Study on Electronic Ceramic Materials Synthesized by Sol-Gel Method

溶胶-凝胶法合成电子陶瓷材料的研究

• 批准号: 63460118
• 负责人: FUJII Toshitaka
• 金额: $ 4.22万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460118/
• 关键词: Sol-gel method; mist-pyrolysis; ferromagnetic iron oxides; ceramic fine particles; magnetic thin films; amorphous films; magneto-optical media; Mossbauer spectroscopy; 電子機能セラミックス; 磁性酸化物; 磁気光学素子; 磁場中配向

1. Preparation of iron-based-oxide powders by sol-gel method using nitrates of constituent metal ions dissolved in ethylene glycol.(1) Maghemite (gamma-Fe_2O_3) powders are synthesized at temperatures below 300 ^ﾟC.(2) Addition of boron, phosphor or sodium in maghemite is effective for improvement in thermal stability as well as magnetic properties of maghemite. Ultrafine maghemite particles with the grain diameter less than 10nm retaining large magnetic moment. are obtained by the addition of boron at the borronnocentration B/(Fe+B)=0.2.(3) Crystallographic single phase yttrium iron garnet (YIG) and bismuth substituted YIG powders are synthesized by gel processing and mist-pyrolysis. The amount of bismuth substitution is increased by citrate gel processing.2. Preparation of iron-based-oxide thin films by gel-coating on flat substrates.(1) Transparent films with a considerably large magnetization of 4piM_2 =3.1kG were obtained for the Fe-B-O system with B/(Fe +B)=0.2.(2) Polycrystallin … More e YIG and Bi-substituted YIG films were prepared by spin-coating the gel on glass substrates. Perpendicularly magnetized films were obtained by substituting partly aluminum for iron. Magneto-optical Faraday rotation is enhanced in multicoated films by presumably multireflection of interfaces formed by the gel-coating.(3) Single crystal YIG and Bi-substituted YIG films were grown by gel-coating on single crystal (GdCa)_3(GaMgZn)_5O_<12> substrates at a temperature of 580 ^ﾟC. It is considered that crystal growth proceeds from low temperature liquid phase epitaxy. The amount of bismuth substitution is greatly increased up to 2.5 in the formula unit.(4) Amorphous ferromagnetic oxide films with the Bi_2O_3-Fe_2O_3-PbTiO_3 system were prepared by gel-coating on glass plates, since this system films prepared by rf-reactive sputtering are found to exhibit ferromagnetism and ferroelectricity simultaneously well above room temperature. The magnetic properties of gel-coated films resemble those of sputtered films. Investigation is now progressing.3. Development of magneto-optical (MO-) materials composed of fine ferromagnetic particles. MO-media with discrete structure utilizing fine ferromagnetic particles dispersed in a liquid were investigated. We tentatively used magnetic inks of Ba-ferrite, magnetic fluids of magnetite and cobalt suspensions for magnetic particles, and polyvinyl alcohol and styrene monomer for resins. Transparent materials which exhibit magnetic as well as optical uniaxial anisotropies can be prepared by applying a magnetic field during solidification of the resin. MO-properties of these materials are now in progress. Less

1. 利用溶解在乙二醇中的组成金属离子的硝酸盐，通过溶胶-凝胶法制备铁基氧化物粉末。(1)在低于300^ﾟC的温度下合成磁赤铁矿(gamma-Fe_2O_3)粉末。(2)在磁赤铁矿中添加硼、磷或钠可有效提高热稳定性和磁性能 磁赤铁矿。粒径小于10nm的超细磁赤铁矿颗粒保留了较大的磁矩。在硼浓度B/(Fe+B)=0.2时添加硼得到。(3)通过凝胶处理和雾热解合成晶体单相钇铁石榴石(YIG)和铋取代YIG粉末。通过柠檬酸盐凝胶处理，增加了铋的取代量。 2．在平面基底上通过凝胶涂覆制备铁基氧化物薄膜。(1)在B/(Fe+B)=0.2的Fe-B-O体系中获得了具有相当大磁化强度4piM_2=3.1kG的透明薄膜。(2)将凝胶旋涂在玻璃基底上制备了多晶YIG和Bi取代YIG薄膜。通过用部分铝代替铁获得垂直磁化薄膜。多层镀膜薄膜中的磁光法拉第旋转可能是通过凝胶涂层形成的界面的多重反射而增强的。(3) 在单晶 (GdCa)_3(GaMgZn)_5O_<12> 衬底上，在 580 ^ﾟC 的温度下，通过凝胶涂层生长单晶 YIG 和 Bi 取代的 YIG 薄膜。认为晶体生长是由低温液相外延进行的。铋的取代量大大增加，达到分子式单元中的2.5。(4)通过凝胶涂覆在玻璃板上制备了Bi_2O_3-Fe_2O_3-PbTiO_3体系的非晶铁磁氧化物薄膜，因为该体系通过射频反应溅射制备的薄膜在远高于室温的温度下同时表现出铁磁性和铁电性。凝胶涂层薄膜的磁性与溅射薄膜相似。调查正在进行中。3。开发由细铁磁颗粒组成的磁光（MO-）材料。研究了利用分散在液体中的细铁磁颗粒的离散结构的 MO 介质。我们尝试使用Ba-铁氧体磁性墨水、磁铁矿磁性流体和钴悬浮液作为磁性颗粒、以及聚乙烯醇和苯乙烯单体作为树脂。表现出磁性和光学单轴各向异性的透明材料可以通过在树脂固化过程中施加磁场来制备。这些材料的 MO 特性目前正在进行中。较少的

项目成果

N.Takahashi,N.Kakuda,A.Ueno,K.Yamaguchi,T.Fujii: "Characterization of Iron Oxide Thin Films Preoared by SolーGel Method" Journal of Materials Sciense. 26. 497-504 (1991)

N. Takahashi、N. Kakuda、A. Ueno、K. Yamaguchi、T. Fujii：“溶胶-凝胶法制备的氧化铁薄膜的表征”材料科学杂志 26. 497-504 (1991)。

N.Takahashi: "Characterization of Maghemite Thin Films Prepared by Spin Coating a Gel Solution" Japan.J.Appl.Phys.Part2. 28. 244-247 (1989)

N.Takahashi：“通过旋涂凝胶溶液制备的磁赤铁矿薄膜的表征”Japan.J.Appl.Phys.Part2。

K.Yamaguchi: "Magnetic Anisotropy by Ferromagnetic Particle Alignment in a Magnetic Field" J.Appl.Phys.63. (1990)

K.Yamaguchi：“磁场中铁磁粒子排列的磁各向异性”J.Appl.Phys.63。

Naoyuki Takahashi, Noriyoshi Kakuda, Akifumi Ueno, Kazuhiro Yamaguchi and Toshitaka Fujii :"Characterization of Maghemite Thin Films Prepared by Spin-Coating a Gel Solution." Jpn. J. Appl. Phys.,. Vol. 28, No. 2,. 244-247 (1989)

Naoyuki Takahashi、Noriyoshi Kakuda、Akifumi Ueno、Kazuhiro Yamaguchi 和 Toshitaka Fujii：“通过旋涂凝胶溶液制备的磁赤铁矿薄膜的表征。”

Kazuhiro Yamaguchi, Koji Matsumoto and Toshitaka Fujii :"Magnetic anisotropy by ferromagnetic particles alignment in a magnetic field." J. Appl. Phys.,. Vol. 67, No. 9, PartII A,. 4493-4495 (1990)

Kazuhiro Yamaguchi、Koji Matsumoto 和 Toshitaka Fujii：“磁场中铁磁粒子排列产生的磁各向异性。”