Mechanochemical Preparation and Magnetic Properties of Fe₃O₄/ZnS Nanocomposite

• Authors: Z. Bujňáková , A. Zorkovská , J. Kováč
• Languages of publication: EN

Abstracts

EN

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)₂Zn·2H₂O and sodium sulfide Na₂S·9H₂O, 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 m²/kg to 69.2 A m²/kg was observed, as a consequence of the milling process. The magnetization of the Fe₃O₄/ZnS nanocomposite was the lowest (34.5 A m²/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.

Keywords

EN

81.07.Bc; 81.20.Ev; 81.20.Wk

Discipline

• 81.20.Wk: Machining, milling
• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
• 81.07.Bc: Nanocrystalline materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 1120-1122

Dates

published

2017-04

Contributors

author

Z. Bujňáková

• Institute of Geotechnics, SAS, Watsonova 45, 040 01 Košice, Slovakia

author

A. Zorkovská

• Institute of Geotechnics, SAS, Watsonova 45, 040 01 Košice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.131.1120