Abstract
BaGa2O4 ceramics doped with Eu3+ ions (1, 3 and 4 mol.%) were obtained by solid-phase sintering. The phase composition and microstructural features of ceramics were investigated using X-ray diffraction and scanning electron microscopy in comparison with energy-dispersive methods. Here, it is shown that undoped and Eu3+-doped BaGa2O4 ceramics are characterized by a developed structure of grains, grain boundaries and pores. Additional phases are mainly localized near grain boundaries creating additional defects. The evolution of defect-related extended free volumes in BaGa2O4 ceramics due to the increase in the content of Eu3+ ions was studied using the positron annihilation lifetime 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.
Highlights
BaGa2 O4 ceramics are considered to be promising material for use as an insulator in optoelectronic devices [1,2], as a secondary coating for plasma panels [3,4,5], etc. [6]
The structural features and evolution of free-volume defects in BaGa2 O4 ceramics obtained by solid-phase synthesis from the initial BaCO3 and Ga2 O3 components with the addition of different amounts of Eu2 O3 content (1, 3 and 4 mol.%) were investigated
It is established that, according to the quantitative analysis of the elemental composition, samples of the undoped BaGa2 O4 ceramics have the largest deviations from the stoichiometric composition; they have three phases
Summary
BaGa2 O4 ceramics are considered to be promising material for use as an insulator in optoelectronic devices [1,2], as a secondary coating for plasma panels [3,4,5], etc. [6]. The doping of impurities in the form of rare-earth ions leads to the expansion of the functional properties of such ceramics [7]. The most interesting are rare-earth-doped BaGa2 O4 ceramics Most investigations of such material are limited to X-ray diffraction (XRD), optical studies, etc. The doping of such ceramics leads to the modification of their luminescent properties and changes in phase composition, and causes structural transformation [20,21]. This significantly transforms the inner structure of ceramics forming additional defect-related free volumes [22,23,24,25,26,27]
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