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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis of M-type SrFe12O19 by mechanosynthesis assisted by spark plasma sintering
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Synthesis of M-type SrFe12O19 by mechanosynthesis assisted by spark plasma sintering

机译：火花等离子体烧结机械合成法合成M型SrFe12O19

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摘要

We present a comparative study of synthesis of M-type strontium hexaferrite from strontium and iron single oxides mechanically activated by high-energy ball milling for 5 h, and assisted by two different methods: (a) conventional heat treatment and (b) Spark Plasma Sintering (SPS), both at relative low temperatures (<= 900 degrees C). Although it was found that both methods promoted the complete structural transformation of precursors to Sr-hexaferrite phase (S.G. Pmc21) for temperatures above 700 degrees C, higher saturation magnetization was found for SPS samples. X-ray diffraction analysis revealed that the structural transformation undergoes formation of an intermediate metastable structure (Fe2Sr2O5) in both methods, but with slight different kinetics. Maximum specific magnetization of 67 emu/g at 18 kOe and coercivity of 3.7 kOe were recorded from powder mixtures milled for 5 h, which were subsequently SPS-ed at 700 degrees C. By contrast, although magnetization values for the same milled samples after being annealed at 700 degrees C slightly decreased, it leads to a significant increase in the coercive field reaching 5.4 kOe. These results are explained on the basis of factors such as the complete formation of hexaferrite and the attained density of consolidated powders, in addition to particle and grain sizes also reported. (C) 2014 Elsevier B.V. All rights reserved.
机译：我们提供了由锶和铁单氧化物通过高能球磨机械活化5小时并通过两种不同的方法辅助合成M型六价铁锶的比较研究：（a）常规热处理和（b）放电等离子体均在相对较低的温度（<= 900摄氏度）下烧结（SPS）。尽管发现在高于700摄氏度的温度下，两种方法均能促进前体向Sr-六价铁氧体相（S.G. Pmc21）的完整结构转变，但发现SPS样品的饱和磁化强度更高。 X射线衍射分析表明，在两种方法中，结构转变都经历了中间亚稳结构（Fe2Sr2O5）的形成，但动力学略有不同。从研磨5小时的粉末混合物中记录了在18 kOe时的最大比磁化强度为67 emu / g，矫顽力为3.7 kOe，随后在700摄氏度下SPS进行了粉末研磨。在700摄氏度的温度下退火略有降低，导致矫顽场显着增加，达到5.4 kOe。这些结果是根据诸如六方铁氧体的完全形成和固结粉末达到的密度等因素进行解释的，此外还报告了颗粒和晶粒尺寸。 （C）2014 Elsevier B.V.保留所有权利。

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