The solid state magnetic cooling (MC) method by utilizing the magnetocaloric effect (MCE) has been recognized as an environmentally friendly and energy efficiency technology. A huge gap between the developing of MCE materials and the practical MC applications still exists at present. In this work, a combination theoretical and experimental investigation of the Sr₂GdNbO₆ compound with a typical orthorhombic double perovskite (DP) type structure in terms of structural, magnetic and MCE properties have been reported. Ferromagnetic (FM) interaction with large magnetic moment at ground state has been confirmed in Sr₂GdNbO₆ DP compound. Excellent MCE performances at cryogenic have been realized in Sr₂GdNbO₆ DP compound which is accompanied by a second-ordered type magnetic transition from paramagnetic to FM state. The observed large MCE parameters make the Sr₂GdNbO₆ DP compound attractive for practical cryogenic MC applications.

利用磁热效应 (MCE) 的固态磁冷却 (MC) 方法已被公认为是一种环保节能技术。目前，MCE材料的开发与实际MC应用之间仍然存在巨大差距。在这项工作中，已经报道了在结构、磁性和 MCE 性能方面具有典型斜方双钙钛矿 (DP) 型结构的 Sr ₂ GdNbO ₆化合物的理论和实验研究。已在 Sr ₂ GdNbO ₆ DP 化合物中证实了在基态具有大磁矩的铁磁 (FM) 相互作用。在 Sr ₂ GdNbO 中实现了出色的低温 MCE 性能₆ DP 化合物，伴随着从顺磁态到 FM 态的二阶型磁跃迁。观察到的大 MCE 参数使 Sr ₂ GdNbO ₆ DP 化合物对实际低温 MC 应用具有吸引力。