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The Mossbauer spectra of carbon nanotubes synthesize using ferrite catalyst

机译:铁氧体催化剂合成碳纳米管的莫斯鲍尔光谱

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The ferrite powder with honeycombed structure obtained by chemical combustion was used as catalyst to synthesize multi-walled carbon nanotubes by chemical vapor deposition. The magnetic components and characters of the the carbon nanotubes synthesized were investigated by X-ray diffraction (XRD), Mossbauer spectra and vibrating-sample magnetometer (VSM). The ferric components of the carbon nanotubes samples can be identified by Mossbauer spectra. The Mossbauer spectra of carbon nanotubes sample after purification contains two ferromagnetic sextet components corresponding to α -Fe species and Fe3C (cementite) species. While the Mossbauer spectra of the carbon nanotubes sample before purification contains three ferromagnetic sextet components corresponding to α -Fe species, Fe3C species and γ -Fe2O3. The saturation magnetization intensity Ms of carbon nanotubes sample after purification is decreased from 46.61 to 2.94 emu/g, but the coercive force increasd and reached 328Oe.
机译:通过化学燃烧获得的具有蜂窝状结构的铁氧体粉末被用作催化剂,以通过化学气相沉积法合成多壁碳纳米管。通过X射线衍射(XRD),莫斯鲍尔光谱和振动样品磁强计(VSM)研究了合成的碳纳米管的磁性和性质。碳纳米管样品的铁成分可以通过莫斯鲍尔光谱来识别。纯化后的碳纳米管样品的Mossbauer光谱包含对应于α-Fe物种和Fe3C(钙钛矿)物种的两个铁磁六重体组分。纯化前的碳纳米管样品的莫斯鲍尔光谱包含对应于α-Fe物种,Fe3C物种和γ-Fe2O3的三种铁磁六重体组分。纯化后的碳纳米管样品的饱和磁化强度Ms从46.61降至2.94 emu / g,但矫顽力增加,达到328Oe。

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