CN1101359C - Microwave dielectric ceramic - Google Patents
Microwave dielectric ceramic Download PDFInfo
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- CN1101359C CN1101359C CN 00131518 CN00131518A CN1101359C CN 1101359 C CN1101359 C CN 1101359C CN 00131518 CN00131518 CN 00131518 CN 00131518 A CN00131518 A CN 00131518A CN 1101359 C CN1101359 C CN 1101359C
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- mole
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- microwave
- assumed
- microwave dielectric
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- 239000000919 ceramic Substances 0.000 title claims abstract description 24
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- DYUUGILMVYJEHY-UHFFFAOYSA-N 1-$l^{1}-oxidanyl-4,4,5,5-tetramethyl-3-oxido-2-phenylimidazol-3-ium Chemical compound CC1(C)C(C)(C)N([O])C(C=2C=CC=CC=2)=[N+]1[O-] DYUUGILMVYJEHY-UHFFFAOYSA-N 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 4
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 abstract 4
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 abstract 2
- -1 Sm<2>O3 Inorganic materials 0.000 abstract 1
- 239000006104 solid solution Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
The present invention relates to microwave dielectric ceramics which is solid solution formed by combining BaO, Nd2O3, Sm<2>O3, Bi2O3 and TiO2 and having the structure of Ba<6-3x>(Nd<1-y-z>Sm<y>Bi<z>)<8+2x>Ti<18>O<54>, wherein the content of the BaO is assumed as m, the content of the Nd2O3 is assumed as n(1-y-z), the content of the Sm<2>O3 is assumed as ny, the content of the Bi2O3 is assumed as nz, and the content of TiO2 is assumed as p; 14.0 mole%<=m<=17.6 mole%, 16.0 mole%<=n<=18.0 mole%, 66.0 mole%<=p<=68.0 mole%, and m+n+p=100 mole%; 0.4<=x<=0.75, 0.05<=y<=0.7, and 0.05<=z<=0.2. The dielectric constant of the microwave dielectric ceramics can reach as high as 87 to 106, and the microwave dielectric ceramics has the advantages of low loss and smaller temperature coefficient of resonance frequency.
Description
The present invention relates to the microwave-medium ceramics that the microwave device such as dielectric resonator, wave filter in the communication system is used.
In recent years, along with developing rapidly of mobile communication and satellite communication technology, the demand of the microwave-medium ceramics that microwave devices such as dielectric resonator and wave filter are used is just growing.
For microwave-medium ceramics, at first require it that low dielectric loss (high Q value, Q＞3000 are at applying frequency) is arranged and approach (20ppm/ ℃＜τ of zero temperature coefficient of resonance frequency
f＜20ppm/ ℃, for the lower material series of specific inductivity, requirement-10ppm/ ℃＜τ
f＜10ppm/ ℃), simultaneously, for the needs that satisfy device miniaturization require the high DIELECTRIC CONSTANT of trying one's best.
Though developed a series of microwave-medium ceramics at present, high-k class material (ε＞80) is less for number, even and the highest BaO-Nd of specific inductivity
2O
3-TiO
2Series, its specific inductivity is the highest also can only to reach 90 front and back.In general, its dielectric loss of the material that specific inductivity is big and temperature factor are also bigger.Therefore, 100 specific inductivity once was considered to one threshold that microwave-medium ceramics is difficult to go beyond.This has just limited the expansion of further miniaturization of microwave device and range of application widely.
The purpose of this invention is to provide a kind of have low-loss and good temperature stability, have the microwave-medium ceramics of high-k simultaneously.
Microwave-medium ceramics of the present invention is with BaO, Nd
2O
3, Sm
2O
3, Bi
2O
3And TiO
2The expression formula that combines is mBaO.n[(1-y-z) Nd
2O
3.ySm
2O
3.zBi
2O
3] .pTiO
2, final structure is Ba
6-3x(Nd
1-y-zSm
yBi
z)
8+2xTi
18O
54The sosoloid microwave dielectric pottery, the content of each composition is respectively: the content of establishing BaO is 14.0 moles of %≤m≤17.6 mole %Nd of m
2O
3Content be n (1-y-z) Sm
2O
3Content be nyBi
2O
3Content be nz
16.0 mole %≤n≤18.0 mole %
0.4≤x≤0.75,0.05≤y≤0.7,0.05≤z≤0.2TiO
2Content be 66.0 moles of %≤p≤68.0 of p mole %m+n+p=100% moles
The preferred content of each composition is: m=16.7 mole %, n=16.7 mole, p=66.6 mole %, x=0.5, y=0.15, z=0.18.
The microwave-medium ceramics of invention can be prepared from as follows.
At first, with purity be BaCO more than 99.9%
3, Nd
2O
3, Sm
2O
3, Bi
2O
3And TiO
2Mix 24 hours (solvent is a distilled water) with the wet ball-milling method according to a certain percentage, the oven dry back is given in 1000-1150 ℃, air atmosphere and being burnt 3 hours.Then, in giving the burning powder, after interpolation binding agent and the granulation, be formed in 1000kg/cm by uniaxial tension
2Pressure under prepare the ceramic body of diameter 12mm, thickness 3～6mm, at last in 1300～1360 ℃, air atmosphere sintering 3 hours to prepare required microwave-medium ceramics.
Carried out material phase analysis with the ceramic sample of powder method of X-ray diffraction after, confirmed that its crystalline structure is Ba sintering
6-3x(Nd
1-y-zSm
yBi
z)
8+2xTi
18O
54Sosoloid, and carried out the evaluation of microwave dielectric property at 3GHz with the cylindrical dielectric resonator method.
Table 1 shows several specific exampless and the micro-wave dielectric constant thereof that constitutes each component content of the present invention.
As known from Table 1, in ceramic systems of the present invention, along with the increase and the Nd of BaO content (m)
2O
3, Sm
2O
3And Bi
2O
3Content (n) and TiO
2The minimizing of content (p), DIELECTRIC CONSTANT are tending towards increasing and Qf value (Q is that quality factor are the inverse of dielectric loss, and f is a resonant frequency) is tending towards reducing, while temperature coefficient of resonance frequency τ
fBe tending towards increasing.
Microwave-medium ceramics provided by the invention, its specific inductivity be up to 87～106, and have low-loss and less temperature coefficient of resonance frequency simultaneously, and the specific inductivity of particularly having broken through microwave-medium ceramics is generally less than 100 " threshold ".And utilize microwave-medium ceramics provided by the invention, can make the further miniaturization of microwave devices such as dielectric resonator and wave filter become possibility.Simultaneously, pottery provided by the invention also can be applicable to radio ceramics electrical condenser or temperature compensating ceramic capacit etc.Therefore, the present invention has great value industrial.
Table 1
| m (mol％) | n (mol％) | p (mol％) | x | y | z | ε | Qf (GHz) | τ f(ppm/℃) |
| 19.1 | 15.5 | 65.4 | 0.25 | 0.12 | 0.18 | 125 | 2500 | 40 |
| 17.6 | 16.2 | 66.2 | 0.4 | 0.12 | 0.18 | 106 | 5200 | -18 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.05 | 0.18 | 100 | 5600 | -13 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.12 | 0.18 | 105 | 6000 | -5 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.15 | 0.18 | 106 | 5800 | -3 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.60 | 0.18 | 87 | 7000 | -3 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.20 | 0.15 | 99 | 5860 | -20 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.41 | 0.15 | 99 | 5980 | -3 |
| 16.7 | 16.7 | 66.6 | 0.5 | 0.60 | 0.15 | 96 | 6200 | -8 |
| 15.0 | 17.5 | 67.5 | 0.67 | 0.12 | 0.18 | 102 | 7500 | -2 |
| 14.2 | 17.9 | 67.9 | 0.75 | 0.12 | 0.18 | 99 | 7600 | -4 |
| 13.6 | 18.2 | 68.2 | 0.8 | 0.12 | 0.18 | 85 | 4800 | -18 |
Claims (2)
1. microwave-medium ceramics is characterized in that it is with BaO, Nd
2O
3, Sm
2O
3, Bi
2O
3And TiO
2The expression formula that combines is mBaO.n[(1-y-z) Nd
2O
3.ySm
2O
3.zBi
2O
3] .pTiO
2, final structure is Ba
6-3x(Nd
1-y-zSm
yBi
z)
8+2xTi
18O
54The sosoloid microwave dielectric pottery, the content of each composition is respectively: the content of establishing BaO is 14.0 moles of %≤m≤17.6 mole %Nd of m
2O
3Content be n (1-y-z) Sm
2O
3Content be nyBi
2O
3Content be nz
16.0 mole %≤n≤18.0 mole %
0.4≤x≤0.75,0.05≤y≤0.7,0.05≤z≤0.2TiO
2Content be 66.0 moles of %≤p≤68.0 of p mole %m+n+p=100% moles.
2. by the described microwave-medium ceramics of claim 1, it is characterized in that the content of each composition is: m=16.7 mole %, n=16.7 mole, p=66.6 mole %, x=0.5, y=0.15, z=0.18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00131518 CN1101359C (en) | 2000-10-24 | 2000-10-24 | Microwave dielectric ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00131518 CN1101359C (en) | 2000-10-24 | 2000-10-24 | Microwave dielectric ceramic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1349952A CN1349952A (en) | 2002-05-22 |
| CN1101359C true CN1101359C (en) | 2003-02-12 |
Family
ID=4594695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00131518 Expired - Fee Related CN1101359C (en) | 2000-10-24 | 2000-10-24 | Microwave dielectric ceramic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1101359C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100590095C (en) * | 2007-11-22 | 2010-02-17 | 郴州高斯贝尔数码科技有限公司 | Environment friendly ka band microwave dielectric ceramic |
| JP2010215488A (en) * | 2009-02-17 | 2010-09-30 | Sumitomo Chemical Co Ltd | Aluminum titanate-based ceramics |
| CN101913798B (en) * | 2010-08-18 | 2012-07-04 | 郴州功田电子陶瓷技术有限公司 | Environment friendly microwave medium ceramic substrate |
| CN102093046A (en) * | 2010-12-10 | 2011-06-15 | 厦门松元电子有限公司 | BaO-Ln2O3-TiO2-series microwave capacitor medium material and preparation method thereof |
| CN103086711A (en) * | 2011-10-27 | 2013-05-08 | 中国钢铁股份有限公司 | Microwave dielectric material system and manufacturing method thereof |
| CN102531571B (en) * | 2012-02-23 | 2013-05-22 | 华中科技大学 | High-Q-value medium-dielectric-constant microwave dielectric ceramic and preparation method thereof |
| CN105130420A (en) * | 2015-08-27 | 2015-12-09 | 电子科技大学 | Ca-Nd-Ti system moderate temperature co-fired ceramic, and preparation method therefor |
| CN110590395B (en) * | 2019-10-08 | 2020-10-16 | 清华大学 | Lightweight porous high-Q microwave dielectric ceramic and preparation method thereof |
-
2000
- 2000-10-24 CN CN 00131518 patent/CN1101359C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1349952A (en) | 2002-05-22 |
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