Structural, luminescent, mechanical and bactericidal properties of ceramics and fine powders of erbium orthoniobate tantalates

Photoluminescence spectra of the studied ErNbxTa1-xO4 (x = 0; 0.1; 0.3; 0.5; 0.7; 0.9; 1) ceramics were obtained with using an spectrofluorimeter AvaSpec-3648 (Avantes BV, Apeldoorn, the Netherlands) when excited at a wavelength of 980 nm by a single-mode laser module KLM-H980 (PTI “Optronik”, St. Petersburg, Russia) in the IR range with a continuous radiation power of 120/200 mW. The operating wavelength range of the AvaSpec-3648 device is 330-980 nm with a resolution of 0.025 nm. The measurement step was 0.17 nm.