[PDF]  https://doi.org/10.3952/physics.v61i3.4516

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 61, 169–176 (2021)
 

OPTICAL PROPERTIES OF POWDER AND CERAMICS OF ALUMINIUM OXYNITRIDE OBTAINED BY SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
Tigran A. Akopdzhanyana, Alex A. Kondakova, Sergey I. Rupasovb, Anna P. Kozlovab, and Vladimir Pankratovc
  a ISMAN, 8 Academician Osipyan Street, Chernogolovka, 142432 Moscow Region, Russia
b NUST MISIS, 4 Leninskiy prospekt, 119049 Moscow, Russia
c Institute of Solid State Physics, University of Latvia, 8 Kengaraga iela, 1063 Riga, Latvia
Email: tigj@yandex.ru

Received 18 December 2020; revised 9 April 2021; accepted 21 April 2021

The synthesis method of aluminium oxynitride (AlON) powders by nitriding of Al/Al2O3 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+Al2O3) 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.
Keywords: aluminium oxynitride, AlON, self-propagating high-temperature synthesis, combustion, optical properties, transparent ceramics
PACS: 81.05.Je, 81.20.Ka, 78.20.-e

SAVAIME SKLINDANČIOS AUKŠTATEMPERATŪRINĖS SINTEZĖS BŪDU GAUTŲ ALIUMINIO OKSINITRIDO MILTELIŲ IR JŲ KERAMIKŲ OPTINĖS SAVYBĖS
Tigran A. Akopdzhanyana, Alex A. Kondakova, Sergey I. Rupasovb, Anna P. Kozlovab, Vladimir Pankratovc

a Rusijos MA Struktūrinės makrokinetikos institutas, Maskvos srtis, Rusija
b Nacionalinis mokslo ir technologijų universitetas Maskvos plieno ir lydinių institutas, Maskva, Rusija
c Latvijos universiteto Kietojo kūno fizikos institutas, Ryga, Latvija


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