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首页> 外文期刊>Journal of magnetism and magnetic materials >The effect of particle size on structural and magnetic properties of Sm~(3+) ion substituted Zn-Mn nanoferrites synthesized by glycol-thermal method
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The effect of particle size on structural and magnetic properties of Sm~(3+) ion substituted Zn-Mn nanoferrites synthesized by glycol-thermal method

机译：粒径对三醇热法合成的SM〜（3+）离子取代Zn-Mn纳米铁矿石结构和磁性的影响

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摘要

Zn_(0.5)Mn_(0.5)Sm_xFe~(2-x)O_4 (0 ≤ x 0.05) fine powders with average crystallite sizes in the range 12-17 nm were synthesized by glycol-thermal reaction. The as-prepared compounds were subjected to thermal annealing process at 1100 °C, after which the crystallite sizes increased to about 60 nm. XRD analysis confirmed a single-phase cubic spinel structure in all the compounds investigated. TEM images showed nearly spherical particles with uniform particle size distributions. SEM and FTIR have been used to study morphology and confirm phase formation, respectively. The Moessbauer spectrum for Zn_(0.5)Mn_(0.5)Fe_2O_4 (x = 0) at room temperature may be resolved into two quadrupole doublets indicative of paramagnetic spin state. Sm~(3+) substituted compounds showed weak sextets in addition to broad doublets attributed to some particle magnetic moments in ordered magnetic phase. The Moessbauer spectra of the compounds annealed at 1100 °C exhibit magnetic split sextets indicative of ordered magnetic phase. The compounds have small coercive fields and high saturation magnetization (40 emu/g to 60 emu/g) which reduce with increasing Sm~(3+) content due to the paramagnetic nature of Sm~(3+) ions. Magnetic measurements as a function of field and temperature in as-prepared particles showed superparamagnetic behaviour with average moment of about ≈ 10~4μ_B. The average particle size obtained from the magnetic data corresponds well with that estimated from XRD analysis.
机译：Zn_（0.5）Mn_（0.5）SM_XFE〜（2-X）O_4（0≤x0.05）具有12-17nm范围内的平均微晶尺寸的细粉末通过二醇 - 热反应合成。在1100℃下进行制备的化合物在1100℃下进行热退火工艺，之后结晶尺寸增加至约60nm。 XRD分析证实了所有化合物中的单相立方尖晶石结构。 TEM图像显示几乎是球形颗粒，粒度均匀分布。 SEM和FTIR分别用于研究形态和确认相形成。可以将室温下的Zn_（0.5）Mn_（0.5）Fe_2O_4（X = 0）的Moessbauer光谱分解为指示顺磁旋转状态的两个四极倍数。除了有序磁相中，SM〜（3+）取代的化合物除了绘制的较大双峰之外，还显示出较弱的六号。在1100℃下退火的化合物的Moessbauer光谱表现出指示有序磁相的磁性分裂六号。该化合物具有小的矫顽电场和高饱和磁化强度（40兆/克至60 emu / g），其由于SM〜（3+）离子的顺磁性而增加了SM〜（3+）含量。磁性测量作为现场和温度的颗粒的函数，显示出超顺磁性行为，平均矩约为≈10~4μ_b。从磁数据获得的平均粒度很好地对应于XRD分析的估计。

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