|About this Abstract
||Materials Science & Technology 2019
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Nickel-SiOC Magnetoceramics from Water Assisted Pyrolysis of Polymers
||Kathy Lu, Ni Yang
|On-Site Speaker (Planned)
In this study, novel ferromagnetic Ni-containing silicon oxycarbide (SiOC-Ni) was successfully fabricated from a base polysiloxane (PSO) with addition of nickel 2,4-pentanedionate. The resultant SiOC-Ni composite consists of in-situ formed Ni crystallites with a small amount of NiO uniformly dispersed in the amorphous SiOC matrix. The formation of nickel silicides (NixSiy) is successfully suppressed. The Ni crystallite size increases with the pyrolysis temperature. The fundamental phase evolution process and mechanism are explained. In an argon atmosphere, the SiOC-Ni materials pyrolyzed at 900 °C are stable with less than 6 wt% weight loss up to 1000 °C; they also exhibit desirable electrical conductivity up to ~900 °C; the highest electrical conductivity is ~247 S/m. This series of SiOC-Ni materials demonstrates exciting ferromagnetic behaviors. The new semi-conducting behavior with soft ferromagnetism presents promising application potentials for magnetic sensors, transformers, actuators, etc.
||Definite: At-meeting proceedings