Optical dielectric ferroelectric ceramic material as well as preparation method and application thereof

A technology of ferroelectric ceramics and ceramic raw materials, applied in the field of ceramic materials, can solve the problems of low dielectric tunability and the like

Active Publication Date: 2021-07-16
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, ferroelectric materials such as potassium sodium niobate (KNN) and bismuth sodium titanate (BNT) ceramics with optical and dielectric properties have attracted extensive attention in terms of physical properties such as ferroelectricity, piezoelectricity, pyroelectricity, energy storage, and dielectric properties. However, the dielectric tunability of potassium sodium niobate (KNN) and bismuth sodium titanate (BNT) ceramics under light excitation is low

Method used

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  • Optical dielectric ferroelectric ceramic material as well as preparation method and application thereof
  • Optical dielectric ferroelectric ceramic material as well as preparation method and application thereof
  • Optical dielectric ferroelectric ceramic material as well as preparation method and application thereof

Examples

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preparation example Construction

[0084] The present invention also provides a preparation method for the optical dielectric ferroelectric ceramic material described in the above technical solution, comprising the following steps:

[0085] According to the stoichiometric ratio of the general chemical formula of the optical dielectric ferroelectric ceramic material, the K source, the Na source, the Nb source, the A source and the M source are mixed and ball milled to obtain a ceramic raw material mixed powder;

[0086] The ceramic raw material mixed powder is sequentially granulated, pressed and sintered to obtain the photoelectric ferroelectric ceramic material.

[0087] The invention mixes K source, Na source, Nb source, A source and M source according to the stoichiometric ratio of the general chemical formula of the optical dielectric ferroelectric ceramic material, and then performs ball milling to obtain ceramic raw material mixed powder.

[0088] In the present invention, the purity of the K source, Na s...

Embodiment 1

[0104] In this embodiment, the preparation raw materials are all commercially available, and the purity is more than or equal to 99%; the chemical general formula of the designed optical dielectric ferroelectric ceramic material is 0.97 (K 0.5 Na 0.5 )NbO 3 -0.03Ca(Ni 0.5 Nb 0.5 )O 3-δ ;

[0105] Preparation:

[0106] According to the stoichiometric ratio of elements in the general chemical formula of photoelectric ferroelectric ceramic materials, 2.5753g of Na 2 CO 3 , 0.3033g of CaCO 3 , 3.3683g of K 2 CO 3 , 0.1132g of NiO 2 and 13.1304g of Nb 2 o 5 Mix and place in a drum-type ball mill, use zirconium balls with a diameter of 3.8mm and 7.6mm as the grinding balls (the number ratio of zirconium balls with a diameter of 3.8mm and 7.6mm is 2:1), add 80mL of absolute ethanol as a liquid Medium, the first ball milling was carried out at 400rpm for 18h, the obtained ball milling colander was separated, dried in an oven at 70°C for 3h, passed through a 100-mesh sieve...

Embodiment 2

[0111] The general chemical formula of the optical dielectric ferroelectric ceramic material is designed to be 0.955 (K 0.5 Na 0.5 )NbO 3 -0.045Ca(Ni 0.5 Nb 0.5 )O 3-δ ;

[0112] According to the stoichiometric ratio of elements in the general chemical formula of photoelectric ferroelectric ceramic materials, Na 2 CO 3 , CaCO 3 、K 2 CO 3 , NiO 2 and Nb 2 o 5 In order to prepare the material, the rest of the technical means are the same as in Example 1 to obtain the optical dielectric ferroelectric ceramic material.

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Abstract

The invention belongs to the technical field of ceramic materials, and particularly relates to an optical dielectric ferroelectric ceramic material as well as a preparation method and application thereof. The invention provides an optical dielectric ferroelectric ceramic material, the chemical general formula of the optical dielectric ferroelectric ceramic material is (1-x)(K0.5Na0.5)NbO3-xA(MyNb1-y) O3-delta, wherein x is 0.005-0.10, and y is 0.01-0.5, A is one or more of AII group elements, and M is one or more of transition metal elements. By introducing the transition metal, the band gap of the (K0.5Na0.5)NbO3 material is reduced, and semiconduction is realized, so that the optical dielectric ferroelectric ceramic material has high optical dielectric tuning rate, the dielectric constant of the optical dielectric ferroelectric ceramic material is changed during optical excitation, and non-contact regulation and control of light on the dielectric property of the optical dielectric ferroelectric ceramic material are realized.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to an optical dielectric ferroelectric ceramic material and its preparation method and application. Background technique [0002] Dielectricity means that under the action of an external electric field, a non-conductive object, that is, a dielectric, will have excess charges of different signs at one end close to the charged body, and excess charges of the same sign at the other end. It shows the nature of the storage and loss of electrostatic energy, usually expressed by dielectric constant and dielectric loss. Light can cause changes in the dielectric properties of some dielectrics, such as sulfide, oxide semiconductor materials, and Mott insulator BaCoSiO with a filled tridymite structure. 4 The dielectric constant will change under light, and such materials are usually called photoelectric materials. [0003] In some dielectric crystals, the structure of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01G7/06
CPCC04B35/495C04B35/622H01G7/06C04B2235/3201C04B2235/3262C04B2235/3279C04B2235/3275C04B2235/3272C04B2235/3241C04B2235/3208C04B2235/3213C04B2235/3215
Inventor 许积文张杰饶光辉杨玲余文杰王华
Owner GUILIN UNIV OF ELECTRONIC TECH
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