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Milling-driven nanonization of AsxS100-x alloys from second glass-forming region: The case of lower-crystalline arsenicals (56
Journal of Non-Crystalline Solids ( IF 3.2 ) Pub Date : 2020-08-09 , DOI: 10.1016/j.jnoncrysol.2020.120339
O. Shpotyuk , S. Kozyukhin , P. Demchenko , Y. Shpotyuk , A. Kozdras , M. Vlcek , A. Kovalskiy , Z. Bujňáková Lukáčová , P. Baláž , V. Mitsa , M. Veres

Competitive intercrystalline phase-transformation and amorphization effects under high-energy mechanical milling are studied in AsxS100-x alloys from low-crystallinity domain (56<x<66) of the second glass-forming region (51<x<66), employing complementary X-ray powder diffraction analysis, micro-Raman scattering spectroscopy, heat flow differential scanning calorimetry and temperature-modulated multifrequency DSC TOPEM® methods. Milling is shown to activate preferential generation of nanosized monoclinic β-As4S4 phase in these AsxS100-x arsenicals at low As content (50<x<60) accompanied by appearance of isocompositional amorphous phase. Principal scenario of milling-driven interphase disproportionality in these arsenicals with high As content (58<x<66) is identified as plastic-crystalline rhombohedral β-As4S3 phase generation supplemented by extraction of As-rich amorphous substance probably of As4S2 composition. Appearance of amorphous a-As4S2 phase with relatively low glass-transition temperature of ~50 °C is supplemented to β-As4S4 polymorph stabilized along with nanostructured plastic-crystalline nc-β-As4S3 phase. Temperature-depressing effects of milling on calorimetric heat-transfer processes are revealed in whole compositional domain of the studied nanoarsenicals.



中文翻译:

来自第二个玻璃形成区域的As x S 100- x合金的铣削驱动纳米化:低结晶砷的情况(56 < x <66)

研究了来自第二玻璃形成区域(51 < x <66)的低结晶度域(56 < x <66)的As x S 100-x合金在高能机械铣削下的竞争晶间相变和非晶化效应,采用补充X射线粉末衍射分析,微拉曼散射光谱,热流差示扫描量热法和温度调制多频DSCTOPEM®方法。研磨被示出为激活优惠代的纳米斜晶系β-作为4 š 4在这些作为相X小号100-x中砷化合物在低As含量(50 < X<60)伴有同构非晶相的出现。铣削驱动相间不成比例在这些砷化合物具有高As含量的主要场景(58 < X <66)被识别为塑料结晶菱形β-作为4 š 3相位生成由大概由于作为富无定形物质的提取补充4 S 2组成。的无定形的A-作为外观4 š 2相〜50的相对低的玻璃化转变温度℃的补充,以β-作为4 š 4多晶型物与纳米结构的塑料结晶NC-β-作为沿着稳定的4 š 3相。在所研究的纳米砷的整个组成域中揭示了铣削对热量传递过程的降温效果。

更新日期:2020-08-09
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