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Effect of high‐energy mechanical milling on the medium‐range ordering in glassy As‐Se
Author(s) -
Shpotyuk Yaroslav,
Demchenko Pavlo,
Bujňáková Zdenka,
Baláž Peter,
BoussardPledel Catherine,
Bureau Bruno,
Shpotyuk Oleh
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16877
Subject(s) - diffraction , materials science , crystallography , x ray crystallography , planar , optics , chemistry , physics , computer graphics (images) , computer science
Effect of high‐energy mechanical milling on glassy As x Se 100 − x (5 ≤ x ≤ 75) is recognized with X‐ray powder diffraction analysis applied to their diffuse halos ascribed to intermediate—and extended‐range structural ordering, which are revealed respectively in the first sharp diffraction peak (FSDP) and principal diffraction peak (PDP). Straightforward interpretation of the results is developed within modified microcrystalline approach , treating diffuse halos as superposition of broadened Bragg‐diffraction reflexes from remnants of inter‐planar correlations , supplemented by inter‐atomic Ehrenfest‐diffraction reflexes from most prominent inter‐atomic and inter‐molecular correlations between cage‐like molecules (such As 4 Se 4 and/or As 4 Se 3 ). Milling is shown to be ineffective in glassy arsenoselenides near Se ( x < 20), while causing increase in the FSDP width for glasses with 20 ≤ x ≤ 40 due to destroyed inter‐planar ordering. Remnants of cage‐like molecules in over‐stoichiometric As‐rich As x Se 100 − x glasses (40 ≤ x ≤ 75) disappear under milling, promoting formation of higher polymerized structural network. This milling‐driven reamorphization results in a drastic increase in the FSDP position and fragmentation impact on the correlation length of the FSDP‐responsible entities. Breakdown in intermediate‐range ordering in these glasses is accompanied by changes in their extended‐range ordering revealed in high‐angular shift and broadening of the PDP. This effect is concomitant with the disappearance of distant inter‐atomic correlations between quasi‐crystalline planes in the milled arsenoselenide glasses at a cost of prolonged correlations dominating in their extended‐range ordering.