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A kind of barium titanate lead-free piezoelectric ceramic with high temperature stability and preparation method thereof

A lead-free piezoelectric and barium titanate technology, which is applied in the field of piezoelectric ceramics, can solve problems such as large hysteresis, poor piezoelectric performance, and poor temperature stability, and achieve large electrical strain, excellent piezoelectric performance, and improved piezoelectric performance. performance effect

Active Publication Date: 2022-02-18
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of poor piezoelectric performance, large hysteresis and poor temperature stability in existing barium titanate-based lead-free piezoelectric ceramics, and provides a barium titanate-based lead-free piezoelectric ceramic with high temperature stability and its preparation method

Method used

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  • A kind of barium titanate lead-free piezoelectric ceramic with high temperature stability and preparation method thereof
  • A kind of barium titanate lead-free piezoelectric ceramic with high temperature stability and preparation method thereof

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specific Embodiment approach 1

[0023] Specific Embodiment 1: The general structural formula of the barium titanate lead-free piezoelectric ceramic with high temperature stability in this embodiment is as follows:

[0024] Ba 1-x (Li 0.5 ,B 0.5 ) x TiO 3 , where 0.001≤x≤0.1.

specific Embodiment approach 2

[0025] Specific embodiment two: the preparation method of barium titanate lead-free piezoelectric ceramics with high temperature stability in this embodiment includes the following steps:

[0026] 1. Weighing ingredients: mix barium carbonate, lithium carbonate, boron oxide and titanium oxide raw material powder according to the general formula Ba 1-x (Li 0.5 ,B 0.5 ) x TiO 3 The stoichiometric ratio is weighed, where 0.001≤x≤0.1;

[0027] Lithium ions and boron ions in the raw materials of this embodiment are easy to form defect complexes in the form of ion pairs in the ceramics due to their smaller ionic radii and greater electronegativity, and the ion pairs cause local lattice distortion in the structure. This kind of local lattice distortion makes it easier to flip the polarization direction, which is of great help to improve the piezoelectric performance of ceramics. At the same time, the self-built electric field generated by ion pairs inhibits the generation of rev...

specific Embodiment approach 3

[0035] Embodiment 3: This embodiment is different from Embodiment 2 in that: in step 2, the ball milling time is 10-14 hours, the drying temperature is 50-120° C., and the drying time is 10-14 hours. Others are the same as in the second embodiment.

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Abstract

A barium titanate-based lead-free piezoelectric ceramic with high temperature stability and a preparation method thereof relate to the field of piezoelectric ceramics, in particular to a barium titanate-based lead-free piezoelectric ceramic and a preparation method thereof. The purpose of the invention is to solve the problems of poor piezoelectric performance, large hysteresis and poor temperature stability existing in the existing barium titanate-based lead-free piezoelectric ceramics. The general structural formula of the barium titanate lead-free piezoelectric ceramic is Ba 1‑x (Li 0.5 ,B 0.5 ) x TiO 3 , where 0.001≤x≤0.1. Method: 1. Weigh the raw materials; 2. Ball mill and dry; 3. Heat the dried powder to the pre-firing temperature and then keep it warm and cool; 4. Ball-mill the pre-fired powder and dry; 5. Press the dried powder from the ball mill to form; 6. Heat the pressed and formed sample to the sintering temperature and then keep it warm and cool it; 7. Keep the sintered ceramic element with constant field strength for heat preservation, and then cool to room temperature with constant field strength. The invention is applied to the field of lead-free piezoelectric ceramics.

Description

technical field [0001] The invention relates to the field of piezoelectric ceramics, in particular to a barium titanate-based lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are functional ceramic materials that can exchange mechanical energy and electrical energy. They are mainly used in the manufacture of ultrasonic transducers, ceramic filters, piezoelectric generators and infrared detectors. In addition to being used in high-tech fields, in It is also widely used in daily life. [0003] At present, lead zirconate titanate-based materials are the most important application materials in the piezoelectric device market due to their excellent piezoelectric properties, but lead ions are harmful to the environment and human-machine, and the requirements for environmental protection make lead-free The inevitable development trend of piezoelectric ceramic materials. [0004] Most of the existing barium tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622C04B35/638C04B41/88H01L41/187
CPCC04B35/468C04B35/622C04B35/638C04B41/88C04B41/5116C04B2235/3203C04B2235/3409C04B2235/602C04B2235/6567H10N30/8536C04B41/4539C04B41/0072
Inventor 费维栋宋睿烜李伟力赵瑜
Owner HARBIN INST OF TECH
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