Ferroelasticity and infrared emissivity of (Nd1－xCax)(Al1－xFex)O3－x/2 (x=0-0.3)

Using a high temperature solid state reaction at 1600 ℃ for 6 h, (Nd1－xCax)(Al1－xFex)O3－x/2(x=0, 0.1, 0.2, 0.3) was synthesized by introducing Ca2+ and Fe3+ into NdAlO3, and spark plasma sintering (SPS) ceramic samples were used to investigate the effects of Ca2+ and Fe3+ addition on the phase composition, emissivity and ferroelasticity of NdAlO3. The results show that a solid solution can be successfully fabricated through the high temperature solid state reaction. The doping of Ca2+ and Fe3+ in NdAlO3 increases oxygen vacancies and slight lattice distortion occurs, emissivity of NdAlO3 within the wavelength range of 2.5-10 μm increases the maximum to 0.9. The introduction of impurity ions makes the phase gradually transform from rhombohedral to cubic, leading to the ferroelastic domains vanish. However, the fracture toughness of ceramic samples remains at a high level.