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首页> 外文期刊>Journal of Crystal Growth >Synthesis of superparamagnetic Mn_3O_4 nanocrystallites by ultrasonic irradiation
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Synthesis of superparamagnetic Mn_3O_4 nanocrystallites by ultrasonic irradiation

机译:超声辐照合成超顺磁性Mn_3O_4纳米微晶

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摘要

Nanocrystalline Mn_3O_4 has been synthesized by ultrasonic irradiation of Mn acetate solution in water. Analysis of its X-ray diffraction data shows formation of a phase-pure compound with an average particle size of about 15 nm. DC magnetization measurements as a function of temperature and field show a reduced ferrimagnetic transition temperature (T_c ≈ 39 K) as compared to those reported for the bulk (T_c ≈ 43 K), and a subsequent observation of superparamagnetic behavior at 40 K. The observed magnetic properties are suggestive of formation of a single domain magnetically ordered Mn_3O_4 nanoparticles below their ferrimagnetic transition temperature.
机译:纳米晶Mn_3O_4是通过超声乙酸锰溶液在水中合成的。对其X射线衍射数据的分析表明,形成了平均粒径约为15 nm的纯相化合物。直流磁化强度随温度和磁场的变化关系显示,与所报告的整体磁化温度(T_c≈43 K)相比,亚铁磁性转变温度(T_c≈39 K)降低,随后观察到在40 K时超顺磁行为。磁性暗示在其亚铁磁性转变温度以下形成单畴磁性有序的Mn_3O_4纳米粒子。

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