The rare earth (RE) based alloys or compounds with excellent cryogenic magnetocaloric performance have received much research interest recently due to their potential applications of environmental friend magnetic refrigeration (MR) technology. Herein, three ternary RE-based carbide compounds RE₂Cr₂C₃ (RE = Er, Ho, and Dy) were synthesized, an investigation of combined experimental and theoretical has been performed with regard to crystal structure, magnetic properties, magnetic phase transition as well as the magnetocaloric effect (MCE) and magnetocaloric performance. All the RE₂Cr₂C₃ carbide compounds are crystallized in the orthorhombic type crystal structure (C12/m1 space group). The magnetic ground state was confirmed to be ferromagnetic (FM) for Er₂Cr₂C₃, whereas antiferromagnetic (AFM) for Ho₂Cr₂C₃ and Dy₂Cr₂C₃ compounds by density functional theory calculation in addition to experimental observation. Large cryogenic MCE has been observed with the maximum isothermal magnetic entropy change (-ΔS_M^max) of 15.20, 13.98 and 9.04 J/kgK for Er₂Cr₂C, Ho₂Cr₂C₃ and Dy₂Cr₂C₃ under the magnetic field change (ΔH) of 0–5 T, respectively. Additionally, low field table-like MCE has been achieved in the Er₂Cr₂C₃/Ho₂Cr₂C₃ composites, which is benefit for active applications. These results assess and highlight the potential applicative interest of RE₂Cr₂C₃ carbide compounds in the field of cryogenic MR.

具有优异低温磁热性能的稀土( RE )基合金或化合物由于其在环境友好型磁制冷(MR)技术方面的潜在应用，近年来受到了广泛的研究关注。本文合成了三种三元稀土基碳化物化合物RE ₂ Cr ₂ C ₃ ( RE  = Er、Ho和Dy)，对晶体结构、磁性能、磁相变进行了实验和理论相结合的研究。以及磁热效应（MCE）和磁热性能。所有RE ₂ Cr ₂ C ₃碳化物化合物以斜方晶型晶体结构（C 12/ m 1 空间群）结晶。_{Er 2} Cr ₂ C ₃的磁性基态为铁磁性 (FM) ，而 Ho ₂ Cr ₂ C ₃和 Dy ₂ Cr ₂ C ₃化合物的磁性基态为反铁磁性 (AFM)，除实验观察外，还通过密度泛函理论计算. 已观察到大型低温 MCE ，对于 Er ₂ Cr ，最大等温磁熵变化 (-Δ S _M ^max ) 分别为 15.20、13.98 和 9.04 J/kgK₂ C、Ho ₂ Cr ₂ C ₃和Dy ₂ Cr ₂ C ₃分别在0-5 T的磁场变化（ΔH）下。_{此外，在 Er 2} Cr ₂ C ₃ /Ho ₂ Cr ₂ C ₃复合材料中实现了低场表状 MCE ，这有利于主动应用。这些结果评估并突出了RE ₂ Cr ₂ C ₃碳化物化合物在低温 MR 领域的潜在应用兴趣。