Novel gadolinium garnet Gd3Te2Li3O12: Magnetism and magnetocaloric performance for sub-kelvin cryogenic applications

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-05-22 DOI:10.1039/d5dt00989h

Xuetong He, Lu Tian, Jianjian Gong, Zhaojun Mo, Xinqiang Gao, Guodong Liu

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Abstract

The global helium shortage and escalating costs in cryogenic engineering have intensified demands for helium-free refrigeration technologies. Adiabatic demagnetization refrigeration (ADR) based on the magnetocaloric effect (MCE) presents a viable solution, with its efficacy fundamentally dependent on advanced magnetocaloric materials. Here we present the successful synthesis of a novel gadolinium garnet Gd3Te2Li3O12 through solid-state reaction, which crystallizes in the cubic Ia-3d space group. The integration of magnetic characterization results with density functional theory (DFT) calculations establishes Gd3Te2Li3O12 as an antiferromagnetic compound exhibiting ultra-low magnetic ordering below 0.4 K. A comprehensive evaluation of the sub-kelvin magnetocaloric parameters demonstrates advantageous characteristics compared to commercial gadolinium gallium garnet (GGG) benchmarks, featuring both reduced magnetic ordering temperature and optimized entropy variation in the sub-Kelvin regime. These metrics position Gd3Te2Li3O12 as a prime candidate for sub-Kelvin ADR systems, while the observed geometrically frustrated magnetic sublattice configuration suggests new design principles for next generation magnetocaloric materials.

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新型钆石榴石Gd3Te2Li3O12：亚开尔文低温应用的磁性和磁热性能

全球氦气短缺和低温工程成本的不断上升，加大了对无氦制冷技术的需求。基于磁热效应（MCE）的绝热退磁制冷（ADR）是一种可行的解决方案，其效果从根本上依赖于先进的磁热效应材料。本文通过固相反应成功合成了一种新型钆石榴石Gd3Te2Li3O12，该石榴石在立方Ia-3d空间群中结晶。磁性表征结果与密度泛函理论（DFT）计算相结合，确定了Gd3Te2Li3O12为一种在0.4 K以下表现出超低磁有序的反铁磁性化合物。对亚开尔文磁热参数的综合评估显示，与商业钆镓石榴石（GGG）基准相比，具有降低磁有序温度和优化亚开尔文状态下熵变化的优势。这些指标将Gd3Te2Li3O12定位为亚开尔文ADR系统的主要候选者，而观察到的几何受挫磁亚晶格结构为下一代磁热材料提供了新的设计原则。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.