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A glycine-nitrate self-propagating high-temperature synthesis (SHS) was developed to produce composite MgO-Gd 2 O 3  nanopowders. The X-ray powder diffraction (XRD) analysis confirmed the SHS-product consists of cubic MgO and Gd 2 O 3  phases with nanometer crystallite size and retains this structure after annealing at temperatures up to 1200 °C. Near full dense high IR-transparent composite ceramics were fabricated by spark plasma sintering (SPS) at 1140 °C and 60 MPa. The in-line transmittance of 1 mm thick MgO-Gd 2 O 3  ceramics exceeded 70% in the range of 4–5 mm and reached a maximum of 77% at a wavelength of 5.3 mm. The measured microhardness HV0.5 of the MgO-Gd 2 O 3  ceramics is 9.5±0.4 GPa, while the fracture toughness ( K  IC ) amounted to 2.0±0.5 MPa·m 1/2 . These characteristics demonstrate that obtained composite MgO-Gd 2 O 3  ceramic is a promising material for protective infra-red (IR) windows.

IR-transparent MgO-Gd2O3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering