Abstract
The BaGa2O4 ceramics doped with Eu3+ ions (1, 3 and 4 mol%) are obtained by solid‐phase sintering. The evolution of defect‐related extended free volumes in the BaGa2O4 ceramics due to the increase of the content of Eu3+ ions has been studied using the positron annihilation lifetime (PAL) spectroscopy technique. It is established that the increase in the number of Eu3+ ions in the basic BaGa2O4 matrix leads to the agglomeration of free‐volume defects with their subsequent fragmentation. The presence of Eu3+ ions results in the expansion of nanosized pores and an increase in their number with their future fragmentation.
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