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(Ba_(1-x)Sr_x)_3Co_2Fe_(24)O_(41)材料的磁化处理与烧结特性
作者:贾利军 张怀武 陆清芳 石玉 刘颖力 钟智勇 
单位:电子科技大学微电子与固体电子学院 电子科技大学微电子与固体电子学院 电子科技大学微电子与固体电子学院 电子科技大学微电子与固体电子学院 电子科技大学微电子与固体电子学院 电子科技大学微电子与固体电子学院 成都 610054  成都 610054  成都 610054  成都 610054  成都 610054  成都 610054 
关键词:平面Z—型六角铁氧体  烧结特性  磁化处理  高频特性  显微结构 
分类号:TM277
出版年,卷(期):页码:2004,32(12):1505-1510
DOI:
摘要:
研究了采用固相法制备的(Ba_1-xSr+x)_3Co_2Fe_(24)O_(41)材料的烧结特性,讨论了预烧工艺、烧结温度、保温时间、降温方式等与材料显微结构及性能的关系。为了展宽频带,将永磁铁氧体制造中的磁化处理工艺“移植”到了该材料的制备中。结果显示:引入磁化处理措施有望改善材料性能。引入磁化处理后,优化的制备条件为配合料经1200℃预烧2h,升温速度为1℃/min样品在1220~1240℃烧结1~3 h,缓慢降温,所制得的样品共振频率高达1.8 GHz以上,截止频率在1 GHz附近,起始磁导率在5~13之间,介电常数ε低于30。
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The sintering characteristic of (Ba_(1-x)Sr_x)_3 Co_2 Fe_24O_(41) prepared by using ordinary ceramic process technique was studied. The dependence of pre-calcination techniques, sintering temperatures, holding time and cooling method on the structure and properties of materials was discussed. For expanding frequency, the magnetization treatment used in fabricating process of permanent ferromagnetic was introducing in the preparation technology for (Ba_(1-x)Sr_x)_3 Co_2 Fe_(24)O_(41) materials. Experimental results show that the magnetization treatment can improve the properties of materials. By using magnetization treatment (Ba_(1-x) Sr_x)_3 Co_2 Fe_(24)O_(41) materials with the resonance frequency of over 1.8 GHz, cut—off frequency is about 1 GHz, the install permeability μi is 5—13 ,and the dielectric constant ε of lower than 30 can be obtained at the optimized conditions of calcining of mixtures at 1 200℃ for 2 h with heating rate 1℃/rain, and sintering of sample at 1 220—1 240℃ for 1—3 h, lower cooling rate.
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参考文献:
[1] OSAMU Kimura, MASAFUMI Sakakura. Enhanced disper-sion frequency of hot-pressed Z-type magnetoplumbite ferrite with the composition 2Co·3Ba_(0.5)Sr_(0.5)·10.8Fe_2O_3 [J]. J Am Ceram Soc, 1995, 78(10): 2857—2860. [2] 冯则坤,李海华,何华辉.甚高频段应用的CoZ-型铁氧体材料研究[J].现代技术陶瓷,2002,2:3—5. FENG Zekun, LI Haihua, HE Huahai. Modern Technol Ceram(in Chinese), 2002, 2: 3—5. [3] 张洪国,周济,岳振星等.Z-型Ba_3Co_2Fe_(24)O_(41)软磁铁氧体性能的改善[J].压电与光学,1999,4:277—280. ZHANG Hongguo, ZHOU Ji, YUE Zhenxing, et al. Piezoelectr Acoustoopt (in Chinese), 1999, 4: 277—280. [4] ZHANG Hongguo, LI Longtu, ZHOU Ji, et al. Dielectric characteristics of Cu modified Z-type planar hexaferrite [J]. IEEE, IEEE International Symposium on Appl Ferroelectr, 2000, 2: 859—862. [5] ZHANG Hongguo, LI Longtu, WANG Yongli, et al. Lowtemperature sintering and electromagnetic properties of copper-modified Z-type hexaferrite [J]. J Am Ceram Soc, 2002, 85(5): 1180—1184. [6] 贾利军,张怀武,刘颖力,等.显微结构对Co_2Z型软磁铁氧体性能的影响[J].功能材料,2001(增刊):557—559. JIA Lijun, ZHANG Huaiwu, LIU Yingli, et al. J Funct Mater(in Chinese), 2001(supplement): 557—559. [7] LANGE F F, KELLER B J. Thermodynamics of densification——part Ⅱ gain growth in porous compacts and relation to densification [J]. J Am Ceram Soc, 1989, 75(5): 735—741. [8] ROBERT C O' Handley. Magnetic Materials Principle and Applications [M]. New York: John Wiley and Sons, 2000. p41.
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