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Ba-Zn-Nb microwave ceramic medium and its preparing process

A microwave dielectric ceramic, barium zinc niobium technology, applied in ceramics, inorganic insulators, etc., can solve the problems of damage to material properties, low performance of LTCC components, and poor quality.

Inactive Publication Date: 2009-05-06
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the glass phase usually greatly damages the material properties, the performance of LTCC components in my country is low and the quality is poor
So far, there have been no reports of barium-zinc-niobium series microwave dielectric ceramics with a sintering temperature near 1000°C and high quality factors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The chemical composition of the present embodiment is: Ba(Zn 1 / 3 Nb 2 / 3 )O 3 -0.005CoO, starting from barium nitrate, zinc nitrate, niobium oxalate and cobalt nitrate with a purity of 99%, and achieved through the following steps:

[0019] 1) With a purity of 99% barium nitrate Ba(NO 3 ) 2 , Zinc nitrate Zn(NO 3 ) 2 .6H 2 O, niobium oxalate H 3 NbO(C 2 o 4 ) 3 4H 2 O, cobalt nitrate Co(NO 3 ) 2 .6H 2 O and citric acid (C 6 h 8 ) 7 .H 2 O is the starting material. Dissolve barium nitrate, zinc nitrate, niobium oxalate and citric acid in a certain amount of deionized water in a certain proportion to form a solution, wherein the total molar ratio of the amount of citric acid added to the metal ions is 1.5:1. Then cobalt nitrate is added in a certain proportion and dissolved;

[0020] 2) Slowly add ammonia water to the solution prepared in step 1 until the pH value reaches 5-8, add it at 80°C and keep stirring to form a transparent sol;

[0021] 3) Dry ...

Embodiment 2

[0026] The chemical composition of the present embodiment is: Ba(Zn 1 / 3 Nb 2 / 3 )O 3 -0.005CoO-O0.005CuO, starting from barium nitrate, zinc nitrate, niobium oxalate, cobalt nitrate and copper nitrate with a purity of 99%, and achieved through the following steps:

[0027] 1) With a purity of 99% barium nitrate Ba(NO 3 ) 2 , Zinc nitrate Zn(NO 3 ) 2 .6H 2 O, niobium oxalate H 3 NbO(C 2 o 4 ) 3 4H 2 O, cobalt nitrate Co(NO 3 ) 2 .6H 2 O, copper nitrate Cu(NO 3 ) 2 .6H 2 O and citric acid (C 6 h 8 ) 7 .H 2 O is the starting material. Dissolve barium nitrate, zinc nitrate, niobium oxalate and citric acid in a certain amount of deionized water in a certain proportion to form a solution, wherein the total molar ratio of the amount of citric acid added to the metal ions is 1.5:1. Then cobalt nitrate and copper nitrate are added in a certain proportion and dissolved;

[0028] 2) Slowly add ammonia water to the solution prepared in step 1 until the pH value reach...

Embodiment 3

[0034] The chemical composition of the present embodiment is: Ba(Zn 1 / 3 Nb 2 / 3 )O 3 -0.005CoO-O0.005CuO-0.01B 2 o 3 , starting with barium nitrate, zinc nitrate, niobium oxalate, cobalt nitrate, copper nitrate and boric acid with a purity of 99%, and achieved through the following steps:

[0035] 1) With a purity of 99% barium nitrate Ba(NO 3 ) 2 , Zinc nitrate Zn(NO 3 ) 2 .6H 2 O, niobium oxalate H 3 NbO(C 2 o 4 ) 3 4H 2 O, cobalt nitrate Co(NO 3 ) 2 .6H 2 O, copper nitrate Cu(NO 3 ) 2 .6H 2 O, boric acid B 2 o 3 .3H 2 O and citric acid (C 6 h 8 ) 7 .H 2 O is the starting material. Dissolve barium nitrate, zinc nitrate, niobium oxalate and citric acid in a certain amount of deionized water in a certain proportion to form a solution, wherein the total molar ratio of the amount of citric acid added to the metal ions is 1.5:1. Then cobalt nitrate, copper nitrate and boric acid are added in a certain proportion and dissolved;

[0036] 2) Slowly add ammon...

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Abstract

The invention relates to a barium-zinc-niobium series microwave dielectric ceramic and a method for preparing the same, which belong to the technical field of microwave dielectric material production. The ceramic comprises the chemical component of Ba(Zn1 / 3Nb2 / 3)O3-XMO(M represents Co, Cu and 2 / 3B), the mol ratio of Ba(Zn1 / 3Nb2 / 3)O3 to MO is 1 to X, and X is between 0.001 and 0.02. According to certain proportion, nitrate, oxalate and citric acid are dissolved into deionized water, and the pH value of the mixed solution is adjusted to between 5 and 8 by ammonia so as to form sol; the sol is dried to be dry gel which is subjected to calcining to form active powder; and the powder is shaped through wet milling and press, and is prepared into the microwave dielectric ceramic by sintering in a high-temperature furnace. The microwave dielectric ceramic can be sintered at different sintering temperatures of between 1,000 and 1,400 DEG C, has medium dielectric constant of between 20 and 40 and high quality factor with Q x f value of between 25,000 and 70,000GHz , and is expected to be widely used for manufacture of various microwave devices.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric material manufacture, and in particular relates to a barium-zinc-niobium series microwave dielectric ceramic and a preparation method thereof. Background technique [0002] With the development of science and technology and the continuous improvement of communication technology, especially the rapid development of modern communication such as mobile communication, satellite communication, global satellite positioning system GPS, Bluetooth technology and wireless local area network WLA, the miniaturization and high performance of microwave circuits and The demand for microwave devices is increasing day by day. Microwave dielectric ceramics are indispensable key components in microwave communication and are widely used. [0003] At present, the microwave dielectric ceramics with the best comprehensive performance are mainly composed of niobium and tantalum. Niobium and tantalum microw...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01B3/12
Inventor 宋申华翁履谦谢筱玲陆正武
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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