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Spinel Li-series ferrite material for x-band to millimeter wave-band lock phase shifter

A ferrite material, millimeter wave technology, applied in the field of microwave technology and magnetic materials, can solve the problem of low coercivity, high remanence ratio, low coercivity, high remanence ratio, high Curie temperature and high power withstand capacity and other issues to achieve the effect of low electromagnetic loss characteristics

Active Publication Date: 2019-03-08
SOUTHWEST INST OF APPLIED MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly aims at the technical problems of low coercive force, high remanence ratio, high Curie temperature and high power bearing capacity existing in ferrite materials used in x-band to millimeter-wave band microwave devices, and provides a Trace Cu 2+ 、Co 3+ The formula design of the substituted Li-based ferrite material has the characteristics of low coercive force, high remanence ratio and high Curie temperature under the condition of high spin wave linewidth

Method used

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  • Spinel Li-series ferrite material for x-band to millimeter wave-band lock phase shifter
  • Spinel Li-series ferrite material for x-band to millimeter wave-band lock phase shifter
  • Spinel Li-series ferrite material for x-band to millimeter wave-band lock phase shifter

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Experimental program
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Effect test

Embodiment 1

[0020] Spinel Li-based ferrite material for x-band to millimeter-wave band lock-in phase shifter, single-phase spinel structure, its composition chemical formula is,

[0021] Li 0.5(1-a+b-c-d-e) Zn a Mg e Ti b Cu c co d Bi n mn m Fe 0.5(5-a-3b-c-d-e)-m-n-δ o 4 ,

[0022] Where a=0.12, b=0.3, c=0.004, d=0.002, e=0.3, m=0.08, n=0.003, δ=0.02; calculate the required amount of each raw material according to the molecular formula. Use analytically pure Fe 2 o 3 , CuO, ZnO, Co 2 o 3 ,TiO 2 , MgO, MnCO 3 , Bi 2 o 3 , Li 2 CO 3 Raw materials, after treatment, calculate and weigh the corresponding weight according to the formula; once ball milled for 5 hours, mix evenly and then dry; pre-fire at 820°C, keep warm for 5 hours; then dry after the second ball mill for 5 hours, add 10% polyethylene Alcohol granulation, sintering at 980°C after molding, heat preservation for 5 hours; finally perform performance parameter test.

[0023] Apparent Density ρ of Materials Tes...

Embodiment 2

[0027] Spinel Li-based ferrite materials for lock-in phase shifters from x-band to millimeter-wave bands, single-phase spinel structure, and its composition chemical formula is:

[0028] Li 0.5(1-a+b-c-d-e) Zn a Mg e Ti b Cu c co d Bi n mn m Fe 0.5(5-a-3b-c-d-e)-m-n-δ o 4 ,

[0029] Where a=0.11, b=0.27, c=0.005, d=0.006, e=0.29, m=0.07, n=0.003, δ=0.04; calculate the required amount of each raw material according to the molecular formula. Use analytically pure Fe 2 o 3 , CuO, ZnO, Co 2 o 3 ,TiO 2 , MgO, MnCO 3 , Bi 2 o 3 , Li 2 CO 3 Raw materials, after treatment, calculate and weigh the corresponding weight according to the formula; once ball milled for 5 hours, mix evenly and then dry; pre-fire at 820°C, keep warm for 5 hours; then dry after the second ball mill for 5 hours, add 10% polyethylene Alcohol granulation, sintering at 980°C after molding, heat preservation for 5 hours; finally perform performance parameter test.

[0030] Apparent Density ρ of...

Embodiment 3

[0034] Spinel Li-based ferrite materials for lock-in phase shifters from x-band to millimeter-wave bands, single-phase spinel structure, and its composition chemical formula is:

[0035] Li 0.5(1-a+b-c-d-e) Zn a Mg e Ti b Cu c co d Bi n mn m Fe 0.5(5-a-3b-c-d-e)-m-n-δ o 4 ,

[0036] Where a=0.15, b=0.25, c=0.002, d=0.003, e=0.1, m=0.06, n=0.002, δ=0.06; calculate the required amount of each raw material according to the molecular formula. Use analytically pure Fe 2 o 3 , CuO, ZnO, TiO 2 , MnCO 3 ,Co 2 o 3 , Bi 2 o 3 , Li 2 CO 3 Raw materials, after treatment, calculate the corresponding weight according to the formula; once ball mill for 5 hours, mix evenly and then dry; pre-burn at 830°C, keep warm for 5 hours; then dry after the second ball mill for 5 hours, add 10% polyethylene Alcohol granulation, sintering at 990°C after molding, heat preservation for 5 hours; finally perform performance parameter test.

[0037] Measuring the Apparent Density ρ of Mat...

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Abstract

The invention discloses a spinel Li-series ferrite material for an x-band to millimeter wave-band lock phase shifter, which has a chemical formula: Li0.5(1-a+b-c-d-e)ZnaMgeTibCucCodBinMnmFe0.5(5-a-3b-c-d-e)-m-n-sigma O4, wherein a is more than or equal to 0 and less than or equal to 0.4; b is more than or equal to 0 and less than or equal to 0.5; c is more than or equal to 0.002 and less than or equal to 0.006; d is more than or equal to 0.002 and less than or equal to 0.008; e is more than or equal to 0 and less than or equal to 0.5; m is more than or equal to 0.03 and less than or equal to 0.08; n is more than or equal to 0.002 and less than or equal to 0.006; sigma is an iron lack amount, and is more than or equal to 0.02 and less than or equal to 0.08. According to the spinel Li-seriesferrite material, a small amount of Cu<2+> replaces Li<1+> and Fe<3+> of the Li0.5Fe2.5O4 system, thereby reducing the coercive force of the material and increasing the remanence ratio of the material; an appropriate amount of Co<3+> is added for improving the power bearing capacity of the material. When the residual magnetic induction intensity Br of the microwave ferrite material is between 148mT and 343 mT, the spin wave line width deltaHk is 400 to 800 A / m, the coercive force Hc is less than or equal to 80 A / m, the remanence ratio R is 0.89 to 0.96, and the Curie temperature Tc is 450 to500 DEG C; moreover, the material has low electromagnetic loss characteristics and can be applied to the x-band to millimeter wave-band high-power lock phase shifter.

Description

technical field [0001] The invention belongs to the field of microwave technology and magnetic materials, and is a spinel Li-based ferrite material with strong power bearing capacity, low coercive force, high remanence ratio, low loss and high Curie temperature characteristics, and satisfies the x-band Gyromagnetic materials used in high-power lock-in phase shifters and switches in millimeter-wave band microwave systems. Background technique [0002] The microwave ferrite material used in the microwave lock-in phase shifter not only requires the material to have a suitable residual magnetic induction intensity, small electrical loss and magnetic loss, and a high Curie temperature, but more importantly, the material should have a high residual magnetic ratio, low coercive force and corresponding high power handling capacity. [0003] Ferrite devices in the x-band to millimeter-wave bands generally use spinel ferrite materials. Spinel ferrite materials are divided into two c...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622H01P1/19
CPCC04B35/265C04B35/622C04B2235/3203C04B2235/3206C04B2235/3232C04B2235/3262C04B2235/3274C04B2235/3275C04B2235/3281C04B2235/3284C04B2235/3298H01P1/19
Inventor 袁红兰冯涛任仕晶
Owner SOUTHWEST INST OF APPLIED MAGNETICS
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