Mechanochemical Preparation and Magnetic Properties of Fe3O4/ZnS Nanocomposite

被引:3
作者
Bujnakova, Z. [1 ]
Zorkovska, A. [1 ]
Kovac, J. [2 ]
机构
[1] SAS, Inst Geotech, Watsonova 45, Kosice 04001, Slovakia
[2] SAS, Inst Expt Phys, Watsonova 47, Kosice 04001, Slovakia
关键词
OPTICAL-PROPERTIES; NANOPARTICLES; TRANSITION; CELLS;
D O I
10.12693/APhysPolA.131.1120
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Powder nanocomposite of Fe3O4/ZnS was prepared by mechanochemical synthesis in a planetary ball mill. In this reaction natural magnetite mineral Fe3O4 was used, together with zinc acetate (CH3COO)(2)Zn center dot 2H(2)O and sodium sulfide Na2S center dot 9H(2)O, as precursors for the zinc sulfide ZnS. X-ray diffraction revealed that the sample is composed of small nanocrystalline particles, containing Fe3O4 and ZnS. The non-milled magnetite showed distinctive Verwey transition at around 120 K, this becomes suppressed after milling, as a consequence of structural disorder and presence of defects. Moreover, the reduction of saturation magnetization from 91 A m(2)/kg to 69.2 A m(2)/kg was observed, as a consequence of the milling process. The magnetization of the Fe3O4/ZnS nanocomposite was the lowest (34.5 A m(2)/kg), due to the milling and to the decreased weight fraction of the ferrimagnetic component. Nevertheless, the Fe3O4/ZnS sample demonstrates ferrimagnetic behavior as well, and its structure is less perturbed by milling, the Verwey transition, although less impressive, but is preserved.
引用
收藏
页码:1120 / 1122
页数:3
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