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A newly modified correlation equation between defect-related positron lifetime τ 2 (ns) determined within two-state trapping model and corresponding radius of free-volume defects R (Å) in a full non-linear formτ2=0.285⋅1−RR+5.50+12π⋅sin2πRR+5.50−1or in a simplified linear formτ2=0.212⋅1+0.244⋅R.is proposed to account for compositional trends in free volume evolution of chalcogenide compounds...
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