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Magnetic properties of amorphous silicon carbonitride-based magnetoceramics synthesized using phenyl-substituted polysilazane as a precursor

Authors
Nam, H.-G.Huh, T.-H.Kim, M.Kim, J.Kwark, Y.-J.
Issue Date
Jun-2022
Publisher
Elsevier Ltd
Keywords
Ab initio; Magnetoceramic; Preceramic polymer; Silicon carbonitride
Citation
Journal of Alloys and Compounds, v.905
Journal Title
Journal of Alloys and Compounds
Volume
905
URI
http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42750
DOI
10.1016/j.jallcom.2022.164282
ISSN
0925-8388
Abstract
Magnetoceramics composed of pure α-Fe crystals grown in an amorphous silicon carbonitride matrix were prepared using phenyl-silsesquiazane (PSSQZ) and iron oxide (Fe3O4) as precursors. Magnetoceramics with commercial polysilazane were also synthesized for comparison. The PSSQZ induced growth of only α-Fe crystals in the magnetoceramics because of the high C content of the phenyl group of PSSQZ and the ability of the precursor to control the Si content; moreover, Fe silicide was not formed. In addition, the effect of the chemical composition of the precursor on the crystal phase growth was confirmed via ab initio thermodynamic calculations. The growth of pure α-Fe crystals resulted in improvements in magnetic saturation from 10.62 to 27.82 emu/g. This study showed that the microstructure of the magnetoceramics could be controlled according to precursor composition, resulting in an improved magnetic property. © 2022 Elsevier B.V.
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