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A lead-free piezoelectric ceramic material applied to energy harvesting devices and its preparation method

A lead-free piezoelectric, energy harvesting technology

Inactive Publication Date: 2017-12-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that although the material has a high mechanical quality factor Q m (803) and lower dielectric loss tanδ (0.009), but the conversion coefficient (d·g) is very low (4911×10 -15 m 2 / N), unable to meet the manufacturing needs of high-performance piezoelectric energy harvesters

Method used

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  • A lead-free piezoelectric ceramic material applied to energy harvesting devices and its preparation method
  • A lead-free piezoelectric ceramic material applied to energy harvesting devices and its preparation method
  • A lead-free piezoelectric ceramic material applied to energy harvesting devices and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Mix niobium pentoxide and potassium hydroxide at a molar ratio of 1:10 and grind them thoroughly, place them in a platinum crucible and calcinate at 360°C for 3 hours, and dissolve the product in deionized water; titrate with nitric acid to pH=2, A large amount of white precipitate was obtained. The white precipitate was collected by centrifugation and washed several times with deionized water, then dissolved in oxalic acid solution, heated and stirred until the precipitate was dissolved, and finally filtered to obtain a light yellow transparent soluble niobium solution. The solution was measured by ICP fluorescence spectroscopy. Medium Nb 5+ concentration;

[0028] (2) Measure the soluble niobium solution obtained in the quantitative step (1) with a measuring bucket, add ammonia water dropwise to pH=10~11, obtain a white precipitate through centrifugation and deionized water washing; dissolve the gained white precipitate in a concentration of 0.5~ 2mol / L citric ac...

Embodiment 2

[0031] In step (2), Mn(CH 3 COO) 2 Dissolved in solution B, the ceramic sintering temperature is 1000 ° C, and the rest are the same as in Example 1.

Embodiment 3

[0033] In step (2), Mn(CH 3 COO) 2 Dissolved in solution B, the ceramic sintering temperature is 980 ° C, and the rest are the same as in Example 1.

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Abstract

The invention relates to a leadless piezoelectric ceramic material applicable to an energy collecting device and a preparation method thereof, belonging to the field of piezoelectric ceramic materials. The preparation method comprises the following steps: mixing Nb2O5 and KOH, calcining, dissolving in deionized water, titrating with nitric acid to obtain a white precipitate, and dissolving in oxalic acid to obtain soluble niobium; titrating with ammonia water until the pH value is 10-11, thus obtaining a white precipitate; dissolving in citric acid to obtain a solution A; dissolving K2CO3, Na2CO3 and Li2CO3 in water to form a solution B, and dissolving Mn(CH3COO)2 in the solution B; mixing the solution A and the solution B, heating to obtain a sol, drying, and performing heat treatment to obtain powder; and granulating and molding the powder, and sintering at 950-1050 DEG C to obtain a ceramic body. According to the invention, the method is simple and low in energy consumption; and the prepared leadless piezoelectric ceramic material has a high electro-mechanical transformation coefficient and meets the requirements of an energy collecting device.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic material used in energy collection devices and a preparation method thereof, belonging to the field of piezoelectric ceramic materials. Background technique [0002] With the increasing development of wireless technology and MEMS technology, the disadvantages of the traditional energy supply method, which is mainly based on chemical batteries and needs to be replaced regularly, are increasingly revealed. Piezoelectric energy harvester is a new type of environmental energy harvesting technology. Based on the positive piezoelectric effect of piezoelectric materials, the device converts mechanical vibration energy that is almost ubiquitous in the environment into reusable electrical energy, thereby realizing microelectromechanical devices. Such as self-power supply of wireless sensor nodes, etc., so it has broad application prospects. The acquisition of piezoelectric materials with high energy de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G7/06C04B35/495C04B35/626C04B35/622
Inventor 侯育冬张立娜朱满康王超郑木鹏严辉
Owner BEIJING UNIV OF TECH