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A kind of ultra-low loss magnesium lithium niobate system microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and magnesium niobate, which is applied in the field of ultra-low loss magnesium lithium niobate system microwave dielectric ceramic materials and its preparation, can solve the problems of high quality factor of ceramic materials and the influence of ceramic quality factor, and achieve excellent dielectric properties performance, reduce production cost, and improve the effect of quality factor

Active Publication Date: 2020-11-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although doping is the most commonly used method to improve the dielectric properties of microwave dielectric ceramics, the introduced impurities usually appear as impurity phases entering the interior of the crystal lattice or second phases precipitated at the grain boundaries, which have a greater impact on the quality factor of ceramics. influences
In combination with the above, it can be seen that although the use of sintering aids can reduce the sintering temperature to suppress the volatilization of Li, the impurities introduced in the sintering aids will limit the improvement of the quality factor of ceramic materials, and it is also impossible to exert Li. 3 Mg 2 NbO 6 The advantages of high quality factor of ceramic materials

Method used

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  • A kind of ultra-low loss magnesium lithium niobate system microwave dielectric ceramic material and preparation method thereof
  • A kind of ultra-low loss magnesium lithium niobate system microwave dielectric ceramic material and preparation method thereof
  • A kind of ultra-low loss magnesium lithium niobate system microwave dielectric ceramic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing an ultra-low loss magnesium-lithium niobate system microwave dielectric ceramic material, characterized in that it comprises the following steps:

[0036] Step 1: batching; raw material MgO, Li 2 CO 3 and Nb 2 o 5 According to the general chemical formula Li 3+x Mg 2 NbO 6 , wherein the stoichiometric ratio of x=0.2, x=0.4, x=0.6, x=0.8 is compounded, and the purity of the raw materials is greater than 99%;

[0037] Step 2: mixing materials; the raw materials obtained in step 1 are ball milled, and the specific ball milling process is: using zirconia balls as the ball milling medium, and deionized water as the solvent, the raw materials, zirconia balls, and deionized water are mixed according to the mass ratio of 1: 5: 1.5 was placed in a planetary ball mill for wet ball milling, the ball milling time was 4 hours, and the rotation speed was 250rad / s to obtain the first slurry;

[0038] Step 3: drying the slurry; pour out the first slurry ob...

Embodiment 2

[0058] A method for preparing an ultra-low loss magnesium-lithium niobate system microwave dielectric ceramic material, characterized in that it comprises the following steps:

[0059] Step 1: batching; raw material MgO, Li 2 CO 3 and Nb 2 o 5 According to the general chemical formula Li 3+0.4 Mg 2 NbO 6 The stoichiometric ratio is compounded, and the purity of the raw materials is greater than 99%;

[0060] Step 2: mixing materials; the raw materials obtained in step 1 are ball milled, and the specific ball milling process is: using zirconia balls as the ball milling medium, and deionized water as the solvent, the raw materials, zirconia balls, and deionized water are mixed according to the mass ratio of 1: 4:2 is placed in a planetary ball mill for wet ball milling, the ball milling time is 3 hours, and the rotation speed is 250rad / s to obtain the first slurry;

[0061] Step 3: drying the slurry; pour out the first slurry obtained in step 2, and dry it in an oven at 100...

Embodiment 3

[0067] A method for preparing an ultra-low loss magnesium-lithium niobate system microwave dielectric ceramic material, characterized in that it comprises the following steps:

[0068] Step 1: batching; raw material MgO, Li 2 CO 3 and Nb 2 o 5 According to the general chemical formula Li 3+0.4 Mg 2 NbO 6 The stoichiometric ratio is compounded, and the purity of the raw materials is greater than 99%;

[0069] Step 2: mixing materials; the raw materials obtained in step 1 are ball milled, and the specific ball milling process is: using zirconia balls as the ball milling medium, and deionized water as the solvent, the raw materials, zirconia balls, and deionized water are mixed according to the mass ratio of 1: 5:3 is placed in a planetary ball mill for wet ball milling, the ball milling time is 6 hours, and the rotation speed is 200rad / s to obtain the first slurry;

[0070] Step 3: drying the slurry; pour out the first slurry obtained in step 2, and dry it in an oven at 1...

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Abstract

An ultra-low loss magnesium-lithium niobate system microwave dielectric ceramic material and a preparation method thereof belong to the technical field of microwave dielectric ceramics. The general chemical formula of the microwave dielectric ceramic material of the present invention is Li 3+ x Mg 2 NbO 6 , where 0.02≤x≤0.08; which behaves as a single phase. The preparation method of the invention comprises the following steps: batching, ball milling, pre-calcination, ball milling, granulation, pressing and molding, and burying and sintering under protective atmosphere. The present invention adopts solid state reaction and sinters the sample buried in the powder of the same composition, the preparation method is simple, the production cost is reduced, and the structure of the obtained ceramic material is stable; the introduction of excess Li and protective atmosphere sintering can solve the problem of Li volatilization and ease The phenomenon of abnormal growth of ceramic grains increases the density and makes it have a very high quality factor. The dielectric properties of the ceramic material of the present invention are as follows: Relative permittivity ε r ==14~16, Q×f=90000~160000GHz, τ f =-20~-36ppm / ℃. The ceramic material of the invention can be widely used in antennas, resonant cavities, filters and other microwave components in communication systems.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramic materials, and in particular relates to an ultra-low loss magnesium lithium niobate system microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are mainly used in microwave frequency bands (mainly UHF, SHF frequency bands, 300MHz~300GHz), and undertake one or more functions in circuits, mainly used as resonators, dielectric waveguide circuits, filters, dielectrics Microwave components such as antennas can be used in mobile communications, satellite communications, and military radars. In order to meet the development needs of microwave mobile communications, microwave dielectric ceramics have become one of the hotspots in the field of microwave dielectric materials research at home and abroad, and have attracted great interest from researchers in recent years. [0003] For different application bac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3203C04B2235/3206
Inventor 张怀武王刚刘成李颉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA