Milling-driven nanonization of AsxS100-x alloys from second glass-forming region: The case of lower-crystalline arsenicals (56<x<66)
ČlánekOmezený přístuppeer-reviewedpostprint (accepted version)Datum publikování
2020
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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.
Rozsah stran
p. 120339
ISSN
0022-3093
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LM2018103/Výzkumná infrastruktura CEMNAT
Zdrojový dokument
Journal of Non-Crystalline Solids, volume 549, issue: December
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https://www.sciencedirect.com/science/article/pii/S0022309320304518?via%3Dihub
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Článek ve verzi „postprint“ bude přístupný od 09.08.2022.
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phase transitions, nanonization, arsenic sulphides, X-ray powder diffraction, micro-Raman scattering, differential scanning calorimetry, fázová transformace, nanonizace, sulfid arsenu, rentgenová difrakce, mikro-Raman, diferenciální skenovací kalorimetrie