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SYNTHESIS AND MAGNETIC PROPERTIES OF HCP COBALT FINE PARTICLES ENCAPSULATED IN CARBON NANOCAPSULES

碳纳米胶囊包覆 HCP 钴细颗粒的合成及磁性能

基本信息

批准号：
08650010
负责人：
MASUDA Morio
金额：
$ 1.34万
依托单位：
MIE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Aiming at producing hcp-Co fine particles, particles of cobalt containing foreign metal elements (Pd, Os, Ru, Pt) were produced by arc evaporation. Crystal structures and magnetic properties of these Co alloy particles entrapped in carbon nanocapsules were investigated.1.Co-Pd alloySaturation magnetization M_s decreased gradually with the increase of Pd concentration, with the maximum M_s of about 140 emu/g at 5 at% Pd. Mean particle size was strongly dependent on Pd concentration, decreasing with the increase of Pd contnent ; the minimum size was about 4 nm at 50 at %Pd. Coercive force H_c showed large values when the particle size was small and the M_s was large ; the maximum of H_c was 550 Oe.2.Co-Os alloyM_s decreased steeply with the increase of Os concentration ; M_s was about 70 emu/g at 5 at% Os. Mean particle size was strongly dependent on Os concentration, decreasing with the increase of Os content ; the minimum size was about 8 nm. The maximum of H_c was 400 Oe.3.Co-Ru alloyM_s decreased steeply with the increase of Ru concentration ; M_s was about 70 emu/g at 5 at% Os. Mean particle size was strongly dependent on Os concentration, decreasing with the increase of Ru content ; the minimum size was about 6 nm. The maximum of H_c was 450 Oe.4.Co-Pt alloyM_s decreased with the increase of Pt concentration ; M_s was about 100 emu/g at 5 at% Pt. Mean particle size was strongly dependent on Pt concentration, decreasing with the increase of Pt content ; the minimum size was about 4 nm. The maximum of H_c was 450 Oe.All the alloy particles produced in the present study had the fcc structure instead of the hcp.

为生产HCP-Co超细颗粒，采用电弧蒸发法制备了含Pd、Os、Ru、Pt等杂质金属元素的钴颗粒。1.Co-Pd合金的饱和磁化强度M_S随Pd浓度的增加而逐渐减小，在Pd含量为5at%时，M_S达到最大值140emu/g。平均粒径强烈依赖于Pd的浓度，随Pd含量的增加而减小，在Pd含量为50at%时，最小粒径约为4 nm。当颗粒尺寸较小且M_S较大时，样品的矫顽力H_c出现较大值，最大值为550 O。2.Co-Os合金M_S随Os含量的增加而急剧下降，在5 at%Os时，M_S约为70emu/g。平均粒径随Os含量的增加而减小，最小粒径约为8 nm。Co-Ru合金M_S随Ru浓度的增加而急剧下降，在5at%Os时，M_S约为70emu/g。平均粒径强烈依赖于Os的浓度，随Ru含量的增加而减小，最小粒径约为6 nm。钴-铂合金M_S随铂浓度的增加而减小，当铂含量为5at%时，M_S约为100emu/g。平均粒径随铂含量的增加而减小，最小粒径约为4 nm。Hc的最大值为450O。本研究制备的合金颗粒均为面心立方结构，而不是hcp结构。