 3 shown.

[0047] (2) will Bi 2 o 3 、TiO 2 Mix according to the molar ratio of 6:1, take dehydrated alcohol as medium ball mill 12h, the consumption of dehydrated alcohol is Bi 2 o 3 、TiO 2 70% of the total weight, then baked at 105°C for 3h, ground, pressed into a round green body with a diameter of 30mm and a thickness of 2mm, and placed the green body in an alumina crucible and sintered at 75...

Embodiment 2

[0062] A natural polar ceramic material with high voltage constant and low pyroelectric coefficient, the composition formula is 0.1MgTiO 3 -Bi 12 TiO 20 ,

[0063] Preparation method is with embodiment 1, and difference is: step (3) MgTiO 3 : Bi 12 TiO 20 The molar ratio is 0.1:1.

[0064] The performance results of the natural polar ceramics prepared in Example 2 are shown in Table 2 below, and the detection method is the same as in Example 1.

[0065] Table 2

[0066] d 33 (pC / N)

Embodiment 3

[0068] A natural polar ceramic material with high voltage constant and low pyroelectric coefficient, the general formula is MgTiO 3 -Bi 12 TiO 20 ,

[0069] Preparation method is with embodiment 1, and difference is: step (3) MgTiO 3 : Bi 12 TiO 20 The molar ratio is 1:1.

[0070] The performance results of the natural polar ceramics prepared in Example 3 are shown in Table 3 below, and the detection method is the same as in Example 1.

[0071] table 3

[0072] d 33 (pC / N)

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Abstract

The invention relates to a natural polar ceramic material with high a piezoelectric voltage coefficient and a low pyroelectric coefficient. The method comprises mixing MgTiO3 and Bi12TiO20 with bonding agent for temperature-different sintering at 820-920 DEG C for 10 min-3 h, wherein the composition formula is xMgTiO3-Bi12TiO20 and x is 0.1-4. The natural polar ceramic material sintered from MgTiO3 and Bi12TiO20 obtains a relatively high piezoelectric strain constant of 12-18 pC / N, a relatively high electromechanical coupling coefficient of 8-10%, a relatively low dielectric constant of 48-58 , a relatively large piezoelectric voltage constant of g33(23-41*10-3Vm / N, a relatively low dielectric loss of 0.5-1% and a relatively small pyroelectric coefficient of 2.3-3.7*10-11 C*cm-2*k-1.

Description

technical field [0001] The invention relates to a high-voltage electric voltage constant and low pyroelectric coefficient natural polar ceramic material, belonging to the technical field of functional ceramic applications. Background technique [0002] Traditional piezoelectric ceramics are ferroelectric ceramics with piezoelectric properties after DC high-voltage polarization treatment, and are functional ceramic materials that can realize mutual conversion of mechanical energy and electrical energy. Because of its unique performance, piezoelectric ceramics are widely used in high-tech fields such as information, laser, navigation, electronic technology, communication, metrology and detection, precision machining and sensing technology. In piezoelectric igniters, hydrophones, piezoelectric accelerometers and other devices, piezoelectric ceramics are required to have a high piezoelectric voltage constant g 33 . With the rapid development of science and technology, these fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 赵明磊于丹王春雷
Owner SHANDONG UNIV