Microstructure and Magnetic Properties of SrOnFe_2O_3 (0.5<n<6.0)

SrOnFe_2O_3 (0.5<n<6.0)的显微组织和磁性能

• 批准号: 06452322
• 负责人: HOMMA Motofumi
• 金额: $ 4.99万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452322/
• 关键词: ferrite magnet; SrO6Fe_2O_3; 7SrO5Fe_2O_3; BaO6Fe_2O_3; BaOFe_2O_3; フェライト永久磁石; SrO・6Fe_2O_3; 六方晶SrO Fe_2O_3; 異方性磁界

The low Fe_2O_3 content compound close to a SrO6 Fe_2O_3 in Sr-ferrite permanent magnets was identified, and the microstructures and magnetic propertis of the Sr-ferrites between them were studied.1.The low Fe_2O_3 content compound close to a BaO6Fe_2O_3 (Ba-M) was a BaOFe_2O_3 (spinel) in BaO-Fe_2O_3system. However, it was a 7SrO5Fe_2O_3 compound (orthorhombic, "non-magnetic") in SrO-Fe_2O_3 system. The intensity of magnetization of Sr-ferrites decreased with decreasing Fe_2O_3 content.2.The coercivity of the Sr-ferrites increased with decreasing Fe_2O_3 content, and marked a peak near the 7SrO5Fe_2O_3.3.The Solubility of the 7SrO5Fe_2O_3 in the SrO6Fe_2O_3 (Sr-M) was about 2 mol Fe_2O_3% at an eutectic temperature (1470K), and decreased extremely with decreasing temperature, and disappeared below 1450K,while the solbulity of a BaOFe_2O_3 in a BaO6Fe_2O_3 was 2 mol Fe_2O_3% at room temperature.4.It is excepted that new type ferrite permanent magnets having wall pinning induced by precipitation of non magnetic 7SrO 5Fe_2O_3 and BaO Fe_2O_3 particles in main magnetic conpounds (Ba/Sr-M) will be developed in SrO-BaO-Fe_2O_3 ternary system.

鉴定了Sr铁氧体永磁体中接近SrO6 Fe_2O_3的低Fe_2O_3含量化合物，并研究了它们之间的Sr铁氧体的显微组织和磁性能。1.接近BaO6Fe_2O_3（Ba-M）的低Fe_2O_3含量化合物是BaOFe_2O_3（尖晶石）。 BaO-Fe_2O_3体系。然而，它是SrO-Fe_2O_3体系中的7SrO5Fe_2O_3化合物（斜方晶系，“非磁性”）。 Sr型铁氧体的磁化强度随着Fe_2O_3含量的降低而降低。2.Sr型铁氧体的矫顽力随着Fe_2O_3含量的降低而增加,并在7SrO5Fe_2O_3附近出现峰值。3.7SrO5Fe_2O_3在SrO6Fe_2O_3(Sr-M)中的溶解度约为2 mol Fe_2O_3% 在 共晶温度(1470K)下,随温度降低而急剧降低,在1450K以下消失,而室温下BaO6Fe_2O_3中BaOFe_2O_3的溶解度为2mol Fe_2O_3%。 4、例外的是非磁性7SrO·5Fe_2O_3和BaO析出引起的新型铁氧体永磁体壁钉扎现象。 主要磁性化合物(Ba/Sr-M)中的Fe_2O_3颗粒将在SrO-BaO-Fe_2O_3三元体系中发展。

项目成果

T.Kagotani: "Magnetic Properties of SrOnFe_2O_3 (0.5<n<6.0) and Phase Diagram in SrO-Fe_2O_3 System" IEEE Transaction on Magnetics. 31. 3674-3676 (1995)

T.Kagotani：“SrOnFe_2O_3 (0.5<n<6.0) 的磁性和 SrO-Fe_2O_3 系统中的相图”IEEE 磁学汇刊。

T. Kagotani: "Magnetic Properties of SrOnFe_2O_3(0.5<n<6.0) and Phase Diagram in Sro-Fe_2O_3 System" IEEE Transaction Magnetics. 31. 3674-3676 (1995)

T. Kagotani：“SrOnFe_2O_3(0.5<n<6.0) 的磁性和 Sro-Fe_2O_3 系统中的相图”IEEE Transaction Magnetics。

T.Kagotani: "Magnetic Properties of SrOnFe_2O_3(0.5<n<6.0)and Phase Diagram in SrO-Fe_2O_3 System" IEEE Transaction on Magnetics. 31. 3674-3676 (1995)

T.Kagotani：“SrOnFe_2O_3(0.5<n<6.0) 的磁性和 SrO-Fe_2O_3 系统中的相图”IEEE 磁学汇刊。

T.Kagotani et.al: "Magnetic Properties of SrO・nFe_2O_3(0.5<n<6.0)and Phase Diagram in SrO-Fe_2O_3 System" IEEE Transaction on Magnetics. 31. 3674-3676 (1995)

T. Kagotani 等人：“SrO·nFe_2O_3(0.5<n<6.0) 的磁性和 SrO-Fe_2O_3 系统中的相图”IEEE Transaction on Magnetics (1995)。