Surfactant Removal Study for Nano-Scale SmCo5 Powder Prepared by High Energy Ball Milling

被引：8

作者：

Leontsev, S. ^{[1
,2
]}

Lucas, M. ^{[2
,3
]}

Shen, Y. ^{[1
,2
]}

Sheets, A. ^{[2
,4
]}

Horwath, J. ^{[2
]}

Karapetrova, E. ^{[5
]}

Crouse, C. ^{[2
,4
]}

机构：

[1] Univ Dayton, Res Inst, Dayton, OH 45469 USA

[2] Air Force Res Labs, Wright Patterson AFB, OH 45433 USA

[3] UTC, Dayton, OH 45433 USA

[4] UES Inc, Dayton, OH 45433 USA

[5] Argonne Natl Lab, Argonne, IL 60439 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2013年 / 49卷 / 07期

关键词：

High energy ball milling; magnetic properties; surfactant removal; SmCo5; MAGNETIC-PROPERTIES;

D O I：

10.1109/TMAG.2013.2250926

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In the present study, nano-flake SmCo5 powders with typical flake thickness of 300 nm were prepared by high energy ball milling using valeric acid as a surfactant. In order to remove the surfactant the as-milled powders were heat treated in argon and the effect of the annealing temperature on structural and magnetic properties of the resulting SmCo5 powder was investigated. Partial (58%) and nearly complete (96%) surfactant removal was observed by DSC after treatments at 200 degrees C and 400 degrees C, respectively, without oxide formation detectable by powder X-ray diffraction. Demagnetization measurements revealed suppression of the energy product (BH)(max) and dramatic decrease in coercivity (H-ei) after annealing. The results indicate that even a modest heat treatment of SmCo5 nano-powder severely degrades its magnetic properties. Either alternative methods of surfactant removal must be considered, or the surfactant must remain during further powder processing.

引用

页码：3341 / 3344

页数：4

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