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Deflection voltage electric material and preparation method thereof

A technology of flexoelectric and ferroelectric materials, applied in the field of piezoelectric materials, can solve the problems of increasing the structural complexity of flexoelectric materials, weight and volume, and no contribution to the apparent piezoelectric properties of piezoelectric materials, etc., to achieve The effect of simple structure, good temperature stability, and simple preparation method

Inactive Publication Date: 2015-07-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, only a few designs of flexoelectric materials have been proved to be feasible in experiments. One of them is a flexoelectric material with a pyramid-like structure. The force or voltage of the two surfaces creates a stress or electric field gradient in the material, and the material exhibits apparent piezoelectric properties; the other is a bending-type flexural piezoelectric composite design, such as figure 1 as shown, figure 1 Schematic diagram of the force of the flexural piezoelectric composite material provided for the prior art, from figure 1 It can be seen that the structure of the flexible piezoelectric composite material provided by the prior art is that several long ceramic bodies are separated by some tungsten wires, and the upper and lower sides of the composite material are hard metal plates. , the force applied on the metal plate is transmitted to the ceramic sheet through the tungsten wire, causing the ceramic sheet to bend, and the strain gradient is generated due to the bending deformation of the ceramic sheet, so that the material exhibits relatively strong apparent piezoelectric properties
[0005] The flexoelectric material in the prior art, in addition to the ferroelectric material used to generate the flexoelectric response, also has at least one inert material for applying force or transmitting force, such as flexovoltage Metal sheets and tungsten wires in electrical composites, these components do not contribute to the apparent piezoelectric properties of the piezoelectric material, but are essential but add to the complexity of the flexural piezoelectric material structure as well as its weight and volume

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  • Deflection voltage electric material and preparation method thereof
  • Deflection voltage electric material and preparation method thereof

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preparation example Construction

[0047] The invention provides a method for preparing a flexible piezoelectric material, comprising:

[0048] Preparation of oxide ferroelectric materials with arched structure;

[0049] Electrodes are respectively prepared on the upper and lower surfaces of the oxide ferroelectric material with an arched structure to obtain a flexural piezoelectric material.

[0050] The invention firstly prepares oxide ferroelectric material with arched structure. In the present invention, the type and source of the oxide ferroelectric material are consistent with the type and source of the oxide ferroelectric material described in the above technical solution, and will not be repeated here. In a preferred embodiment of the present invention, the oxide ferroelectric material can be a ceramic material; in other preferred embodiments, the oxide ferroelectric material can be a composition of 0.92Na 1 / 2 Bi 1 / 2 TiO 3 -0.08BaTiO 3 The ceramic material or composition is 0.94Na 1 / 2 Bi 1 / 2 TiO ...

Embodiment 1

[0071] Bi 2 o 3 、Na 2 CO 3 、BaCO 3 and TiO 2 According to 0.92Na 1 / 2 Bi 1 / 2 TiO 3 -0.08BaTiO 3 The stoichiometric ratio is batched, and the Bi after batching 2 o 3 、Na 2 CO 3 、BaCO 3 and TiO 2 Add alcohol and ball mill for 7 hours and then dry, and heat the dried powder at 850°C for 2 hours to obtain a mixed powder;

[0072] After mixing the mixed powder with a binder, press it to obtain a disc with a diameter of 25.4mm and a thickness of 0.5mm, and the amount of the binder is 4% of the mass of the mixed powder;

[0073] Putting the disc into an electric furnace for sintering at 1180°C for 1 hour, during the sintering process, the temperature difference between the upper and lower surfaces of the disc is within the range of 1°C to 3°C to obtain a ceramic green body;

[0074] Cool the ceramic body to room temperature to obtain an arched ceramic material with a diameter of 20 mm, an arch height of 0.1 mm, and a thickness of 0.5 mm;

[0075] Silver electrodes are ...

Embodiment 2

[0079] Prepare according to the method described in embodiment 1 and obtain composition and be 0.92Na 1 / 2 Bi 1 / 2 TiO 3 -0.08BaTiO 3 , a disc with a diameter of 20mm and a thickness of 0.325mm and a composition of 0.94Na 1 / 2 Bi 1 / 2 TiO 3 -0.06BaTiO 3 , a disc with a diameter of 20mm and a thickness of 0.325mm;

[0080] Set the composition to 0.92Na 1 / 2 Bi 1 / 2 TiO 3 -0.08BaTiO 3 The disc and composition are 0.94Na 1 / 2 Bi 1 / 2 TiO 3 -0.06BaTiO 3 The discs are ground and bonded together to form a composite disc;

[0081] keeping the composite disc in an electric furnace at 1100° C. for 10 hours, so that the two discs in the composite disc are bonded together at high temperature to obtain a bonded disc;

[0082] Cool the bonded disc to room temperature to obtain an arched ceramic material with a diameter of 20 mm, an arch height of 0.05 mm, and a thickness of 0.65 mm;

[0083] Silver electrodes are prepared on the upper and lower surfaces of the arched ceramic materi...

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Abstract

The invention provides a deflection voltage electric material which comprises an oxide ferro-electric material which is of an arched structure and electrodes arranged on the upper surface and the lower surface of the oxide ferro-electric material. The deflection voltage electric material is simple in structure, the ferro-electric material is only needed, and inert materials used for exerting force or transmitting the force are not needed. According to experimental results, the apparent piezoelectric property of the deflection voltage electric material ranges from 2 pC / N to 10 pC / N. In addition, the deflection voltage electric material has a better temperature stability. The invention provides a preparation method for the deflection voltage electric material. The method comprises the steps that the oxide ferro-electric material which is of the arched structure is prepared, the electrodes on the upper surface and the lower surface of the oxide ferro-electric material which is of the arched structure are prepared, and then the deflection voltage electric material is obtained. The preparation method for the deflection voltage electric material is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of piezoelectric materials, in particular to a flexible piezoelectric material and a preparation method thereof. Background technique [0002] In recent years, an electromechanical coupling effect—the flexoelectric effect and related applications has attracted more and more attention. The flexoelectric effect is defined as the polarization response of a material in the presence of a strain gradient (positive flexoelectric effect), or the stress response in the presence of an electric field gradient (reverse flexoelectric effect). [0003] Using the flexoelectric effect can design and prepare new piezoelectric materials, that is, flexoelectric materials. In the flexoelectric material, at least one component has a special shape or structure, which can convert the applied force or electrical signal into a corresponding gradient, so that the material produces a flexoelectric effect, and the material exhibits ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/80
Inventor 初宝进章小同周万丰
Owner UNIV OF SCI & TECH OF CHINA