...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >Magnetoceramics from the Bulk Pyrolysis of Polysilazane Cross-Linked by Polyferrocenylcarbosilanes with Hyperbranched Topology
【24h】

Magnetoceramics from the Bulk Pyrolysis of Polysilazane Cross-Linked by Polyferrocenylcarbosilanes with Hyperbranched Topology

机译：聚二氮杂碳硅烷与超支化拓扑交联的聚硅氮烷本体热解的磁陶瓷

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this contribution, we report a novel strategy for the synthesis of nanocrystal-containing magnetoceramics with an ultralow hysteresis loss by the pyrolysis of commercial polysilazane cross-linked with a functional metallopolymer possessing hyperbranched topology. The usage of hyperbranched polyferrocenylcarbosilane offers either enhanced ceramic yield or magnetic functionality of pyrolyzed ceramics. The ceramic yield was enhanced accompanied by a decreased evolution of hydrocarbons and NH3 because of the cross-linking of precursors and the hyperbranched cross-linker. The nucleation of Fe5Si3 from the reaction of iron atoms with Si— C—N amorphous phase promoted the formation of α-Si3N4 and SiC crystals. After annealing at 1300 °C, stable Fe3Si crystals were generated from the transformation of the metastable Fe5Si3 phase. The nanocrystal-containing ceramics showed good ferromagnetism with an ultralow (close to 0) hysteresis loss. This method is convenient for the generation of tunable functional ceramics using a commercial polymeric precursor cross-linked by a metallopolymer with a designed topology.
机译：在这项贡献中，我们报告了一种新的策略，用于通过与具有超支化拓扑结构的功能性金属聚合物交联的商业化聚硅氮烷的热解，合成具有超低磁滞损耗的纳米晶体磁陶瓷。超支化聚二茂铁基碳硅烷的使用可提高陶瓷的收率或热解陶瓷的磁性。由于前体和超支化交联剂的交联，提高了陶瓷产量，同时减少了碳氢化合物和NH3的释放。铁原子与Si-C-N非晶相反应产生的Fe5Si3成核促进了α-Si3N4和SiC晶体的形成。在1300°C退火后，亚稳Fe5Si3相的转变产生了稳定的Fe3Si晶体。含纳米晶体的陶瓷表现出良好的铁磁性，并具有超低（接近0）的磁滞损耗。该方法便于使用通过具有设计拓扑结构的金属聚合物交联的商业聚合物前体来生成可调功能陶瓷。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号