CN108439973A - A kind of high q-factor high-dielectric constant microwave-medium ceramics material and preparation method thereof - Google Patents

A kind of high q-factor high-dielectric constant microwave-medium ceramics material and preparation method thereof Download PDF

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CN108439973A
CN108439973A CN201810043275.1A CN201810043275A CN108439973A CN 108439973 A CN108439973 A CN 108439973A CN 201810043275 A CN201810043275 A CN 201810043275A CN 108439973 A CN108439973 A CN 108439973A
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dielectric constant
medium ceramics
factor
powder
ceramics material
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李玲霞
陈思亮
于仕辉
郑浩然
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Tianjin University
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Abstract

The invention discloses a kind of high q-factor high-dielectric constant microwave-medium ceramics material, chemical formula Sr1‑xLa2x/3TiO3, wherein 0 ＜ x ＜ 1.0.First by raw material SrCO3、La2O3、TiO2Dispensing is weighed by chemical formula to calcine 4 hours at 1150 DEG C through mill, drying, sieving, synthesizes principal crystalline phase；After granulation, then using the pressure compression moulding of 2MPa as green body；Green body keeps the temperature 6 hours, high q-factor high-dielectric constant microwave-medium ceramics material is made in 1300 DEG C of sintering.The permittivity ε of the present inventionrIt is 49.2~296, quality factor q f values are 3000GHz~15243GHz, temperature coefficient of resonance frequency τf42 × 10‑6/ DEG C~1580 × 10‑6/ DEG C within the scope of.

Description

A kind of high q-factor high-dielectric constant microwave-medium ceramics material and preparation method thereof
Technical field
The ceramic composition that the invention belongs to a kind of characterized by ingredient, more particularly to one kind is with Sr1-xLa2x/3TiO3(0 ＜ X ＜ 1.0) it is chemical formula, the microwave dielectric ceramic materials and preparation method thereof with high q-factor high-k
Background technology
In recent years, demand of the mobile communication technology of rapid advances to microwave device is constantly promoted.Microwave-medium ceramics because Its excellent performance is got the attention.Microwave-medium ceramics dielectric loss is low, dielectric constant is high, temperature coefficient of resonance frequency Can nearly zero, be commonly used in microwaves skills such as phase shifter, filter, dielectric resonator, resonator oscillator, microwave-medium antennas Art every field.
As application of the microwave technology in wireless communication system is constantly taken seriously, the exploitation to microwave dielectric ceramic materials It studies around the ultralow dielectric loss of pursuit (especially medium dielectric constant microwave medium class) and explores more high relative dielectric constant (εr＞ 100) two aspect of new material system is carried out.Currently, the micromation of microwave-medium ceramics component forward direction, low-loss, high stable, The direction of chip type and low cost is developed, and developing high dielectric constant material and reducing its loss has important meaning to reducing device volume Justice.
Invention content
The purpose of the present invention is to further increase SrTiO on the basis of existing technology3The Qf values of ceramic material simultaneously subtract Small τfValue, to adapt to electronic information technology high frequency and digitized developing direction.One kind is provided with SrCO3、La2O3、TiO2For Raw material is prepared a kind of with the low τ of high q-factor high quality factor by simple solid phase methodfThe microwave dielectric ceramic materials of value.
The present invention is achieved by following technical solution.
A kind of high q-factor high-dielectric constant microwave-medium ceramics material, chemical formula Sr1-xLa2x/3TiO3, wherein 0 ＜ x ＜ 1.0。
The preparation method of above-mentioned high q-factor high-dielectric constant microwave-medium ceramics material, specific implementation step are as follows：
(1) by raw material SrCO3、La2O3、TiO2By Sr1-xLa2x/3TiO3The chemical formula of wherein 0 ＜ x ＜ 1.0 weighs dispensing；
(2) powder that step (1) is prepared is put into ball grinder, zirconia ball and absolute ethyl alcohol, ball milling 6 hours is added； The raw material after ball milling is placed in infrared drying oven again and is dried, 40 mesh sieve is crossed after drying, obtains evengranular powder；
(3) by step (2), treated that powder is calcined 4 hours at 1150 DEG C, synthesizes principal crystalline phase；
(4) polyvinyl alcohol that additional mass percent is 0.75% in the powder that step (3) synthesizes principal crystalline phase, is put into ball In grinding jar, zirconia ball and absolute ethyl alcohol is added, ball milling 12 hours crosses 80 mesh sieve after drying, then with powder compressing machine with 2MPa Pressure compression moulding be green body；
(5) step (4) green body after molding is kept the temperature 6 hours, the high dielectric of high q-factor is made in 1300~1350 DEG C of sintering Constant microwave dielectric ceramic materials.
The drying temperature of the step (2) and step (4) is 100 DEG C.
The mass ratio of the ceramic powder of the step (2) and step (4) and zirconia ball, deionized water is 1：1：2.
The green body of the step (4) is the disc green body of Φ 10mm × 5mm.
Originally provide a kind of high-k, low-dielectric loss, low resonant frequency temperature coefficient micro- matter wave be situated between ceramic material Material and preparation method thereof, Sr obtained1-xLa2x/3TiO3(0 ＜ x ＜ 1.0) material dielectric constant εrBe 49.2~296, quality because Number Qf values are 3000GHz~15243GHz, temperature coefficient of resonance frequency τf42 × 10-6/ DEG C~1580 × 10-6/ DEG C range It is interior.This method improves the quality factor of microwave dielectric ceramic materials, while significantly reducing τfValue.
Specific implementation mode
The present invention is with SrCO3(analysis is pure), La2O3(analysis is pure), TiO2(analysis is pure) is initial feed, by simply solid Phase synthesi prepares microwave-medium ceramics.Specific embodiments of the present invention are as follows：
1. by raw material SrCO3、La2O3、TiO2Stoichiometrically formula Sr1-xLa2x/3TiO3(0 ＜ x ＜ 1.0).By about 15g's Mixed powder is put into nylon tank, and 200ml absolute ethyl alcohols, after the zirconium ball of 150g is added, ball milling 6 on planetary ball mill is added Hour, rotating speed is 400 revs/min；
2. the raw material after ball milling is placed in drying box, 40 mesh sieve is crossed after 100 DEG C of drying；
3. the powder after drying sieving is put into moderate oven, in 1150 DEG C of pre-burnings, 4 hours are kept the temperature；
4. the polyvinyl alcohol of addition 0.75% is mixed as adhesive in the powder after step 3 pre-burning, it is put into ball In grinding jar, be added zirconia ball and/or absolute ethyl alcohol, ball milling 12 hours crosses 80 mesh sieve after drying, then with powder compressing machine with The pressure of 2MPa is pressed into green body；
5. green compact are sintered at 1300 DEG C, 6 hours are kept the temperature, high-permittivity microwave medium ceramics are made.
6. testing the microwave property of resulting product by Network Analyzer.
The main technologic parameters and its microwave dielectric property of the specific embodiment of the invention refer to table 1.
Table 1
The present invention is not limited to the above embodiment, and the variation of some details is possible, but therefore this does not violate this hair Bright scope and spirit.

Claims (4)

1. a kind of high q-factor high-dielectric constant microwave-medium ceramics material, chemical formula Sr1-xLa2x/3TiO3, wherein 0 ＜ x ＜ 1.0.
The preparation method of above-mentioned high q-factor high-dielectric constant microwave-medium ceramics material, specific implementation step are as follows：
(1) by raw material SrCO3、La2O3、TiO2By Sr1-xLa2x/3TiO3The chemical formula of wherein 0 ＜ x ＜ 1.0 weighs dispensing；
(2) powder that step (1) is prepared is put into ball grinder, zirconia ball and absolute ethyl alcohol, ball milling 6 hours is added；Again will Raw material after ball milling, which is placed in infrared drying oven, dries, and 40 mesh sieve is crossed after drying, obtains evengranular powder；
(3) by step (2), treated that powder is calcined 4 hours at 1150 DEG C, synthesizes principal crystalline phase；
(4) polyvinyl alcohol that additional mass percent is 0.75% in the powder that step (3) synthesizes principal crystalline phase, is put into ball grinder In, zirconia ball and absolute ethyl alcohol is added, ball milling 12 hours crosses 80 mesh sieve after drying, then with powder compressing machine with the pressure of 2MPa Power compression moulding is green body；
(5) step (4) green body after molding is kept the temperature 6 hours, high q-factor high-k is made in 1300~1350 DEG C of sintering Microwave dielectric ceramic materials.
2. a kind of high q-factor high-dielectric constant microwave-medium ceramics material according to claim 1, which is characterized in that described The drying temperature of step (2) and step (4) is 100 DEG C.
3. a kind of high q-factor high-dielectric constant microwave-medium ceramics material according to claim 1, which is characterized in that described The mass ratio of the ceramic powder of step (2) and step (4) and zirconia ball, deionized water is 1：1：2.
4. a kind of high q-factor high-dielectric constant microwave-medium ceramics material according to claim 1, which is characterized in that described The green body of step (4) is the disc green body of Φ 10mm × 5mm.
CN201810043275.1A 2018-01-17 2018-01-17 A kind of high q-factor high-dielectric constant microwave-medium ceramics material and preparation method thereof Pending CN108439973A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110028318A (en) * 2018-10-17 2019-07-19 南京微瓷新材料科技有限公司 A kind of high-quality-factor SrTiO3Base media ceramic and preparation method thereof
CN111217596A (en) * 2018-11-23 2020-06-02 中国科学院上海硅酸盐研究所 Lead-free piezoelectric ceramic material with high Curie temperature and large electrostrictive strain and preparation method thereof
CN112250434A (en) * 2020-10-23 2021-01-22 厦门松元电子有限公司 ZMAT series microwave ceramic material and preparation method and application thereof
CN113185280A (en) * 2021-04-27 2021-07-30 四川海祥电子科技有限公司 Preparation method of high-Qf microwave dielectric material
CN116693284A (en) * 2023-06-09 2023-09-05 山东云海国创云计算装备产业创新中心有限公司 Dielectric material, preparation method thereof, capacitor and random dynamic memory

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601271A (en) * 2016-01-13 2016-05-25 南京攀思特电子科技有限公司 Middle-permittivity microwave dielectric ceramic and manufacturing method thereof
CN107311646A (en) * 2017-06-19 2017-11-03 天津大学 A kind of preparation method for improving strontium titanate ceramicses dielectric material performance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601271A (en) * 2016-01-13 2016-05-25 南京攀思特电子科技有限公司 Middle-permittivity microwave dielectric ceramic and manufacturing method thereof
CN107311646A (en) * 2017-06-19 2017-11-03 天津大学 A kind of preparation method for improving strontium titanate ceramicses dielectric material performance

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110028318A (en) * 2018-10-17 2019-07-19 南京微瓷新材料科技有限公司 A kind of high-quality-factor SrTiO3Base media ceramic and preparation method thereof
CN110028318B (en) * 2018-10-17 2021-11-12 南京微瓷新材料科技有限公司 High-quality factor SrTiO3Base medium ceramic and preparation method thereof
CN111217596A (en) * 2018-11-23 2020-06-02 中国科学院上海硅酸盐研究所 Lead-free piezoelectric ceramic material with high Curie temperature and large electrostrictive strain and preparation method thereof
CN111217596B (en) * 2018-11-23 2021-08-31 中国科学院上海硅酸盐研究所 Lead-free piezoelectric ceramic material with high Curie temperature and large electrostrictive strain and preparation method thereof
CN112250434A (en) * 2020-10-23 2021-01-22 厦门松元电子有限公司 ZMAT series microwave ceramic material and preparation method and application thereof
CN113185280A (en) * 2021-04-27 2021-07-30 四川海祥电子科技有限公司 Preparation method of high-Qf microwave dielectric material
CN113185280B (en) * 2021-04-27 2022-06-28 四川海祥电子科技有限公司 Preparation method of high-Qf microwave dielectric material
CN116693284A (en) * 2023-06-09 2023-09-05 山东云海国创云计算装备产业创新中心有限公司 Dielectric material, preparation method thereof, capacitor and random dynamic memory

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Application publication date: 20180824