Nickel‐containing magnetoceramics from water vapor‐assisted pyrolysis of polysiloxane and nickel 2,4‐pentanedionate
Nickel‐containing magnetoceramics from water vapor‐assisted pyrolysis of polysiloxane and nickel 2,4‐pentanedionate
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DOI：
10.1111/jace.16738
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发表时间：
2019
影响因子：
3.9
通讯作者：
N. Yang;Min Gao;Jiefang Li;K. Lu
中科院分区：
文献类型：
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作者：
N. Yang;Min Gao;Jiefang Li;K. Lu
在本次演讲中，新型铁磁含镍硅碳氧化物（SiOC-Ni）是由基础聚硅氧烷（PSO）添加2,4-戊二酸镍成功制备而成。所得的SiOC-Ni纳米复合材料由原位形成的Ni纳米晶组成，少量的NiO均匀分散在非晶SiOC基体中，相应的纳米晶尺寸随着热解温度的升高而增大。热解过程中水蒸气的作用完全抑制了硅化镍 (NixSiy) 的形成。解释了基本的相演化过程和机制。在氩气气氛中，900°C热解的SiOC-Ni材料在高达1000°C的温度下保持稳定，重量损失小于6 wt%；它们在高达 ~900°C 的温度下表现出理想的电导率，最高电导率为 ~247 S/m。该系列 SiOC-Ni 材料还表现出令人兴奋的铁磁行为。它们具有软铁磁性的新半导体行为在磁传感器、变压器、执行器等方面呈现出广阔的应用潜力。参考文献：Yang N，Gao M，Li J，Lu K。水蒸气辅助热解聚硅氧烷和 2,4-戊二酸镍的含镍磁性陶瓷。 J Am Ceram Soc。 2020；103：145–157。 https://doi.org/10.1111/jace.16738 传记 _____________________________________________________________________________________
In this presentation, novel ferromagnetic Ni‐containing silicon oxycarbide (SiOC–Ni) was successfully fabricated from a base polysiloxane (PSO) with the addition of nickel 2,4‐pentanedionate. The resultant SiOC–Ni nanocomposite consists of in situ formed Ni nanocrystallites with a small amount of NiO uniformly dispersed in the amorphous SiOC matrix, and the corresponding nanocrystallite size increases with the increase of the pyrolysis temperature. The formation of nickel silicides (NixSiy) is completely suppressed by the effect of water vapor during the pyrolysis. The fundamental phase evolution process and mechanisms are explained. In an argon atmosphere, the SiOC–Ni materials pyrolyzed at 900°C are stable up to 1000°C with less than 6 wt% weight loss; they exhibit desirable electrical conductivity up to ~900°C with the highest electrical conductivity at ~247 S/m. This series of SiOC–Ni materials also demonstrates exciting ferromagnetic behaviors. Their new semiconducting behavior with soft ferromagnetism presents promising application potentials for magnetic sensors, transformers, actuators, etc. Reference: Yang N, Gao M, Li J, Lu K. Nickel‐containing magnetoceramics from water vapor‐assisted pyrolysis of polysiloxane and nickel 2,4‐pentanedionate. J Am Ceram Soc. 2020;103:145–157. https://doi.org/10.1111/jace.16738 Biography _____________________________________________________________________________________