Synthesis of single crystal and microwave characteristics of magnetoplumbite type Ferrite

磁铅石型铁氧体单晶合成及微波特性

• 批准号: 13650728
• 负责人: KAGOTANI Toshio
• 金额: $ 2.18万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650728/
• 关键词: EMC; magnetic resonance; microwave; GHz band; complex permeability; electromagnetic absorber; single crystal; M-type ferrite; 電磁波吸収特性; 複素透磁率; 複素揖誘電率

Microwave radiation in the GHz band is increasingly being used in many various communication devices. Magnetic resonance phenomenon is known to appear near the frequency of 48 GHz in hexagonal M-type ferrite or W-type ferrite. It has been studied that the substitution by metal such as Ti, Mn and so on for Fe^<3+> in BaFe_12O_19 caused the reduction of resonance frequency from about 50 GHz to less than 10 GHz. And then this ferrite was found to be used as microwave absorber or countermeasure to EMI(elecromagnetic compatibility). Furthrermore, single crystal ferrite which show the inheret properties of substance, has been synthesized in order to improve the absorber characteristics of hexagonal ferrite. Crystal growth has been carried out in two stage electric furnace by Bridgmann method. The mixture of Fe_2O_3 and BaCO_3 powders in according to the ratio of chemical formulaBaFe_12O_19 were pelletized and calcinated at 1300℃, and crushed to the size of a few μm and prepared for crystal g … More rowth. Powder was put into Pt crucible and heated to more than1450℃(m.p.). The melt was hold at 1450℃ and lowered down at 2-10mm/h (cooling rate :5-10 ℃/h) to 1250℃. After the whole melt soidified, the crucble was fall down into water and quenched. The surface of ingot was portioned with grain boundarys, like as honeycomb structure. Each hexagonal facet has metalic luster. These were cut off by a diamond cutter and analized by X-ray Laue photuograph. Each pieces were single crystals indicating hexagonal symmetry. These samples were cut pararelly to c-axis or c-face in hexagonal ferrite, and prepared for magnetic measurement by vsm. The saturation magnetization Ms and the coercive force iHc are 80 emu/g and 4kOe, respectively. Also these samples were formed to toroidal shape and measured microwave characteristics (complex permeability μ and permittivity ε) in the range of 1-20 GHz by a network analyzer. The magnetic resonance appear near 48GHz in Ba ferrite. Therefore the resonance frequency need to be controlled to the frequency range of 1-20 GHz, which are used for practical application. And then, the substitution of metal such as Ti, Mn, Sn and Zr for Fe^<3+> in Ba ferrite was carried out, to investigate the effects on the microwave characteristics. At present, sigle crystal of metal substituted Ba ferrite is being tried and synthesized. Less

GHz频带中的微波辐射越来越多地用于许多各种通信设备中。已知在六角M型铁氧体或W型铁氧体中，在48 GHz的频率附近出现磁共振现象。研究了用Ti、Mn等金属取代BaFe_（12）O_（19）中的Fe^<3+>，使其谐振频率从50 GHz左右降低到10 GHz以下。然后发现这种铁氧体可用作微波吸收剂或EMI（电磁兼容性）对策。此外，为了改善六方晶系铁氧体的吸波性能，还合成了具有物质固有特性的单晶铁氧体。采用坩埚下降法在两段式电炉中进行晶体生长。将Fe_2O_3和BaCO_3按化学式BaFe_（12）O_（19）的比例混合后，在1300℃下造粒煅烧，粉碎至几μm大小，制备成晶体颗粒 ...更多信息 成长将粉末置于铂坩埚中并加热至1450 ℃以上（m. p.）。将熔体保持在1450℃，并以2- 10 mm/h（冷却速率：5-10 ℃/h）降至1250℃。当整个熔体凝固后，将十字架放入水中淬火。铸锭表面呈蜂窝状晶界分布。每个六角形的小平面都有金属光泽。用金刚石切割器切割，X射线劳厄照相机分析。每一片都是单晶体，表明六方对称。这些样品被平行于六角铁氧体的c轴或c面切割，并被制备用于vsm的磁性测量。饱和磁化强度Ms为80 emu/g，矫顽力iHc为4kOe。将这些样品制成环形，并通过网络分析仪测量1-20 GHz范围内的微波特性（复磁导率μ和介电常数ε）。Ba铁氧体在48 GHz附近出现磁共振。因此，谐振频率需要控制在1-20 GHz的频率范围内，这是用于实际应用。在此基础上，研究了Ti、Mn、Sn、Zr等金属元素对Ba铁氧体中Fe^<3+>的替代对微波性能的影响。目前，金属取代钡铁氧体单晶的合成正在尝试中。少

项目成果

籠谷登志夫, 藤原大輔, 杉本諭, 猪俣浩一郎, 本聞基文: "配向性M-型パリウムフェライトBal-xLaxZnxFe12-x-y(Me0.5Mn0.5)yO19における金属元素La、Mn、Zn置換による高マイクロ波吸収特性への効果"粉体および粉末冶金. 50(1). 58-62 (2003)

Toshio Kagotani、Daisuke Fujiwara、Satoshi Sugimoto、Koichiro Inomata、Motomon Honmon：“通过在定向 M 型钯铁氧体 Bal-xLaxZnxFe12-x-y(Me0.5Mn0.5) 中替代金属元素 La、Mn 和 Zn 来产生高微波能量yO19 对吸收性能的影响”粉末和粉末冶金 50(1) (2003)。

T.Kagotani, D.Fujiwara, H.Takabayashi, S.Sugimoto, K.Inomata and M.Homma: "Enhancement of Microwave Absorption Characteristics in Aligned M-type Barium Ferrite Bal-xLaxZnxFe_<12>-x-y(Me0.5Mn0.5)yO_<19>(x=0.0〜0.5,Me:,Sn,Zr,y=1.0〜3.0) by Metal Substitution"

T.Kagotani、D.Fujiwara、H.Takabayashi、S.Sugimoto、K.Inomata 和 M.Homma：“增强排列的 M 型钡铁氧体 Bal-xLaxZnxFe_<12>-x-y(Me0.5Mn0. 5)yO_<19>(x=0.0～0.5,Me:,Sn,Zr,y=1.0～3.0)金属置换"

T.Kagotani, D.Fujiwara, H.Takabayashi, S.Sugimoto, K.Inomata and M.Homma: "Effect of Substitution Composition on the Electromagnetic Absorption Properties in Aligned M-type Barinm Ferrite Bal-xLaxZnxFe_<12>-x-y(Me0.5Mn0.5)O_<19>"The Proceeding of The four

T.Kagotani、D.Fujiwara、H.Takabayashi、S.Sugimoto、K.Inomata 和 M.Homma：“取代成分对对齐 M 型 Barinm 铁氧体 Bal-xLaxZnxFe_<12>-x-y 电磁吸收性能的影响（

T.Kagotani, D.Fujiwara, H.Takabayashi, S.Sugimoto, K.Inomata, M.Homma: "Effect of Substitution Composition on the Electromagnetic Absorption Properties in Aligned M-type Barinm Ferrite Bal-xLaxZnxFe12-x-y(Me0.5Mn0.5)O19"The Proceeding of The fourth Pacifi

T.Kagotani、D.Fujiwara、H.Takabayashi、S.Sugimoto、K.Inomata、M.Homma：“替代成分对对齐 M 型 Barinm 铁氧体 Bal-xLaxZnxFe12-x-y(Me0.5Mn0) 电磁吸收性能的影响

籠谷登志夫, 藤原大輔, 杉本諭, 猪俣浩一郎, 本間基文: "配向性M-型バリウムフェライトBal_<-X>La_XZn_XFe_<12-X-y>(Me_<0.5>Mn_<0.5>)_yO_<19>における金属元素La、Mn、Zn置換による高マイクロ波吸収特性への効果"粉体および粉末冶金. 50・1. 58-62 (2003)

Toshio Kagotani、Daisuke Fujiwara、Satoshi Sugimoto、Koichiro Inomata、Motofumi Honma：“取向 M 型钡铁氧体中的金属 Bal_<-X>La_XZn_XFe_<12-X-y>(Me_<0.5>Mn_<0.5>)_yO_<19> 效应La、Mn、Zn元素的置换对高微波吸收特性的影响》《粉末冶金》50・1.58-62(2003)