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Atomic-deficient free-volume transformations in directly synthesized β-As4S4 arsenical subjected to nanostructurization due to high-energy speed-increased (0–200–500–600 rpm) milling are comprehensively studied employing lifetime spectroscopy of annihilating positrons. These data testify that nanocrystalline and amorphous forms coexist among milling products, testifying in favor of milling-driven...
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