Synthesis and Thermophysical Properties of Ceramics Based on Magnesium Gallate

• Published in: Russian journal of inorganic chemistry 2021-07, Vol.66 (7), p.957-962
• Main Authors: Kondrat’eva, O. N., Nikiforova, G. E., Smirnova, M. N., Pechkovskaya, K. I.
• Format: Article
• Language: English
• Subjects: Ceramic powders; Ceramics; Chemical composition; Chemistry; Chemistry and Materials Science; Diffusivity; High temperature; Inorganic Chemistry; Magnesium; Sintering (powder metallurgy); Synthesis and Properties of Inorganic Compounds; Theoretical density; Thermal conductivity; Thermal diffusivity; Thermophysical properties; X ray fluorescence analysis; X ray powder diffraction
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023621070068

A ceramic was produced from a nanocrystalline magnesium gallate powder synthesized by the gel combustion method, and the thermal diffusivity of the ceramic at high temperatures was experimentally investigated. The phase and chemical composition of the MgGa 2 O 4 ceramic powder was studied by X-ray powder diffraction analysis, X-ray fluorescence spectroscopy, and CHNS elemental analysis. The microstructural parameters of the obtained ceramic material were determined by scanning electron microscopy. The average particle size of the MgGa 2 O 4 powder was found to be 80 nm. The ceramic produced by sintering the compacted MgGa 2 O 4 powder at 1673 K in air had a density of 4670 kg/m 3 (88% of the theoretical density). The average size of the crystalline grains of the ceramic after sintering did not exceed 1 μm. The thermal diffusivity of the ceramic based on MgGa 2 O 4 in the temperature range 300–1173 K was for the first time studied by the laser flash method. It was found that its thermal conductivity in the studied temperature range decreased from 2.25 to 0.96 W/(m K).