Funct. Mater. 2019; 26 (4): 829-837.
Y2O3-MgO highly-sinterable nanopowders for transparent composite ceramics
1Institute for Single Crystals, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61072 Kharkiv, Ukraine
2Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 201899 Shanghai,China
3V.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
4Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159 100-let Vladivostoku Avenue, 690022 Vladivostok, Russian Federation
5SSI "Institute for Single Crystals", STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61072 Kharkiv, Ukraine
Composite nanopowders Y2O3-MgO (1:1 by volume) were synthesized by the method of self-propagating glycine-nitrate synthesis with an excess of glycine and nitric acid. It was shown that freshly prepared powder (precursor) contains about 19 % of unreacted components and intermediate reaction products, which are removed by subsequent calcining. Crystallization of the precursor starts at calcination temperature above 600°C and leads to nucleation of the crystalline phases MgO and Y2O3. It was shown that calcining at temperatures from 800 to 1000 °C leads to the formation of nanocrystals with sizes from 20 to 90 nm, respectively. The specific surface area of composite nanopowders decreases from 48 to 16 m2/g with increasing calcination temperature in the range T = 700-1000°C. It was shown that during Y2O3-MgO calcination in the air, intense chemisorption of CO2 occurs on the surface of nanopowders. According to calculations, about 5 % of MgO is converted to magnesium carbonate. Finally,Y2O3-MgO composite ceramics with average grain size of 255 nm and transmittance of 71 % at λ = 6000 nm have been obtained by spark plasma sintering of synthesized nanopowders.
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