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A kind of optical dielectric ferroelectric ceramic material and its preparation method and application
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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: 2022-06-24
GUILIN UNIV OF ELECTRONIC TECH
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preparation example Construction
[0084] The present invention also provides a method for preparing the photodielectric ferroelectric ceramic material according to the above technical solution, comprising the following steps:
[0085] According to the stoichiometric ratio of the general chemical formula of the photodielectric ferroelectric ceramic material, the K source, the Na source, the Nb source, the A source and the M source are mixed and then ball-milled to obtain the ceramic raw material mixed powder;
[0086] The ceramic raw material mixed powder is sequentially granulated, pressed and sintered to obtain the photodielectric ferroelectric ceramic material.
[0087] According to the stoichiometric ratio of the general chemical formula of the photodielectric ferroelectric ceramic material, K source, Na source, Nb source, A source and M source are mixed and then ball-milled to obtain mixed powder of ceramic raw materials.
[0088] In the present invention, the purity of the K source, Na source, Nb source, ...
Embodiment 1
[0104] In this example, the preparation raw materials are all commercially available, and the purity is all ≥99%; the general chemical formula of the designed opto-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 the elements in the general chemical formula of the photodielectric ferroelectric ceramic material, 2.5753 g 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 Mixed and placed in a drum ball mill, using zirconium balls with diameters of 3.8mm and 7.6mm as grinding balls (the number ratio of zirconium balls with diameters of 3.8mm and 7.6mm is 2:1), and added 80mL of absolute ethanol as a liquid The medium was first ball milled at 400 rpm for 18 hours, and the obtained ball abrasive was separated with a colander, dried in an oven at 70 °C for 3 hours, passed through a 100-mesh sieve, p...
Embodiment 2
[0111] The general chemical formula for designing the photodielectric ferroelectric ceramic material is 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 the elements in the general chemical formula of the photodielectric ferroelectric ceramic material, Na 2 CO 3 , CaCO 3 , K 2 CO 3 , NiO 2 and Nb 2 O 5 For the preparation of the material, the remaining technical means are the same as those in Example 1, and the photodielectric ferroelectric ceramic material is obtained.
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Abstract
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. The invention provides a kind of optical dielectric ferroelectric ceramic material, the chemical general formula of described optical dielectric ferroelectric ceramic material is (1-x) (K 0.5 Na 0.5 )NbO 3 ‑xA(M y Nb 1‑y )O 3‑δ , x is 0.005-0.10, 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. The present invention reduces (K 0.5 Na 0.5 )NbO 3 The bandgap of the material realizes semiconduction, so that the photoelectric ferroelectric ceramic material has a high photoelectric tuning rate, and the dielectric constant of the photoelectric ferroelectric ceramic material changes when it is excited by light, realizing the light to the dielectric. Non-contact regulation of dielectric properties of photoelectric ferroelectric ceramic materials.
Description
technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a photodielectric ferroelectric ceramic material and a preparation method and application thereof. 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 exhibits the properties of storage and loss of electrostatic energy, usually expressed in terms of dielectric constant and dielectric loss. Light can cause changes in the dielectric properties of some dielectrics, such as sulfide, oxidesemiconductor materials, and filled tridymite-type Mott insulator BaCoSiO 4 The dielectric constant will change under light, and such materials are usually called photodielectric materials. [0003] In some dielectric crystals, the structure ...
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