Iron silicide nanoparticles in a SiC/C matrix from organometallic polymers: characterization and magnetic properties

Single-source-precursor synthesis of high temperature stable SiC/C/Fe nanocomposites from a processable hyperbranched polyferrocenylcarbosilane with high ceramic yield

“…Therefore, introduction of iron into Si-based PDCs is particularly preferred to include magnetic properties into the nal ceramics. [9][10][11][12][13] Three different ways can be envisaged to introduce iron into Si-based ceramics derived from molecular routes: (i) blending of the precursor with iron or iron oxide powders, [14][15][16] (ii) synthesis from metallopolymers, [10][11][12][13][17][18][19][20][21][22][23][24] and (iii) chemical modication of preceramic polymers using iron coordination compounds. [25][26][27][28] The rst route is limited by the size of the used metal (oxide) powders, while in the case of (ii) and (iii) a bottom-up approach on the atomic scale can be realized.…”

Polymer derived non-oxide ceramics modified with late transition metals

“…13,28 At higher temperatures iron clusters become larger in size giving ferromagnetic properties to the material. 15,27 A similar behaviour was observed in the ceramics containing alloy particles (Co/Fe), 30,33 metal silicide particles 16,21,35 and ceramic nanowires 40 or thin films containing iron. 34 The superparamagnetic and ferromagnetic properties of the materials can also be tuned in terms of the composition of metallopolymer precursor which in turn controls the nature of crystallites formed within the ceramics.…”

“…Very recently, thermolysis of poly(ferrocenylsilane) at 1000 1C or poly[{(dimethylsilyl)-ferrocenyl}diacetylene] at 850 1C was reported. 21 The formation of ferromagnetic Fe 3 Si nanoparticles, well distributed in a SiC/C matrix, was observed. The average size of the formed nanoparticles, their size distribution and their agglomeration behaviour depend strongly on the choice of polymer and the thermolysis conditions.…”

Synthesis, thin-film self-assembly, and pyrolysis of ruthenium-containing polyferrocenylsilane block copolymers

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Using metallopolymers as precursors to metal nanoparticles (NPs) is key to some of these applications and this may be achieved by either radiation or thermal treatment. 7,8,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Polyferrocenylsilanes (PFSs) are a wellknown class of metallopolymers, [33][34][35][36][37] which contain both Fe and Si in the main chain. Due to the presence of these elements, these materials possess useful characteristics, such as high resistance to oxygen plasma etching and redox activity.…”

“…Due to the presence of these elements, these materials possess useful characteristics, such as high resistance to oxygen plasma etching and redox activity. [38][39][40][41] In addition, PFSs have been used as precursors to Fe NPs with 35 -91 % ceramic yields, upon pyrolysis at 700 -1000 o C. 16,18,24,27,29,42 The NPs can be formed in an amorphous SiC/C/Si3N4 matrix, that acts as a barrier against agglomeration of the NPs, and hinders the formation of larger particles. 31 The pyrolysis temperature has a direct effect on the properties of the resulting NPs.…”