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With the progress of modern wireless communication technology, microwave communication devices are developing toward miniaturization and integration, and low-temperature co-firing ceramic/ferrite technology is the key to meet the above demands. In this paper, V2O5-Al2O3 (VA) sintering aid is used to realize low-temperature sintering (below melting point of silver that is 950 ℃) of Li-Zn microwave ferrite, which is suitable for radar phase shifter. In this work, firstly, Li-Zn ferrite pre-firing material is prepared by mechanochemical ball-milling method, and then VA composite is selected as sintering aid to prepare Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4 ferrite at low temperatures. The effects of adding amount of VA sintering aid and sintering temperature on crystal structure, microstructure and magnetic properties (saturation induction, coercivity, linewidth of ferromagnetic resonance, etc.) of the materials are also studied. The VA sintering aid can reduce the sintering temperature and maintain the spinel crystal structure of Li-Zn microwave ferrite, the diffraction peaks of V2O5 and Al2O3 involved in the sintering process are observed from none of the samples sintered at different temperatures, because the additive amount of VA sintering aid is very low compared with that of Li-Zn ferrite, so no corresponding impurity peaks are detected. The introduction of VA sintering aid can promote the grain growth, with the average grain size increasing from 0.92 μm to 9.74 μm. In the sintering process of Li-Zn ferrite, V2O5 in VA sintering aid will melt first to form liquid phase due to its low melting point, which promotes the growth of grains. At the same time, Al2O3 with higher melting point can inhibit the grain growth and make the grain uniform. It is worth noting that when excessive VA sintering aid is added, the grain size of ferrite will decrease instead, because too much VA sintering aid will form a large number of liquid phases around the grains, thus splitting the grains and hindering the further growth of the Li-Zn grains. Under the condition of optimal VA sintering aid addition (0.18%, weight percentage), the saturation induction of the sample increases from 144 mT to 281 mT; the rectangular ratio increases from 0.57 to 0.78; the coercivity decreases from 705 A/m to 208 A/m; the linewidth of ferromagnetic resonance decreases from 648 Oe to 247 Oe. In summary, VA sintering aid can effectively improve the properties of Li-Zn microwave ferrite, which has a positive significance in developing low- temperature co-firing ceramic/ferrite technology.
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Keywords:
- low temperature co-firing ceramic /
- phase shifter /
- Li-Zn microwave ferrite /
- V2O5-Al2O3 sintering aid
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图 1 Li-Zn铁氧体晶胞结构示意图
Figure 1. Schematic diagram of Li-Zn ferrite cell structure.
图 2 (a)不同样品的XRD图谱与尖晶石相标准图谱; (b) (311)与(440)峰的峰强比例值
Figure 2. (a) XRD patterns of different samples and standard patterns of spinel phase; (b) peak intensity ratios of (311) and (440) planes.
图 3 不同VA助烧剂添加量(质量分数)下(烧结温度为950 ℃) Li-Zn铁氧体样品截面的SEM图像 (a) 0; (b) 0.06%; (c) 0.18%; (d) 0.24%
Figure 3. SEM images of cross-section of Li-Zn ferrite samples with different amounts of VA sintering aids at a sintering temperature of 950 ℃: (a) 0; (b) 0.06%; (c) 0.18%; (d) 0.24%
图 4 不同VA助烧剂添加量(质量分数)下(烧结温度为950 ℃)样品的粒径尺寸分布 (a) 0; (b) 0.18 %
Figure 4. Particle size distribution of samples with different amounts of VA sintering aids at a sintering temperature of 950 ℃: (a) 0; (b) 0.18%.
图 5 VA助烧剂参与下的Li-Zn铁氧体的生长模型
Figure 5. Growth model of Li-Zn ferrite with VA sintering aid.
图 6 不同VA助烧剂添加量及不同温度下获得样品的各项性质 (a) 密度值; (b)饱和磁感应强度值; (c) 矩形比的值
Figure 6. Properties of the samples obtained under different amounts of VA sintering aids and different temperatures: (a) Density; (b) saturation induction; (c) rectangular ratio.
图 7 不同VA助烧剂添加量下样品的各项性质 (a) 矫顽力值; (b) 铁磁共振线宽值
Figure 7. Properties of the samples obtained under different amounts of VA sintering aids: (a) Coercivity; (b) ferromagnetic resonance line width.
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[1] Liao Y L, Xu F, Zhang D N, Zhou T C, Wang Q, Wang X Y, Jia L J, Li J, Su H, Zhong Z Y, Zhang H W 2015 J. Am. Ceram. Soc. 98 2556
Google Scholar
[2] 叶康平, 裴文瑾, 郗翔, 蒲殷, 伍瑞新 2020 69 017801
Google Scholar
Ye K P, Pei W J, Xi X, Pu Y, Wu R X 2020 Acta Phys. Sin. 69 017801
Google Scholar
[3] 冯涛, 党锐, 袁红兰, 罗建成 2020 磁性材料及器件 51 40
Google Scholar
Feng T, Dang R, Yuan H L, Luo J C 2020 J. Magn. Mater. Device 51 40
Google Scholar
[4] Li J, Lu B, Zhang Y, Wu J, Yang Y, Han X N, Wen D D, Liang Z, Zhang H W 2022 Chin. Phys. B 31 047502
Google Scholar
[5] Guo R D, Yu Z, Sun K, Wang W, Wu G H, Liu Y, Liu H, Jiang X N, Lan Z W 2020 J. Alloys Compd. 815 152504
Google Scholar
[6] Liao Y L, Wang Y Y, Chen Z W, Wang X Y, Li J, Guo R D, Liu C, Gan G W, Wang G, Li Y X, Zhang H W 2020 Ceram. Int. 46 487
Google Scholar
[7] Zhou T C, Zhang H W, Liu C, Jin L C, Xu F, Liao Y L, Jia N, Wang Y, Gan G W, Su H, Jia L J 2016 Ceram. Int. 42 16198
Google Scholar
[8] Wang X Y, Zhong Z Y, Chen Z W, Zhang H W, Li Y X, Liu C, Li J, Liao Y L 2020 Ceram. Int. 46 5719
Google Scholar
[9] 赵强, 杨青慧, 张怀武 2014 磁性材料及器件 45 50
Zhao Q, Yang Q H, Zhang H W 2014 J. Magn. Mater. Device 45 50
[10] Guo R D, Yu Z, Yang Y, Jiang X N, Sun K, Wu C J, Xu Z Y, Lan Z W 2014 J. Alloys Compd. 589 1
Google Scholar
[11] Wang X Y, Li Y X, Chen Z W, Zhang H W, Su H, Wang G, Liao Y L, Zhong Z Y 2019 J. Alloys Compd. 797 566
Google Scholar
[12] Samir Ullah M, Firoz Uddin M, Momin A A, Hakim M A 2021 Mater. Res. Express 8 016102
Google Scholar
[13] 邱华, 贾利军, 张素娜, 沈琦杭, 解飞, 张怀武 2019 磁性材料及器件 50 10
Google Scholar
Qiu H, Jia L J, Zhang S N, Shen Q H, Xie F, Zhang H W 2019 J. Magn. Mater. Device 50 10
Google Scholar
[14] Xu F, Shi X L, Liao Y L, Li J, Hu J 2020 Ceram. Int. 46 14669
Google Scholar
[15] Xie F, Liu H, Zhou S, Chen Y, Xu F, Bai M Y, Liu W G 2021 J. Alloys Compd. 862 158650
Google Scholar
[16] Xie F, Liu H, Zhao J J, Wen S, Bai M Y, Chen Y, Zhu Y C, Li Y, Liu W G 2021 J. Alloys Compd. 851 156806
Google Scholar
[17] Zhang D N, Wang X Y, Xu F, Li J, Zhou T C, Jia L J, Zhang H W, Liao Y L 2016 J. Alloys Compd. 654 140
Google Scholar
[18] Zhou T C, Zhang H W, Jia L J, Liao Y L, Zhong Z Y, Bai F M, Su H, Li J, Jin L C, Liu C 2015 J. Alloys Compd. 620 421
Google Scholar
[19] 张志东 2015 64 067503
Google Scholar
Zhang Z D 2015 Acta Phys. Sin. 64 067503
Google Scholar
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