This work aims to investigate the influence of Ca $^{2 +}$ $^{2 +}$ doping on the infrared emission properties of DyTa₃O₉ ceramics. DyTa₃O₉ is considered a promising high-temperature thermal protection material due to its low thermal conductivity and good high-temperature stability. However, there is currently no research on the infrared radiation performance of such materials. We synthesized DyTa₃O₉ ceramics with different Ca $^{2 +}$ $^{2 +}$ doping concentrations using the solid-phase reaction method and systematically investigated the effect of doping concentration on the infrared emissivity of DyTa₃O₉ ceramics. When Ca $^{2 +}$ $^{2 +}$ is doped into the DyTa₃O₉ lattice, the original Dy elements are replaced by Ca, resulting in an increase in lattice constants and enhanced lattice distortion. The doping of Ca $^{2 +}$ $^{2 +}$ introduces impurity energy levels, making it possible for some low-energy electron transitions, achieving an enhancement in infrared absorption and emission capabilities. When the Ca $^{2 +}$ $^{2 +}$ doping concentration reaches 7.5% mol, the average infrared emissivity in the 3–5 $μ$ $μ$ m and 8–12 $μ$ $μ$ m ranges are 0.85 and 0.92, respectively, representing a 19.7% and 21% increase compared to DyTa₃O₉. This novel high-infrared-emissivity ceramic holds great potential for applications in high-temperature energy conservation and aerospace thermal protection.

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