Preparation and magnetic properties of Fe/Si/C/N ceramics derived from a polymeric precursor |
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| Authors: | Junping Li Zhijie Zhang Zhimin Zheng Li Guo Guiyun Xu Zemin Xie |
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| Affiliation: | 1. Laboratory of Advanced Polymer Materials, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China;2. Graduate University of Chinese Academy of Sciences, Beijing 100080, People's Republic of China |
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| Abstract: | Iron‐containing polysilazanes (PSZI) were prepared by the amine displacement reaction along with heat‐induced vinyl crosslinking reactions between Fe[N(SiMe2Vi)2]3 (Vi = ? CH?CH2) and polysilazane containing ? Si? Vi (PVSZ). The PSZIs were converted into magnetic ceramics by the pyrolysis in N2. 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 |
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| Keywords: | polysilazane precursor pyrolysis magnetic ceramics α ‐Fe |
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