Thermal diffusivity and conductivity of ceramics based on the GdFeO3– GdCrO3 system
Kenges K.M. Enikeeva M.O. Tomovich M.V. Тugova
April 2025Elsevier Ltd
Ceramics International
2025#51Issue 1013271 - 13276 pp.
Gadolinium ferrochromites were successfully synthesized as continuous solid solutions in the GdFeO3 – GdCrO3 system via solid-state reaction. Structural and microstructure analyses revealed the formation of an orthorhombic perovskite-type phase with isometric chain-like grains. SEM data demonstrated a systematic decrease in the average grain size, from ∼9.0 μm to ∼2.0 μm, as the Cr content increased. The thermal properties, including thermal diffusivity and thermal conductivity, were investigated using the laser-flash diffusivity method. Thermal diffusivity was observed to decrease with increasing Cr substitution, consistent with enhanced phonon scattering induced by finer grains and increased porosity. Compositions with x = 0.50 and 0.77, sintered at 1400 °C for 24 h, exhibited optimal thermal insulation properties, characterized by porosity levels of 44–48 % and thermal conductivities of 0.6–0.7 W/(m∗K) at room temperature. These findings demonstrate that the microstructure and thermal properties of GdFe1-xCrxO3 oxides can be tuned through Cr doping, making them promising candidates for thermal insulation applications in high-temperature conditions.
A. powders: solid state reaction , B. Electron microscopy , B. X-ray methods , C. Thermal properties , D. Perovskites , E. Thermal applications
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Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Ioffe Institute, 26 Politekhnicheskaya, St Petersburg, 194021, Russian Federation
Center of Physical-Chemical Methods of Research and Analysis
Ioffe Institute
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