Zinātniskie raksti (CFI) / Scientific articles

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Optical properties of powder and ceramics of aluminium oxynitride obtained by self-propagating high-temperature synthesis
(Lithuanian Physical Society, 2021) Akopdzhanyan, T.G.; Kondakov, A.A.; Rupasov, S.I.; Kozlova, A.P.; Pankratov, Vladimir
The synthesis method of aluminium oxynitride (AlON) powders by nitriding of Al/Al2 O3 mixture under high-pressure nitrogen is proposed. The novelty of this method consists in adding KClO4 or Mg(ClO4 )2 and extra Al into the starting mixture (Al+Al2 O3 ) to cause the exothermal aluminium oxidation reaction, which therefore initiates the aluminium nitriding reaction. The microstructure and phase composition of the AlON powders obtained by self-propagating high-temperature synthesis are demonstrated by means of SEM and XRD analysis. Diffuse reflection spectra of AlON powders have been measured and the values of band-gap energy have been calculated. Optical transmission and reflection characteristics of the AlON ceramic samples sintered from AlON powders at 1930°C have been studied. The influence of the technological parameters of ceramics production on their transparency is revealed – the most transparent sample is obtained from the powders synthesized with the Mg(ClO4 )2 additive and sintered for 6 h. © Lietuvos mokslų akademija, 2021.