STUDY OF PHASE FORMATION IN FE2O3-ND2O3→NDFEO3/FE2O3 NANOCOMPOSITES AS A RESULT OF THERMAL ANNEALING

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY
K. Egizbek, K. Kadyrzhanov
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Abstract

The aim of this work is systematic study of the thermal annealing effect on the preparation of nanostructured composites NdFeO3/Fe2O3 with a spinel type structure. The interest in these nano­composites is due to the enormous potential of their application as a basis for magnetic devices, catalysts, and magnetic carriers for targeted drug delivery. As a synthesis method, two­stage syn­thesis was used, which includes mechanochemical grinding of nanopowders Fe2O3 and Nd2O3 in a planetary mill, followed by thermal annealing of the resulting mixture in a wide temperature range: 600­1000°C. During the studies carried out, it was found that in the initial state the obtained nano­composites are a mixture of a solid solution of interstitial and substitutional Fe2O3 and Nd2O3. At an annealing temperature of 600°C, the onset of the formation of the NdFeO3 phase is observed, which at a temperature of 1000°C is fully formed and dominates in the composite structure (content more than 85%). It was also found that during thermal sintering, the processes of phase transformations of the Fe2O3­Nd2O3→NdFeO3/Fe2O3 type are accompanied by an increase in the particle size by a factor of 1.5­2
fe3o3和fe3o3相形成的研究→ndfe3/FE2O3纳米复合材料的热退火研究
本文系统研究了热退火对制备尖晶石型纳米结构NdFeO3/Fe2O3复合材料的影响。对这些纳米复合材料的兴趣是由于它们作为磁性装置、催化剂和靶向药物递送磁性载体的基础的巨大潜力。作为一种合成方法,采用两阶段合成,包括在行星磨机中对纳米粉末Fe2O3和Nd2O3进行机械化学研磨,然后在600-1000°C的宽温度范围内对所得混合物进行热退火。在研究过程中发现,在初始状态下,得到的纳米复合材料是Fe2O3和Nd2O3的间隙和取代固溶体的混合物。在600℃的退火温度下,观察到NdFeO3相开始形成,在1000℃的退火温度下,NdFeO3相完全形成,在复合结构中占主导地位(含量大于85%)。在热烧结过程中,Fe2O3 - nd2o3→NdFeO3/Fe2O3型的相变过程伴随着晶粒尺寸的增大,增大幅度为1.5 ~ 2倍
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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