CN106946559A - Spinelle complex ferrite material and preparation method - Google Patents

Spinelle complex ferrite material and preparation method Download PDF

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CN106946559A
CN106946559A CN201710148832.1A CN201710148832A CN106946559A CN 106946559 A CN106946559 A CN 106946559A CN 201710148832 A CN201710148832 A CN 201710148832A CN 106946559 A CN106946559 A CN 106946559A
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CN106946559B (en
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郭荣迪
余忠
孙科
蒋晓娜
兰中文
王伟
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Sunshine Electronic Technology Co ltd
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University of Electronic Science and Technology of China
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Abstract

Spinelle complex ferrite material and preparation method, belong to Ferrite Material preparing technical field, and Ferrite Material component of the invention includes：Li owner expects that formula uses 67.0~74.0mol%Fe2O3, 16.0~24.0mol%ZnO, 2.0~17.0mol%Li2CO3；Ni owner expects that formula uses 47.0~48.5mol%Fe2O3, 18.0~19.5mol%ZnO, 25.0~26.5mol%NiO, 5.5~10.0mol%CuO；In mass ratio, Li owner expects:Ni owner's material=1:99~99:1；Also include additive, by weight percentage, calculated with oxide：0.10~1.00wt%Bi2O3, 0.01~0.10wt%V2O5, 0.60~0.70wt%BST, 0.001~0.05wt%CaO.The characteristics of present invention has low-loss, high-curie temperature and low-coercivity.

Description

Spinelle complex ferrite material and preparation method
Technical field
The invention belongs to Ferrite Material preparing technical field, more particularly to low-loss, high-curie temperature (Tc) and it is low strong Stupid power (Hc) Li systems and Ni system spinel complex ferrite materials and preparation method thereof.
Background technology
Ferrite microwave device (such as phase shifter, circulator) has load power height, low advantage is lost, for a long time Played an important role in phased-array radar.As radar develops to high frequency, lightness direction, to applied to iron therein Oxysome microwave device proposes more new demands, and such as miniaturization, the low, stability of loss are high.Therefore, carry out high band to use Low-loss microwave ferrite material research has vital effect to reduction microwave device loss.
Li based ferrites in spinel-type have high saturation and magnetic intensity, can be good at meeting high band microwave device To the requirement applied to Ferrite Material saturation magnetization therein；Li based ferrite square magnetic characteristics are good, are conducive to phase shifter It is operated in remnant magnetism state；Li based ferrite Curie temperature is typically larger than 400 DEG C, with good temperature stability, contributes to drop The differential phase shift error of low phase shifter.However, LiZn ferrites have higher ferromagnetic resonance line width, about 10.4~13.5kA/m, Cause microwave device that there is higher insertion loss.Compared to Li systems, Ni series ferrite materials have relatively low magnetocrystalline different The advantages of property and higher density, therefore it has relatively low ferromagnetic resonance line width (6.4kA/m).By Li systems and Ni series ferrite materials It is combined, can be prepared with high saturation and magnetic intensity (Ms), high remanent magnetism (Br), low-coercivity (Hc), low microwave dielectric loss tanδεThe spinelle complex ferrite material of the features such as with low ferromagnetic resonance line width Δ H.The composite has good microwave Electromagnetic performance, the loss reduction for microwave device is significant.
For high band microwave ferrite product, U.S. Trans Teck (EMS), Pacific Ceramics, Europe The companies such as Doman and Thomson are constantly in first place in the world.Wherein, the product of U.S. Trans Teck (EMS) issues L1100 type LiZn ferrite performance indexs are：Saturation magnetization Ms=382 ± 5%kA/m, remanent magnetism Br=370mT, it is ferromagnetic common Line width of shaking Δ H (X-band)=19.9 ± 20%kA/m, dielectric loss tan δε(X-band)<5×10-4, permittivity ε ' (X- Band)=15.3, Curie temperature Tc=400 DEG C；L1101 type LiZn ferrite performance indexs are：Saturation magnetization Ms=382 ± 5%kA/m, remanent magnetism Br=360mT, ferromagnetic resonance line width Δ H (X-band)=19.9 ± 20%kA/m, dielectric loss tan δε (X-band)<5×10-4, permittivity ε ' (X-band)=15.3, Curie temperature Tc=400 DEG C.U.S. Trans Teck (EMS) two properties of product are more close more than, but ferromagnetic resonance line width is too high, are unfavorable for the insertion of the microwave devices such as phase shifter The reduction of loss；Meanwhile, two product does not announce density parameter.The XL45A types LiZn that southwestern applied magnetics research institute announces Ferrite saturation magnetization Ms=358 ± 5%kA/m, ferromagnetic resonance line width Δ H (X-band)=25.4 ± 25%kA/m, are situated between Electrical loss tan δε(X-band)<5×10-4, permittivity ε ' (X-band)=15.0, Curie temperature Tc>500 DEG C, density db= 4.75g/cm3, in addition to ferromagnetic resonance line width is too high, do not provide material coercivity HcWith remanent magnetism BrParameter.In addition, the U.S. Trans Teck (EMS) announce TT86-6000 type Ni based ferrite performance indications be：Saturation magnetization Ms=398 ± 10%kA/m, remanent magnetism Br=380mT, coercivity Hc=119A/m, ferromagnetic resonance line width Δ H (X-band)<15.9 ± 20%kA/ M, dielectric loss tan δε(X-band)<2.0×10-4, permittivity ε ' (X-band)=12.5 ± 5%, Curie temperature Tc= 363 DEG C, the product density parameter is not provided；Meanwhile, the XN48A type NiZn ferrites that Mianyang Westmag Technology Co., Ltd. announces Can index be：Saturation magnetization Ms=382 ± 5%kA/m, ferromagnetic resonance line width Δ H (X-band)<11.9kA/m, dielectric is damaged Consume tan δε(X-band)<5×10-4, permittivity ε ' (X-band)=13.0, Curie temperature Tc>430 DEG C, density db= 5.24g/cm3, product coercivity H is not providedcWith remanent magnetism BrParameter.To adapt to device miniaturization, light-weighted requirement, phase shift Equipment material should have low-coercivity, to reduce the volume and weight of drive circuit.It is public in disclosed patent CN102167575A Cloth a kind of Ka band phase shifters LiZn Ferrite Materials and preparation method, using iron deficiency main formula to reduce micro-wave dielectric damage Consumption, and by adding low melting point additive B i2O3Suppress Li volatilizations to reduce sintering temperature, performance indications are：Saturation magnetization Ms=382 ± 5%kA/m, remanent magnetism Br>360mT, coercivity Hc<120A/m, ferromagnetic resonance line width Δ H (X-band)=12.0kA/ M, permittivity ε ' (X-band)=15.0, dielectric loss tan δε(X-band)<6×10-4, Curie temperature Tc>460 DEG C, density db>4.90g/m3.Patent CN101552072A discloses a kind of low-loss LiZn ferrite material for phase shifter and preparation method, It, which replaces and lacked Fe formulas by using Mn, reduces the microwave dielectric loss of material, and its main formula is：Fe2O3：64-71mol%, ZnO：15-22mol%, Mn3O4：0.8-1.5mol%, Li2CO3：9.9-12mol%, auxiliary element includes Bi2O3、BST、 Nb2O5, 2-6 hours are incubated at 920-1000 DEG C.The Ferrite Material performance of acquisition is：Saturation magnetization Ms=382 ± 5%kA/m, remanent magnetism Br>360mT, coercivity Hc<120A/m, ferromagnetic resonance line width Δ H (X-band)=15.0~20.0kA/m, Permittivity ε ' (X-band)=15.0, dielectric loss tan δε(X-band)<5×10-4, Curie temperature Tc>400 DEG C, density db> 4.80g/cm3。
The content of the invention
Present invention is generally directed to prior art design high band microwave device microwave ferrite present in low-loss, Three key parameters of high-curie temperature and low-coercivity are difficult to while the technical barrier met has low-loss, height concurrently there is provided one kind The Li systems of Curie temperature and low-coercivity characteristic and Ni system spinel complex ferrite materials and preparation method thereof.
The present invention core concept be：It is directed to low microwave dielectric loss requirement, Li systems adopt with Ni systems single-phase ferrites With appropriate iron deficiency formula, then its conductive mechanism is p-type, and material has high resistivity, advantageously reduces microwave device under high frequency Insertion loss；Ferromagnetic resonance line width Δ H is main by magnetocrystalline anisotropy broadening Δ Ha, stomata broadening Δ HpWith intrinsic monocrystalline line width ΔHiComposition, using magnetocrystalline anisotropy compensation mechanism, has by the Ni based ferrites compensation with low magnetocrystalline anisotropy The ferromagnetic resonance line width portion of the Li based ferrites of high magnetocrystalline anisotropy, effectively reduction complex ferrite as caused by anisotropy Divide Δ Ha；Meanwhile, using molecular field superexchange interaction compensation mechanism, by being compensated with the Li based ferrites compared with high-curie temperature Ni based ferrites with relatively low Curie temperature, effectively improve the ferritic Curie temperature of composite microwave；On additive, Using Bi2O3、V2O5、CaO、Mn3O4、SiO2、Co2O3, the additive such as High-activity nano-grade BST the brilliant double property effects of fluxing and resistance, The interactive control of compound additive is realized, on the one hand by improving sintered density, the porosity is reduced, effectively reduction is by stomata The caused ferritic ferromagnetic resonance line width part Δ H of composite microwavep；On the other hand, Co is passed through2O3To composite microwave ferrite Magnetocrystalline anisotropy compensating action, reduction composite microwave ferritic anisotropy line width Δ Ha；3rd, by with Gao Jie The additive of electric constant is enriched in grain boundaries and high valence ion to Fe2+The inhibitory action of formation, can effectively improve resistivity of material, Reduce the ferritic microwave dielectric loss of composite microwave.I.e.：Pass through the control to magnetocrystalline anisotropy and molecular field superexchange interaction System, realizes composite microwave Ferrite Material less anisotropy line width Δ HaAnd high-curie temperature；Pass through drawing for low melting point additive Enter, control the crystal particle crystal boundary characteristic of material, effectively facilitate the ferritic densification growth of composite microwave so that composite microwave iron oxygen Body has low-coercivity HcWith low stomata line width Δ Hp；Pass through main formula iron deficiency and high-k high-activity nano flour additive agent Introducing, realize Li systems and the ferritic low microwave dielectric loss of Ni systems composite microwave.
The technical problems to be solved by the invention are to provide a kind of Li systems and Ni system spinel complex ferrite materials and system Preparation Method, its material has saturation magnetization Ms：400 ± 20%kA/m, low-coercivity Hc：<90A/m, high-curie temperature Tc：> 330 DEG C, low ferromagnetic resonance line width Δ H (X-band)：<9.0kA/m and low-dielectric loss tan δε(X-band)：2.5×10-4 Characteristics such as (± 20%).
The technical scheme that the present invention solves the technical problem use is that spinelle complex ferrite material, its feature exists In component includes：
Li owner expects that formula uses 67.0~74.0mol%Fe2O3, 16.0~24.0mol%ZnO, 2.0~ 17.0mol%Li2CO3；
Ni owner expects that formula uses 47.0~48.5mol%Fe2O3, 18.0~19.5mol%ZnO, 25.0~ 26.5mol%NiO, 5.5~10.0mol%CuO；
In mass ratio, Li owner expects:Ni owner's material=1:99~99:1；
Also include additive, by weight percentage, calculated with oxide：0.10~1.00wt%Bi2O3, 0.01~ 0.10wt%V2O5, 0.60~0.70wt%BST, 0.001~0.05wt%CaO.
The present invention also provides a kind of spinelle complex ferrite material preparation method, comprises the following steps：
1st, it is formulated
Li owner's formula uses 67.0~74.0mol%Fe2O3, 16.0~24.0mol%ZnO, 2.0~17.0mol% Li2CO3；
Ni owner's formula uses 47.0~48.5mol%Fe2O3, 18.0~19.5mol%ZnO, 25.0~26.5mol% NiO, 5.5~10.0mol%CuO；
2nd, a ball milling
Above Li systems and Ni systems powder are well mixed in ball mill respectively, 2~4 hours time；
3rd, pre-burning
Step 2 gained ball milling material is dried, and pre-burning 2~3 hours in 800~1000 DEG C of stoves respectively；
4th, adulterate
Step 3 gained Li systems and Ni systems powder are expected with Li owner:Ni owner's material=1:99~99:1 mass percent Mixing, adds following additive by weight：0.10~1.00wt%Bi2O3, 0.01~0.10wt%V2O5, 0.60~ 0.70wt%BST, 0.001~0.05wt%CaO.
5th, secondary ball milling
By the powder obtained in step 4 in ball mill ball milling 4~8 hours；
6th, it is molded
By step 5 gained powder by weight 8~20wt% organic bonds are added, mix, will on press after granulation Granular powder is pressed into blank；
7th, sinter
Step 6 gained blank is placed in sintering furnace and sintered, 4~6 hours are incubated at 1000~1200 DEG C；
8th, test
Step 7 gained sample is subjected to electromagnetic performance test.
Material specific saturation magnetization ζsTested with U.S. Quantum Design SQUID VSM；
Residual magnetic flux density Br, coercivity HcTested with Japanese IWATSU SY-8232B-H analyzers；
Density dbTested with drainage, saturation magnetization M is calculated according to density and specific saturation magnetizations=ζsdb；
Ferromagnetic resonance line width Δ H, permittivity ε ' and the dielectric loss tan of sample are measured under 9.3GHz by IEC standard δε；
Curie temperature T is carried out using Netzsch STA409PC thermal gravimetric analyzerscMeasurement；
The Li systems of the present invention and the technology of preparing of Ni system spinel complex ferrite materials, its technical indicator are as follows：
Saturation magnetization Ms：400 ± 20%kA/m；
Residual magnetic flux density Br：≥375mT(25℃)；
Coercivity Hc：<90A/m；
Curie temperature Tc：>330℃；
Ferromagnetic resonance line width Δ H：<9.0kA/m(X-band)；
Permittivity ε '：12~14 (X-band)；
Dielectric loss tan δε：2.5×10-4(± 20%) (X-band)；
Density db：>4.90g/cm3。
The ratio of additive herein is quality with major ingredient and all additives and is calculating benchmark, such as 0.60~ 0.70wt%BST, refers to the quality in all major ingredients and all additives with, BST proportions are 0.60~0.70wt%.
Herein, the scope represented by number range symbol "~" include end value, such as 67.0~74.0, its scope includes 67.0 and 74.0 two values.
Li systems proposed by the present invention can be the neck such as radio frequency and microwave electromagnetic device with Ni system spinel complex ferrites material Domain solves the key technical problem in terms of following three：First, low-loss can effectively reduce radio frequency and microwave device loss, to penetrating The raising of frequency and microwave device working band has positive effect；Second, high-curie temperature can widen the operating temperature model of device Enclose, be remarkably improved the reliability of device work；Third, low-coercivity can reduce exciting current, contribute to device and system Miniaturization.
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Brief description of the drawings
Fig. 1 is preparation method process chart of the invention.
Fig. 2 is the stereoscan photograph of the spinelle complex ferrite material of embodiment 1.
Fig. 3 is the stereoscan photograph of the spinelle complex ferrite material of embodiment 2.
Fig. 4 is the stereoscan photograph of the spinelle complex ferrite material of embodiment 3.
Fig. 5 is the stereoscan photograph of the spinelle complex ferrite material of embodiment 4.
Fig. 6 is the stereoscan photograph of the spinelle complex ferrite material of embodiment 5.
Fig. 7 is the stereoscan photograph of the spinelle complex ferrite material of embodiment 6.
Embodiment
For having the skill of the composite microwave Ferrite Material of low-loss, high-curie temperature and low-coercivity both at home and abroad at present Art blank and demand, the invention provides the Li systems of low-loss, high-curie temperature and low-coercivity characteristic and Ni system spinels are multiple Close Ferrite Material and its technology of preparing.Its guiding theory is：Magnetocrystalline anisotropy compensation, strong superexchange interaction compensation, p-type are led Motor system and low temperature high density sintering.First, the Fe of preferred high-purity is passed through2O3、ZnO、CuO、Li2CO3And NiO is former material Material, in depth analyze superexchange interaction present in Li systems and the single-phase Ferrite Material of Ni systems, magnetized power, magnetize resistance and Conductive mechanism, especially in low microwave dielectric loss, Li systems use iron deficiency main formula with the single-phase ferrite of Ni systems, formulate most Excellent formula range；Secondly, in view of Li0.5Fe2.5O4And NiFe2O4Crystal anisotropy constant K1Respectively -8.5 × 10kJ·m-3With -6.7 × 10kJm-3, and Curie temperature is respectively 670 DEG C and 585 DEG C, can be had by the way that Li systems and Ni systems are compound The effect ground ferritic magnetocrystalline anisotropy line width Δ H of reduction composite microwavea, meanwhile, the Curie for improving spinelle complex ferrite Temperature；Again, variety classes additive interacting to Li systems and Ni system spinel complex ferrite material microstructures is analysed in depth Mechanism of action, have studied additive B i2O3、V2O5、CaO、Mn3O4、SiO2、Co2O3, High-activity nano-grade BST etc. is to compound iron oxygen Body material magnetocrystalline anisotropy constant, crystal boundary, the influence of grain properties, formulate optimal additive formulations；Finally, match somebody with somebody above-mentioned On the premise of side, additive and powder optimum preparation condition, with reference to the sintering process of high density even grained, prepare at low temperature There is Li systems and the Ni system spinel complex ferrite materials of low-loss, high-curie temperature and low-coercivity characteristic.
The spinelle complex ferrite material of the present invention, principal component is calculated with oxide molar percentage, additive component Calculated by principal component mass percent.Low-loss, high-curie temperature and the low-coercivity Li systems of the present invention and Ni system spinels are multiple Ferrite Material and preparation method thereof is closed, is comprised the following steps：
1st, it is formulated
Li owner's formula uses 67.0~74.0mol%Fe2O3, 16.0~24.0mol%ZnO, 2.0~17.0mol% Li2CO3；
Ni owner's formula uses 47.0~48.5mol%Fe2O3, 18.0~19.5mol%ZnO, 25.0~26.5mol% NiO, 5.5~10.0mol%CuO；
2nd, a ball milling
Above Li systems and Ni systems powder are well mixed in ball mill respectively, 2~4 hours time；
3rd, pre-burning
Step 2 gained ball milling material is dried, and pre-burning 2~3 hours in 800~1000 DEG C of stoves respectively；
4th, adulterate
Step 3 gained Li systems are mixed with Ni systems powder with different quality percentage, following additive is added by weight： 0.10~1.00wt%Bi2O3, 0.01~0.10wt%V2O5, 0.60~0.70wt%BST, 0.001~0.05wt%CaO
5th, secondary ball milling
By the powder obtained in step 4 in ball mill ball milling 4~8 hours；
6th, it is molded
By step 5 gained powder by weight 8~20wt% organic bonds are added, mix, will on press after granulation Granular powder is pressed into blank；
7th, sinter
Step 6 gained blank is placed in sintering furnace and sintered, 4~6 hours are incubated at 1000~1200 DEG C；
8th, test
Step 7 gained sample is subjected to electromagnetic performance test.
Material specific saturation magnetization ζsTested with U.S. Quantum Design SQUID VSM；
Residual magnetic flux density Br, coercivity HcTested with Japanese IWATSU SY-8232B-H analyzers；
Density dbTested with drainage, saturation magnetization M is calculated according to density and specific saturation magnetizations=ζsdb；
Ferromagnetic resonance line width Δ H, permittivity ε ' and the dielectric loss tan of sample are measured under 9.3GHz by IEC standard δε；
Curie temperature T is carried out using Netzsch STA409PC thermal gravimetric analyzerscMeasurement.
Specific embodiment：
Embodiment 1~6：Low-loss, high-curie temperature and low-coercivity Li systems and Ni system spinel complex ferrite materials And preparation method thereof, comprise the following steps：
Embodiment 1~6：
1st, it is formulated
Li owner's formula uses 72.0mol%Fe2O3, 23.0mol%ZnO, 5.0mol%Li2CO3；
Ni owner's formula uses 47.0mol%Fe2O3, 18.5mol%ZnO, 25.5mol%NiO, 9.0mol%CuO；
2nd, a ball milling
Li systems in step 1 and Ni systems powder are well mixed in ball mill respectively, the time is respectively 4 hours；
3rd, pre-burning
By the drying of step 2 gained ball milling material, and by Li systems and Ni systems powder, pre-burning 3 is small in 850 and 950 DEG C of stoves respectively When；
4th, adulterate
Step 3 gained Li systems are mixed with Ni systems powder with different quality percentage,
1~6Li of embodiment systems with Ni systems different quality percentage is compound see the table below：
Li systems are mixed into gained powder with different quality percentage with Ni systems powder and add following additive by weight： 0.40wt%Bi2O3, 0.06wt%V2O5, 0.60wt%BST, 0.002wt%CaO
5th, secondary ball milling
By the powder obtained in step 4 in ball mill ball milling 8 hours；
6th, it is molded
By step 5 gained powder by weight 20wt% organic bonds are added, mix, after granulation, by grain on press Shape powder pressing is into blank；
7th, sinter
Step 6 gained blank is placed in sintering furnace and sintered, 4 hours are incubated at 1000 DEG C.Prepared by process above Low-loss Li systems and Ni systems composite microwave Ferrite Material, its performance indications is as follows：
The test result of embodiment 1~6 is as follows：

Claims (4)

1. spinelle complex ferrite material, it is characterised in that component includes：
Li owner expects that formula uses 67.0~74.0mol%Fe2O3, 16.0~24.0mol%ZnO, 2.0~17.0mol% Li2CO3；
Ni owner expects that formula uses 47.0~48.5mol%Fe2O3, 18.0~19.5mol%ZnO, 25.0~26.5mol% NiO, 5.5~10.0mol%CuO；
In mass ratio, Li owner expects:Ni owner's material=1:99~99:1；
Also include additive, by weight percentage, calculated with oxide：0.10~1.00wt%Bi2O3, 0.01~0.10wt% V2O5, 0.60~0.70wt%BST, 0.001~0.05wt%CaO.
2. spinelle complex ferrite material as claimed in claim 1, it is characterised in that in mass ratio, Li owner's material:Ni systems Major ingredient=40:60~20:80；
3. the preparation method of spinelle complex ferrite material, it is characterised in that comprise the steps：
1) it is formulated
The formula of Li owner's material uses 67.0~74.0mol%Fe2O3, 16.0~24.0mol%ZnO, 2.0~17.0mol% Li2CO3；
The formula of Ni owner's material uses 47.0~48.5mol%Fe2O3, 18.0~19.5mol%ZnO, 25.0~26.5mol% NiO, 5.5~10.0mol%CuO；
2) ball milling
Above Li owner material and Ni owner's material are well mixed in ball mill respectively, 2~4 hours time；
3) pre-burning
Step 2 gained ball milling material is dried, and pre-burning 2~3 hours in 800~1000 DEG C of stoves respectively；
4) adulterate
Expect by Li owner：Ni owner's material=1:99~99:1 mass ratio, step 3 gained Li systems are mixed with Ni systems powders；So Add following additive by weight afterwards：0.10~1.00wt%Bi2O3, 0.01~0.10wt%V2O5, 0.60~0.70wt% BST, 0.001~0.05wt%CaO；
5) secondary ball milling
By the powder obtained in step 4 in ball mill ball milling 4~8 hours；
6) it is molded
By step 5 gained powder by weight 8~20wt% organic bonds are added, mix, will be granular on press after granulation Powder pressing is into blank；
7) sinter
Step 6 gained blank is placed in sintering furnace and sintered, 4~6 hours are incubated at 1000~1200 DEG C.
4. the preparation method of spinelle complex ferrite material as claimed in claim 3, it is characterised in that the step 4) In, Li owner's material：Ni owner's material=40:60~20:80.
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CN112239358A (en) * 2020-10-30 2021-01-19 成都子之源绿能科技有限公司 Microwave LiZnTiMn gyromagnetic ferrite material and preparation method thereof
CN113501708A (en) * 2021-06-23 2021-10-15 北京无线电测量研究所 Li-series spinel microwave ferrite material and preparation method thereof
CN113831119A (en) * 2021-09-30 2021-12-24 海宁辉恒磁业有限公司 Ultrahigh BsLow-loss manganese-zinc ferrite material and preparation method thereof
CN114956800A (en) * 2022-05-23 2022-08-30 西南应用磁学研究所(中国电子科技集团公司第九研究所) High-performance microwave polycrystalline ferrite material

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CN103172358A (en) * 2013-03-21 2013-06-26 电子科技大学 High BsHigh TcMnZn ferrite material and preparation method thereof
CN105236948A (en) * 2015-08-28 2016-01-13 电子科技大学 Preparation method of NiCuZn ferrite thick film material used for Ka wave band circulator

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Publication number Priority date Publication date Assignee Title
CN101552072A (en) * 2008-12-31 2009-10-07 电子科技大学 Low-loss LiZn ferrite material for phase shifter and preparation method thereof
CN103172358A (en) * 2013-03-21 2013-06-26 电子科技大学 High BsHigh TcMnZn ferrite material and preparation method thereof
CN105236948A (en) * 2015-08-28 2016-01-13 电子科技大学 Preparation method of NiCuZn ferrite thick film material used for Ka wave band circulator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112239358A (en) * 2020-10-30 2021-01-19 成都子之源绿能科技有限公司 Microwave LiZnTiMn gyromagnetic ferrite material and preparation method thereof
CN113501708A (en) * 2021-06-23 2021-10-15 北京无线电测量研究所 Li-series spinel microwave ferrite material and preparation method thereof
CN113831119A (en) * 2021-09-30 2021-12-24 海宁辉恒磁业有限公司 Ultrahigh BsLow-loss manganese-zinc ferrite material and preparation method thereof
CN114956800A (en) * 2022-05-23 2022-08-30 西南应用磁学研究所(中国电子科技集团公司第九研究所) High-performance microwave polycrystalline ferrite material

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