Premium
Preparation and magnetic properties of Fe/Si/C/N ceramics derived from a polymeric precursor
Author(s) -
Li Junping,
Zhang Zhijie,
Zheng Zhimin,
Guo Li,
Xu Guiyun,
Xie Zemin
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26161
Subject(s) - ceramic , superparamagnetism , materials science , magnetization , transmission electron microscopy , amorphous solid , maghemite , hysteresis , pyrolysis , magnetic hysteresis , magnetometer , chemical engineering , analytical chemistry (journal) , magnetic field , composite material , nanoparticle , nanotechnology , crystallography , chemistry , organic chemistry , condensed matter physics , physics , quantum mechanics , engineering
Iron‐containing polysilazanes (PSZI) were prepared by the amine displacement reaction along with heat‐induced vinyl crosslinking reactions between Fe[N(SiMe 2 Vi) 2 ] 3 (Vi = CHCH 2 ) and polysilazane containing SiVi (PVSZ). The PSZIs were converted into magnetic ceramics by the pyrolysis in N 2 . The ceramics produced were investigated by X‐ray diffraction, transmission electron microscope and vibrating sample magnetometer at room temperature. It was indicated that α‐Fe is the only magnetic crystalline embedded in the amorphous Si/C/ N ‐based matrix from 500 to 900°C. Moreover, the sample prepared at 500°C showed few hysteresis at room temperature, consistent with the behavior of superparamagnetic particles, which was confirmed by the zero‐field‐cooled and field‐cooled magnetization measurement. Additionally, the results indicated that the magnetic properties of the ceramics could be tuned by controlling the content of iron and the pyrolysis temperature. This flexibility may be advantageous for some particular magnetic materials applications. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007