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首页> 外文期刊>Journal of nanoscience and nanotechnology >Structure Analysis and Magnetic Properties of Nano-Sized Nb_xCu_yZn_(1-x-y)Fe_2O_4 Powders Formed by Self-Propagating High-Temperature Synthesis and Ultrasonic Agitation Method
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Structure Analysis and Magnetic Properties of Nano-Sized Nb_xCu_yZn_(1-x-y)Fe_2O_4 Powders Formed by Self-Propagating High-Temperature Synthesis and Ultrasonic Agitation Method

机译：自蔓延高温合成和超声搅拌法形成的Nb_xCu_yZn_（1-x-y）Fe_2O_4纳米粉体的结构分析和磁性

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摘要

Nano-sized Nb_(0.12)Cu_(0.45)Zn_(0.43)Fe_2O_4 ferrites with an average size of the agglomerated particles less than 300 nm were prepared by self-propagating high-temperature synthesis (SHS) followed by mechanical ball milling and classifying by ultrasonic floating agitation. The SHS reaction occurred in the powder mixture of iron and various oxides like NbO, CuO, ZnO, Fe_2O_3 at the oxygen pressure range of 0.1 to 1.0 MPa, which average combustion temperatures and combustion propagating rates were in the ranges of 1105 to 1343 K and 4.1 to 6.2 mm/s, respectively. The combustion temperature increased with the oxygen pressure. The combustion reaction did not occur above the uniaxial compacting pressure of 10.0 MPa, even though the oxygen pressure was 1.0 MPa. The neutron diffraction analysis revealed that the final product was Nb_(0.12)Cu_(0.45)Zn_(0.43)Fe_2O_4 with lattice parameters of 0.8472 nm. The maximum magnetization (M_s), residual magnetization (M_r), coercive force (iH_c), and susceptibility of the Nb_(0.12)Cu_(0.45)Zn_(0.43)Fe_2O_4 ferrites were 11.30 Wb/m~2 Kg, 1.47 Wb/m~2 Kg, 7321 A/m, and 0.02 m~3/kg, respectively. The addition of niobium to copper-zinc ferrites resulted in increasing M_s, M_r, and iM_c by about 49%, 68%, and 287%, respectively. The variation of the magnetic properties is related to the non-stoichiometric numbers and oxygen position of the niobium-copper-zinc ferrites.
机译：通过自蔓延高温合成（SHS），然后进行机械球磨和分级，制备了平均粒径小于300 nm的纳米Nb_（0.12）Cu_（0.45）Zn_（0.43）Fe_2O_4铁氧体。超声波浮动搅拌。 SHS反应发生在铁和各种氧化物（如NbO，CuO，ZnO，Fe_2O_3）的粉末混合物中，氧气压力范围为0.1至1.0 MPa，平均燃烧温度和燃烧传播速率在1105至1343 K和分别为4.1至6.2 mm / s。燃烧温度随着氧气压力的升高而升高。即使氧气压力为1.0 MPa，在单轴压缩压力10.0 MPa以上也不会发生燃烧反应。中子衍射分析表明，最终产物为Nb_（0.12）Cu_（0.45）Zn_（0.43）Fe_2O_4，晶格参数为0.8472nm。 Nb_（0.12）Cu_（0.45）Zn_（0.43）Fe_2O_4铁氧体的最大磁化强度（M_s），残余磁化强度（M_r），矫顽力（iH_c）和磁化率分别为11.30 Wb / m〜2 Kg，1.47 Wb / m 〜2 Kg，7321 A / m和0.02 m〜3 / kg。向铜锌铁氧体中添加铌分别使M_s，M_r和iM_c分别增加了约49％，68％和287％。磁性的变化与铌-铜-锌铁氧体的非化学计量数和氧位置有关。

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