Effect of graphene on the mechanochemical activation of cobalt ferrite nanoparticles
Effect of graphene on the mechanochemical activation of cobalt ferrite nanoparticles
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石墨烯对钴铁氧体纳米粒子机械化学活化的影响
DOI：
10.1016/j.jpcs.2020.109866
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发表时间：
2021
影响因子：
4
通讯作者：
McHenry, Michael
中科院分区：
文献类型：
--
作者：
Sorescu, Monica;Jubeck, Jordan;Knauss, Matthew;Perrin, Alice;McHenry, Michael
将钴铁氧体纳米颗粒暴露于机械化学活化，具有和不具有等摩尔量的石墨烯纳米颗粒，持续0至12小时的时间段。它们的结构和磁性详细的穆斯堡尔谱和磁性测量。对应于未研磨的钴铁氧体粉末的穆斯堡尔谱使用对应于铁氧体的四面体和八面体位置的2个六重体来分析。其余的光谱使用额外的四极分裂双峰进行去卷积，丰度接近30%，并被分配给超顺磁性颗粒。此外，与石墨烯研磨最长时间相对应的光谱需要第三个六重峰，这可以归因于碳化铁。从穆斯堡尔谱确定的反转的程度，并发现随着研磨时间的减少，无论是与和没有石墨烯的设置。推导出倾斜角，并将其作为两组样品的球磨时间的函数进行研究。磁滞回线记录在5 K，在施加的磁场为5 T，并被发现表现出蜂腰形状。使用零场冷却场冷却（ZFC-FC）测量，在5-300 K的范围内，使用200 Oe的外加磁场，将磁化强度绘制为温度的函数。这使得有可能确定样品的阻断温度。我们的数据展示了与石墨烯纳米颗粒和没有石墨烯纳米颗粒研磨的钴铁氧体纳米粉末的新特性。
Cobalt ferrite nanoparticles were exposed to mechanochemical activation, with and without equimolar amounts of graphene nanoparticles, for time periods ranging from 0 to 12 h. Their structural and magnetic properties were detailed from Mӧssbauer spectroscopy and magnetic measurements. The Mӧssbauer spectrum corresponding to the unmilled cobalt ferrite powder was analyzed using 2 sextets, corresponding to the tetrahedral and octahedral sites of ferrites. The rest of the spectra was deconvoluted using an additional quadrupole-split doublet, with an abundance close to 30% and was assigned to superparamagnetic particles. Moreover, the spectra corresponding to milling with graphene at the longest times needed a third sextet, which could be assigned to iron carbide. The degree of inversion was determined from the Mӧssbauer spectra and found to decrease with milling time, both for the set with and that without graphene. The canting angle was derived and studied as function of the ball milling time for both sets of samples. Hysteresis loops were recorded at 5 K in an applied magnetic field of 5 T and was found to exhibit a wasp-waist shape. Magnetization was plotted as function of temperature in the range 5–300 K with an applied magnetic field of 200 Oe using zero-field-cooling-field-cooling (ZFC-FC) measurements. These made it possible to determine the blocking temperature of the samples. Our data exhibit new characteristics of the cobalt ferrite nanopowders milled with and without graphene nanoparticles.
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