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The glassy behaviour of poorly crystalline Fe2O3 nanorods obtained by thermal decomposition of ferrous oxalate

机译：草酸亚铁热分解制得的结晶度较差的Fe2O3纳米棒的玻璃态行为

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摘要

Nanorod ferrous oxalate dihydrate (FeC2O4 x 2H(2)O) which had been synthesized by the microemulsion method, was used as a precursor in the thermal decomposition process performed in air atmosphere. The formation of nanocrystalline hematite as the final product was preceded by the appearence of an intermediate product. Comprehensive study comprising several complementary techniques (x-ray diffraction, transmission electron microscopy, selected area electron diffraction, thermogravimetric/differential thermal analyses and SQUID magnetometry) confirmed that the intermediate product corresponds to the poorly crystalline Fe2O3. Due to the specific nanorod shape and poorly crystalline structure, the investigated Fe2O3 showed high coercive field value of similar to 0.5 T at 5 K. Special attention in this study was devoted to the peculiar magnetic properties of poorly crystalline Fe2O3, which were thoroughly investigated by employing sophisticated experimental procedures such as relaxation of thermoremanent magnetization for different cooling fields, zero field and field cooled memory effects as well as aging experiments for different waiting times. At low temperatures and weak applied magnetic fields, the investigated system behaves similarly to spin glasses, manifesting slow, collective relaxation dynamics of magnetic moments through memory, rejuvenation and aging effects.
机译：通过微乳液法合成的纳米棒草酸亚铁二水合物（FeC2O4 x 2H（2）O）被用作在大气中进行热分解的前体。作为最终产物的纳米晶赤铁矿的形成是在中间产物出现之前进行的。包括几种互补技术（X射线衍射，透射电子显微镜，选择区域电子衍射，热重/差热分析和SQUID磁强分析）的综合研究证实，中间产物对应于结晶度较弱的Fe2O3。由于特定的纳米棒形状和不良的晶体结构，所研究的Fe2O3在5 K时显示出高矫顽场值，接近0.5T。该研究特别关注了不良晶体Fe2O3的特殊磁性能，并对其进行了深入研究。采用复杂的实验程序，例如放宽对不同冷却场的剩磁，零场和场冷却记忆效应，以及针对不同等待时间的老化实验。在低温和弱外加磁场下，被研究的系统的行为类似于自旋玻璃，通过记忆，回春和衰老效应表现出磁矩的缓慢，集体松弛动力学。

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