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首页> 外文期刊>Physica, B. Condensed Matter >Study of the synthesis mechanism and magnetic properties of quasi-nano-sized Ba-Mg ferrite powders formed by self-propagating high-temperature synthesis
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Study of the synthesis mechanism and magnetic properties of quasi-nano-sized Ba-Mg ferrite powders formed by self-propagating high-temperature synthesis

机译：自蔓延高温合成制备准纳米Ba-Mg铁氧体粉末的合成机理和磁性能研究

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摘要

Quasi-nano-sized BaxMg1-xFe2O4 ferrite powders were prepared by using self-propagating high-temperature synthesis (SHS) combined with mechanical milling. The combustion temperature and the propagating rate of the SHS reaction were in the range of 930-1115 K and about 4.5-6.4 mm/s, respectively. X-ray and neutron-beam analysis showed that the SHS products were Ba0.38Mg0.62Fe2O4 and Ba0.42Mg0.58Fe2O4, respectively. The final ferrite powder size after mechanical milling was less than about 150 nm. The maximum magnetization (Ms), the residual magnetization (Mr) and the coercive force (iHc) of quasi-nano-sized BaxMg1-xFe2O4 significantly depend on the initial molar ratio of BaO to MgO of the reactant powder mixture and the oxygen partial pressure during the SHS reaction. The complex permeability decreased with the increase of the frequency, and its real value (mu(r)') reached the peak value at about 0.6 GHz. The SHS mechanism includes the competitive reduction reaction between barium and magnesium oxides, which influences the non-stoichiometric numbers and the magnetic properties of the ferrites.
机译：通过使用自蔓延高温合成（SHS）结合机械研磨来制备准纳米尺寸的BaxMg1-xFe2O4铁氧体粉末。 SHS反应的燃烧温度和传播速率分别在930-1115K和约4.5-6.4mm / s的范围内。 X射线和中子束分析表明，SHS产物分别为Ba0.38Mg0.62Fe2O4和Ba0.42Mg0.58Fe2O4。机械研磨后的最终铁素体粉末尺寸小于约150 nm。准纳米尺寸BaxMg1-xFe2O4的最大磁化强度（Ms），残余磁化强度（Mr）和矫顽力（iHc）很大程度上取决于反应物粉末混合物中BaO与MgO的初始摩尔比和氧分压在SHS反应中。复磁导率随频率的增加而降低，其实数值（mu（r）'）在约0.6 GHz时达到峰值。 SHS机理包括钡和氧化镁之间的竞争性还原反应，这会影响非化学计量数和铁氧体的磁性。

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