The undoped, and Er-doped yttrium aluminozirconate (AYZ) glasses were prepared by ame synthesis in the form of transparent glass microbeads. The ZrO2 content was in the range between 5 and 20 mol. %. The prepared glass microbeads were characterised by optical microscopy, SEM, XRD, DSC, 27 Al MAS NMR, UV VISNIR and uorescence spectroscopy. The thermal stability of AYZ glasses, expressed in terms of the dierence between the glass transition temperature, Tg, and the onset of crystallization, Tx,

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... s not aected by the increasing ZrO2 content. The 27 Al MAS NMR spectra of studied glass samples reveal that Al atoms are predominantly 4coordinated in glasses. The AYZ5 and AYZ10 basic glasses were doped with Er 3+ at the level of 15 mol. % of Er2O3. The UVVISNIR/uorescence spectra show characteristic absorptions/emissions, due to the optically active Er 3+ ions in the host glasses. The absorption/emission properties of guest ions are not signicantly aected by the glass host.