Abstract: NaBaPO₄ powder with high emissivity is synthesized by solid state reaction. And infrared radiation properties of NaBaPO₄can be examined by XRD patterns, infrared transmittance spectra and infrared emissivity. NaBaPO₄ powder, when doped with Mg²⁺, Ca²⁺ and Sr²⁺, will change the bond strength of metal ions and oxygen ions. It can also change the lattice vibration and increase the infrared emissivity. Among the materials of NaBaPO₄, we found that the NaBa_0.85Mg_0.15PO₄can reach the emissivity as high as 0.924 at the wave range of 8～14 μm.

Key words: NaBaPO₄; infrared radiation; emissivity; doped