F. Muktepavela*, J. Maniks, L. Grigorjeva, R. Zabels, P. Rodnyi, E. Gorokhova
Transparent ZnO ceramics are of interest for use as material for highefficiency fast scintillators. Doping ZnO ceramics in order to improve complex of their properties is a promising direction. In the present research, the role of indium in the ZnO nanopowders surface interactions and in the change of microstructures and photoluminescence (PL) characteristics of sintered ceramics is considered. Undoped and 0.13 wt% In doped ZnO ceramics are obtained by hot pressing sintering. It has been found that indium leads to the transition of initially faceted ZnO particles to rounded, contributing to good sintering with formation of diffusion active grain boundaries (GBs). Unlike ZnO ceramics, ZnO:In ceramics microstructure is characterised by the transcrystalline mode of fracture, faceted GBs with places of zig-zag forms and predominant distribution of In at the GBs. Such indium induced modifications of GBs promote removal of point defects and reduce PL parameter α = Idef/Iexc in comparison with the undoped ceramics. Results characterise ZnO:In ceramics with improved GBs properties as a prospective material for scintillators.
Published in LATVIAN JOURNAL OF PHYSICS AND TECHNICAL SCIENCES