Magnesium-zircon-germanium-niobium microwave dielectric ceramic with low dielectric constant and ultra-low dielectric loss and preparation method and application

A technology of microwave dielectric ceramics and low dielectric constant, which is applied in the field of ceramic compositions, can solve the problems of large dielectric constant and lack of ultra-low dielectric loss material system, and achieve the improvement of dielectric constant, no pollution in the process, and the preparation process simple effect

Inactive Publication Date: 2019-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the dielectric theory, the dielectric constant of the material and the Q×f value usually show a negative correlation, that is, the increase of the dielectric constant is often accompanied by the decrease of the Q×f value, so it has a large dielectric constant and an ultra-low dielectric constant at the same time. Consumable material system is very lacking
On the other hand, although microwave dielectric ceramics have been extensively studied and a series of new microwave dielectric materials are emerging, they have low dielectric constant (20r <35) There are few reports on low-loss microwave dielectric ceramic systems

Method used

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  • Magnesium-zircon-germanium-niobium microwave dielectric ceramic with low dielectric constant and ultra-low dielectric loss and preparation method and application
  • Magnesium-zircon-germanium-niobium microwave dielectric ceramic with low dielectric constant and ultra-low dielectric loss and preparation method and application
  • Magnesium-zircon-germanium-niobium microwave dielectric ceramic with low dielectric constant and ultra-low dielectric loss and preparation method and application

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Experimental program
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Embodiment 1

[0033]A method for preparing magnesium-zirconium-germanium-niobium series microwave dielectric ceramics with low dielectric constant and ultra-low dielectric loss, specifically comprising the following steps:

[0034] (1) According to the microwave dielectric ceramic composition Mg (Zr 1-x Ge x )Nb 2 o 8 (x=0.1), said MgO-1.8855g, ZrO 2 -5.1886g, GeO2-0.4895g, Nb 2 o 5 -12.4364g of ingredients, 20g in total; the mixed powder is added to the ball mill tank, after adding 160ml of deionized water and 150g of zirconium balls, ball mill on a planetary ball mill for 6 hours, and the speed of the ball mill is 1000 rpm;

[0035] (2) Place the raw material after ball milling under the temperature condition of 110° C. to dry, and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0036] (3) Calcining the powder with uniform particles at 1100°C for 3 hours;

[0037] (4) Put the calcined powder into a ball mill jar, add deionized water and zirconia balls, mil...

Embodiment 2

[0040] A method for preparing magnesium-zirconium-germanium-niobium-based microwave dielectric ceramics with low dielectric constant and ultra-low dielectric loss, the basic steps of which are basically the same as in Example 1, except that in step (1) according to the composition of microwave dielectric ceramics Mg(Zr 1-x Ge x )Nb 2 o 8 (x=0.2), said MgO-1.8937g, ZrO 2 -4.6322g, GeO2-0.9833g, Nb 2 o 5 -12.4907g batching, totally 20g, afterward step is identical with embodiment 1.

Embodiment 3

[0042] A method for preparing magnesium-zirconium-germanium-niobium-based microwave dielectric ceramics with low dielectric constant and ultra-low dielectric loss, the basic steps of which are basically the same as in Example 1, except that in step (1) according to the composition of microwave dielectric ceramics Mg(Zr 1-x Ge x )Nb 2 o 8 (x=0.3), said MgO-1.9021g, ZrO 2 -4.0710g, GeO2-1.4815g, Nb 2 o 5 -12.5455g batching, totally 20g, afterward step is identical with embodiment 1.

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Abstract

The invention discloses magnesium-zircon-germanium-niobium microwave dielectric ceramic with a low dielectric constant and an ultra-low dielectric loss and a preparation method and an application. A chemical expression of the microwave dielectric ceramic is Mg(Zr1-xGex)Nb2O8, wherein x is greater than 0 and less than or equal to 0.4. The preparation method comprises the following steps of: (1) preparing raw materials according to the chemical formula Mg(Zr1-xGex)Nb2O8 (x greater than 0 and less than or equal to 0.4), adding a certain proportion of deionized water and zirconia grinding media for ball milling on a ball mill, (2) drying the raw materials ball-milled in step (1), screening the raw materials with a 40-mesh sieve to form even grained powder, (3) calcining the powder in step (2),(4) performing secondary ball milling, drying and pelletizing on the ceramic powder prefired in step (3), screening the ceramic powder with a 60-mesh sieve, pressing the powder into a green body through a powder compressing machine, and (5) sintering the green body in step (4) at 1260-1320 DEG C for 3-6h to form the magnesium-zircon-germanium-niobium microwave dielectric ceramic. The microwave dielectric ceramic is applied in the field of communication. According to the microwave dielectric ceramic, the very excellent microwave dielectric property can be obtained only by partially replacing zircon ions with micro germanium ions.

Description

technical field [0001] The invention belongs to a kind of ceramic composition characterized by components, and specifically relates to a kind of microwave dielectric ceramics based on magnesium, zirconium and niobium series, and a small amount of germanium ions are used to replace zirconium ions to obtain a ceramic composition with low dielectric constant and ultra-low dielectric loss. Magnesium-zirconium-germanium-niobium series microwave dielectric ceramics and its preparation method and application. Background technique [0002] The rapid development of modern mobile communication has promoted the rapid development of various microwave mobile communication terminal equipment in the direction of miniaturization, light weight, multi-function and low cost. Microwave dielectric ceramics are key materials for microwave components such as resonators, filters, and dielectric substrates used in modern mobile communications, satellite communications, and military radars. Microwav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 肖谧何苏苏娄捷
Owner TIANJIN UNIV
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