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Yttrium-free high-dielectric-constant microwave ferrite material and preparation method and device thereof

A technology of ferrite material and high dielectric constant, which is applied in the field of high dielectric constant microwave ferrite material and its preparation, can solve the problems of unfavorable device application and high insertion loss, reduce the degree of deterioration and increase the dielectric constant , cost reduction effect

Pending Publication Date: 2021-02-23
深圳顺络微波器件有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some studies on yttrium-free high-dielectric microwave ferrite materials, such as patent CN107417266A disclosing a rare-earth-free garnet ferrite material, whose molecular formula is Bi 3-(2a+b+c+m+n) Ca 2a+b+c+m+ n V a Zr b sn c In d Ti m Ge n Fe 5-a-b-c-d-m-n-δ o 12 , the corresponding dielectric constant of the material is above 20 (not specific), and the line width is lower than 87Oe (≤7KA / m), but the line width is already very high, which is not conducive to device application (insertion loss is too high), and 4πMs is not specific

Method used

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  • Yttrium-free high-dielectric-constant microwave ferrite material and preparation method and device thereof

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preparation example Construction

[0056] The preparation method of the high dielectric constant microwave ferrite material of a specific embodiment comprises the following steps:

[0057] 1) According to the molecular formula Bi 1.2 Ca 1.8-1.2a-0.5b-x-y-z V a al b Zr x Mg y Zn z Fe 4.95-a-b-x-y-z o 12 (a=0.1-0.2, b=0.1-0.2, x=0.3-0.5, y=0.02-0.1, z=0.02-0.1). The stoichiometric ratio, calculate the ratio of the required raw materials, weigh the raw materials, the corresponding raw materials are respectively Bi 2 o 3 , CaCO 3 , V 2 o 5 、Al 2 o 3 , ZrO 2 , MgO, ZnO, Fe 2 o 3 . Preferably, the raw materials are analytically pure, the MgO and ZnO are nanoscale, the D50 is 100nm-200nm, the MgO and ZnO are nearly spherical in shape, and the specific surface area is 60-70m 2 / g.

[0058] 2) Ball mill mixing: Put the raw materials weighed in step 1) into the ball mill, add the corresponding zirconium balls and pure water according to the ratio of raw materials: zirconium balls: pure water = 1:3.5:1...

Embodiment 1

[0065] According to molecular formula Bi 1.2 Ca 1.29 V 0.1 al 0.1 Zr 0.3 Mg 0.02 Zn 0.02 Fe 4.41 o 12The stoichiometric ratio is calculated, the ratio of the required raw materials is calculated, the raw materials are weighed, and then mixed by ball milling, pre-fired at 850°C for 6 hours, finely milled by ball milling, spray granulated, pressed and formed, and finally sintered at 1060°C and held for 5 hours. A microwave ferrite material is obtained. After testing, the characteristics of the microwave ferrite material are: ε=24.3, 4πMs=1647Gs, ΔH=47Oe, Tc=198°C.

Embodiment 2

[0067] According to molecular formula Bi 1.2 Ca 0.785 V 0.2 Al 0.15 Zr 0.5 Mg 0.1 Zn 0.1 Fe 3.9 o 12 The stoichiometric ratio is calculated, the ratio of the required raw materials is calculated, the raw materials are weighed, and then mixed by ball milling, pre-fired at 750°C for 6 hours, finely ground by ball milling, spray granulation, compression molding, and finally sintered at 1000°C and held for 5 hours. A microwave ferrite material is obtained. After testing, the characteristics of the microwave ferrite material are: ε=25.9, 4πMs=1419Gs, ΔH=46Oe, Tc=206°C.

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Abstract

The invention provides a yttrium-free high-dielectric-constant microwave ferrite material and a preparation method and device thereof. The chemical formula of the microwave ferrite material is Bi1.2Ca1.8-1.2a -0.5b-x-y-zVaAlbZrxMgyZnzFe4.95-a-b-x-y-zO12, wherein a is equal to 0.1-0.2, b is equal to 0.1-0.2, x is equal to 0.3-0.5, y is equal to 0.02-0.1 and z is equal to 0.02-0.1. The preparation method comprises the following steps of: preparing Bi1.2Ca1.8-1.2a -0.5b-x-y-zVaAlbZrxMgyZnzFe4.95-a-b-x-y-zO12 according to the stoichiometric ratio that a is 0.1-0.2, b is 0.1-0.2, x is 0.3-0.5, y is0.02-0.1 and z is 0.02-0.1, and the microwave ferrite material is prepared by using the raw materials. The material disclosed by the invention has the characteristics of low cost, high dielectric constant and the like, the dielectric constant is 24-26, 4piMs is 1400-1650Gs, delta H is less than 50Oe, and Tc is greater than 190 DEG C, so that the application of a microwave ferrite device can be well met, and the problems of miniaturization and the like of the microwave device are solved.

Description

technical field [0001] The invention relates to the field of microwave communication magnetic materials, in particular to a microwave ferrite material with high dielectric constant and a preparation method and device without yttrium formula. Background technique [0002] The dielectric constant of existing microwave ferrite materials is between 12 and 16. When designing low-frequency circulators, the device size is too large, which cannot meet the needs of miniaturization and integration. If the dielectric constant of the ferrite is increased to more than 20, the size of the isolator circulator can be reduced by more than 20%, meeting the requirements of miniaturization and integration. [0003] Most of the current high dielectric constant garnet microwave ferrite materials contain rare earth Y 2 o 3 , such as the patent CN111285673A discloses a garnet microwave ferrite material, the dielectric constant is about 28, and its molecular formula is Bi 1.25 Ca 0.25+2x Y 1.5-...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2633C04B35/622C04B2235/3208C04B2235/3206C04B2235/3217C04B2235/3244C04B2235/3284C04B2235/3272C04B2235/3298C04B2235/3239C04B2235/5445C04B2235/5409C04B2235/5427C04B2235/602C04B2235/608C04B2235/656C04B2235/6562C04B2235/6567
Inventor 布莱恩·穆雷聂敏刘剑
Owner 深圳顺络微波器件有限公司
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