Magnetic Properties and AC Losses in AFe2O4 (A = Mn, Co, Ni, Zn) Nanoparticles Synthesized from Nonaqueous Solution
Magnetic Properties and AC Losses in AFe2O4 (A = Mn, Co, Ni, Zn) Nanoparticles Synthesized from Nonaqueous Solution
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DOI：
10.1155/2015/532198
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发表时间：
2015-03
影响因子：
3
通讯作者：
O. Yelenich;S. Solopan;T. Kolodiazhnyi;Y. Tykhonenko;A. Tovstolytkin;A. Belous
中科院分区：
文献类型：
--
作者：
O. Yelenich;S. Solopan;T. Kolodiazhnyi;Y. Tykhonenko;A. Tovstolytkin;A. Belous
以硝酸盐为起始原料，采用共沉淀法从非水溶液中合成了纳米级AFe2O4（A = Mn，Co，Ni，Zn）尖晶石铁氧体。通过X射线衍射、透射电子显微镜和磁性测量对颗粒进行了表征。准静态磁性测量显示钴、镍和锌尖晶石铁氧体纳米颗粒的超顺磁性行为，其阻断温度低于室温。已经确定了颗粒的特征磁性参数，包括单个纳米颗粒的平均磁矩和阻断温度。计算和实验测量了合成粒子系综暴露于磁场时释放的比损耗功率。结果表明，在所研究的所有纳米铁氧体中，ZnFe2O4纳米颗粒在交流磁场中表现出最高的加热效率。确定了影响交流磁场加热效率的关键参数。提出了提高SLP值的方向。
Nanosized particles of AFe2O4 (A = Mn, Co, Ni, or Zn) spinel ferrites were synthesized by coprecipitation from nonaqueous solutions using nitrate salts as starting reagents. The particles were characterized by X-ray diffraction, transmission electron microscopy, and magnetic measurements. Quasistatic magnetic measurements show superparamagnetic behavior with blocking temperature below room temperature for cobalt, nickel, and zinc spinel ferrite nanoparticles. Characteristic magnetic parameters of the particles including average magnetic moment of an individual nanoparticle and blocking temperature have been determined. The specific loss power which is released on the exposure of an ensemble of synthesized particles to a magnetic field is calculated and measured experimentally. It is shown that among all nanoferrites under study, the ZnFe2O4 nanoparticles demonstrate the highest heating efficiency in AC magnetic fields. The key parameters responsible for the heating efficiency in AC magnetic field have been determined. The directions to enhance the SLP value have been outlined.