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The effect of the Al2O3−Y2O3−ZrO2 sintering additive on compaction and mechanical properties of silicon carbide ceramics was studied in this work. The sintering additive was obtained by plasma-chemical synthesis. Sintering ceramic was carried out by hot pressing in the temperature range 1700-1800°C. With an increase in temperature, an increase in density and mechanical properties occurs. The ceramic material has a linear thermal expansion coefficient in the temperature range 20-1600°C equal to 3.9х10−6К−1. [ABSTRACT FROM AUTHOR]

Monophase ceramics based on silicon oxonitride was obtained in one technological stage, combining the synthesis of the aluminum oxonitride phase and its further densification by hot pressing at 1850°C in a nitrogen atmosphere. The obtained samples were characterized by scanning electron microscopy and X-ray phase analysis; the mechanical properties of the ceramic samples were measured. [ABSTRACT FROM AUTHOR]

The X-ray luminescence (XRL) properties of γ-AlON (γ-Al5O6N), β-SiAlON (Si6-nAlnOnN8-n, where n = 2 and 3) and Ca-α-SiAlON (Cam/2Si12-(m+n)Alm+nOnN16-n) oxynitride samples doped by Eu2+ were investigated. The strong correlation of luminescence spectra parameters of Eu2+ luminescence centers in dependence of oxynitride samples composition is observed. With fitting procedure the composition of XRL spectra with complex profile of investigated oxynitride samples of γ-AlON, β-SiAlON and Ca-α-SiAlON was identified and discussed. [ABSTRACT FROM AUTHOR]

Thermostimulated luminescence (TSL) of Al5O6N:Ce3+ and Al5O6N:Eu2+ with various dopant concentration has been investigated. Low-temperature TSL peaks in the range 300-500 K is observed. TSL curves approximated by sum of calculated curves with general-order kinetics. TSL intensity of samples with optimal dopant concentration (0.1 and 0.4 at. % for Ce3+ and Eu2+ respectively) is comparable with one of anion-defective corundum radiation detectors (TLD-500). [ABSTRACT FROM AUTHOR]

X-ray luminescence (XRL) and pulsed cathodoluminescence (PCL) spectra of Eu2+-doped aluminum oxynitride Al5O6N (prepared using the standard sol-gel technique) have been investigated. The radioluminescence spectra, concentration dependences of light yield and time parameters of luminescence process have been measured and discussed. Some peculiarities of luminescence spectra as well as the possible excitation mechanism of AL5O6N with Eu2+ dopants are discussed too. [ABSTRACT FROM AUTHOR]