A 50:50 vol% MgO-Y2O3 nanocomposite with ~nm grain size was prepared in an attempt to make 3-5um infrared-transmitting windows with increased durability and thermal shock resistance. Flexure strength of the composite at 21 deg C is 679 MPa for 0.88 cm/2 under load. Hardness is consistent with that of the constituents with similar grain size. For 3-mm-thick material at 4.85 um, the total scatter loss is 1.5%, forward scatter is 0.2% and absorptance is 1.8%. Optical scatter below 2um is 100%. Variable intensity OH absorption (~6% absorptance) is observed near 3um. The refractive index is ~0.4% below the volume-fraction-weighted average of those of the other constituents. Thermal expansion is equal to the volume-fraction-weighted average of expansion of the constituents. Specific heat capacity is equal to the mass-fraction-weighted average of heat capacities of the constituents. Thermal conductivity lies between those of the constituents up to 1200K. Elastic constants lie between those of hte constituents. The Hasselman mild thermal shock resistance parameter for the composite is twice as great as that of common 3-5um window materials, but half as great as that of c-plane sapphire.
