Low TC Fe-Cr-Nb-B glassy submicron powders for hyperthermia applications

被引：23
作者：
Chiriac, H. [1 ]
Lupu, N. [1 ]
Lostun, M. [1 ]
Ababei, G. [1 ]
Grigoras, M. [1 ]
Danceanu, C. [1 ]
机构：
[1] Natl Inst Res & Dev Tech Phys, Iasi, Romania
来源：
JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 17期
关键词：
MAGNETIC-PROPERTIES; ALLOYS; CRYSTALLIZATION;
D O I：
10.1063/1.4866840
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Fe79.7-xNb0.3CrxB20 (x 11.5-13.5 at. %) submicron powders with glassy structure and sizes between a few tens of nm and 1 mu m have been prepared by high-energy ball milling from glassy melt-spun ribbons (MSRs) precursors. The glassy structure existing in the MSRs, and consisting of Fe-Cr clusters embedded within the (Fe, Nb)(3)B residual amorphous matrix, is preserved by milling the annealed MSRs in oleic acid and n-heptane. The glassy structure of the submicron powders confers the specific magnetic properties and allows tuning the Curie temperatures in the range of 15-50 degrees C. The precipitation of alpha-Fe in excess shifts the Curie temperature to 780 degrees C. The use of surfactants (oleic acid or heptane) avoids partially the agglomeration of powders, and their individual size goes down to 25-40 nm. The heating efficiency of the submicron powders in a. c. fields (H = 350mT and f = 153 kHz) evidences a working regime in the range of 33-45 degrees C, depending on Cr content, indicating the suitability of using the Fe-Cr-Nb-B powders for hyperthermia applications. (C) 2014 AIP Publishing LLC.
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页数：3
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