期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 7, 页码 1507-1514出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2tc00193d
关键词
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资金
- NSFC [21174112, 20874080]
- Basic Scientific Research Foundation of NPU [GBKY1020]
- Alexander von Humboldt Foundation
- Program for New Century Excellent Talents of Education Ministry of China [NCET-11-0817]
We report a novel strategy to synthesize nanostructured magnetoceramics via a direct bulk pyrolysis of hyperbranched polycarbosilanes without any assistance of nanoscaled templates. The hyperbranched polyferrocenyl(boro)carbosilanes (hb-PBCS) were synthesized via a convenient A(2)+B-3 strategy. After the pyrolysis of hb-PBCS under a nitrogen atmosphere at 1100 degrees C, iron silicide nanocrystal enriched ceramics with a grain size of 20-60 nm were formed. The regular architecture and quite higher ceramic yield of polymeric precursors are superior in retaining iron and silicon that give a possibility to aggregate into regular nanocrystals during the bulk pyrolysis in comparison to their linear counterparts. Furthermore, if the mixed precursor of hb-PBCS with regular architecture and a silylene-diacetylene polymer with high ceramic yield was employed, a hierarchical structure of uniform nanorods with diameters of 20-30 nm and aspect ratios of similar to 5 together with microspheres with diameters of 4-8 mm could be obtained under the same pyrolytic conditions. A vibrating sample magnetometer measurement demonstrated that the generated iron silicide nanocrystal enriched ceramics possessed weak ferromagnetism with an ultralow hysteresis loss.
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