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Ultralow-loss zirconium magnesium niobate system microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and zirconium magnesium niobate, which is applied in the field of ultra-low loss zirconium magnesium niobate system microwave dielectric ceramic materials and its preparation, can solve the problems of high sintering temperature and lower ceramic quality factor, and achieve simple preparation process, Effects of enhancing lattice energy and bond energy, and increasing grain size

Active Publication Date: 2021-05-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its sintering temperature is high (≥1350°C) and the value of Q×f still has room for further optimization.
Low melting point additives can properly reduce MgZrNb 2 o 8 The sintering temperature of ceramics, but also introduces the second phase, which reduces the quality factor of ceramics (Effect of H 3 BO 3 addition on the interring behavior and microwave dielectric properties of wolframite-typeMgZrNb 2 o 8 ceramics)

Method used

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  • Ultralow-loss zirconium magnesium niobate system microwave dielectric ceramic material and preparation method thereof
  • Ultralow-loss zirconium magnesium niobate system microwave dielectric ceramic material and preparation method thereof
  • Ultralow-loss zirconium magnesium niobate system microwave dielectric ceramic material and preparation method thereof

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Embodiment 1

[0040] This embodiment provides a microwave dielectric ceramic material with a chemical formula of Mg 0.98 Cu 0.02 ZrNb 2 o 8 , whose crystal phase is pure phase MgZrNb 2 o 8 . X-ray diffraction (XRD) patterns such as figure 1 In b, the SEM picture is as follows figure 2 b in b; it can be seen from the figure that the grain morphology is polyhedral shape.

[0041] The preparation method of the ultra-low loss zirconium magnesium niobate system microwave dielectric ceramic material comprises the following steps:

[0042] Step 1: batching; raw materials MgO, CuO, ZrO 2 and Nb 2 o 5 According to the chemical formula Mg 0.98 Cu 0.02 ZrNb 2 o 8 , the stoichiometric ratio of the batching, the purity of the raw materials are greater than 99%;

[0043] 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 materi...

Embodiment 2

[0050] This embodiment provides a microwave dielectric ceramic material with a chemical formula of Mg 0.96 Cu 0.04 ZrNb 2 o 8 , whose crystal phase is pure phase MgZrNb 2 o 8 . X-ray diffraction (XRD) patterns such as figure 1 In c, the SEM image is as follows figure 2 In c; it can be seen from the figure that the grain morphology is the coexistence of polyhedron and rod shape.

[0051] A method for preparing an ultra-low loss zirconium magnesium niobate system microwave dielectric ceramic material, comprising the following steps:

[0052] Step 1: batching; raw materials MgO, CuO, ZrO 2 and Nb 2 o 5 According to the chemical formula Mg 0.96 Cu 0.04 ZrNb 2 o 8 The stoichiometric ratio is compounded, and the purity of the raw materials is greater than 99%;

[0053] 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 sol...

Embodiment 3

[0060] This embodiment provides a microwave dielectric ceramic material with a chemical formula of Mg 0.94 Cu 0.06 ZrNb 2 o 8 , whose crystal phase is pure phase MgZrNb 2 o 8 . X-ray diffraction (XRD) patterns such as figure 1 In d, the SEM image is as follows figure 2 d in the figure; it can be seen from the figure that the grain morphology is the coexistence of polyhedron and rod-like shape.

[0061] A method for preparing an ultra-low loss zirconium magnesium niobate system microwave dielectric ceramic material, comprising the following steps:

[0062] Step 1: batching; raw materials MgO, CuO, ZrO 2 and Nb 2 o 5 According to the chemical formula Mg 0.94 Cu 0.06 ZrNb 2 o 8 The stoichiometric ratio is compounded, and the purity of the raw materials is greater than 99%;

[0063] 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 w...

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Abstract

The invention provides an ultralow-loss zirconium magnesium niobate system microwave dielectric ceramic material and a preparation method thereof, the chemical general formula is Mg1-xCuxZrNb2O8, x is more than 0 and less than or equal to 0.1, and the crystal phase is pure phase MgZrNb2O8; the microwave dielectric ceramic material is prepared from MgO, CuO, ZrO2 and Nb2O5 according to the general chemical formula of Mg (1-x) CuxZrNb2O8 according to certain stoichiometric ratio, wherein 0<x<=0.1; after first ball-milling and mixing, pre-sintering is carried out for 2-6 hours at the temperature of 1000-1100 DEG C, after ball-milling and mixing for the second time, granulating, forming, and sintering are carried out for 2-6 hours at the temperature of 1150-1350 DEG C to obtain the product. According to the invention, Mg site in MgZrNb2O8 ceramic is replaced by Cu ions, and a crystal structure is finely adjusted, so that lattice energy and bond energy are enhanced. Cu ion substitution improves the density of the ceramic and increases the grain size, thereby improving the quality factor of the ceramic material.

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 zirconium magnesium 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 are key materials for microwave components such as resonators, filters, antennas, etc. used in mobile communications, satellite communications, and military radars. . In order to meet the requirements of miniaturization, light weight, multi-function and low cost of equipment, microwave dielectric ceramics have become one of the hot spots in the research field of microwave dielectric materials at home and abroad, and have attracted great interest of researchers in recent years. In order to meet the requirements of devices, microwave dielectric ceramic materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3206C04B2235/3281C04B2235/3244C04B2235/3251Y02P20/10
Inventor 张岱南王刚刘成张怀武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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