用于低温冷却应用的 SrRE2O4（RE = Gd、Dy、Ho、Er）几何挫折氧化物的结构、磁性和磁致性表征

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-05 DOI:10.1016/j.ceramint.2024.10.042

Junli Lin , Si Wu , Kaitong Sun , Hai-Feng Li , Wang Chen , Yikun Zhang , Lingwei Li

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引用次数: 0

摘要

许多基于稀土（RE）的磁性固体的磁致冷（MC）特性已得到深入研究。本研究旨在开发适合低温冷却应用的 MC 材料，并更好地阐明其固有特性。我们制备了四种单相 SrRE2O4（RE = Gd、Dy、Ho、Er）氧化物，并对其结构、磁性和低温 MC 特性进行了系统的实验研究。所有这些 SrRE2O4 氧化物都以正交菱形结构（空间群 Pnma）结晶，并表现出典型的几何挫折。这种挫折感源于沿 c 轴的一维 RE 离子之字梯，它在 ab 平面上连接了二维蜂巢晶格。SrRE2O4 氧化物中的元素分布均匀，价态分别为 Sr2+、RE3+ 和 O2-。这些 SrRE2O4 氧化物具有很大的低温 MC 效应和显著的性能，这是由磁熵变化、制冷剂容量和温度平均熵变化（升高 5 K）等 MC 参数决定的。在 0-70 kOe 的磁场变化下，这些 MC 参数如下：SrGd2O4：34.18 J/kgK、275.88 J/kg、30.74 J/kgK；SrDy2O4：18.13 J/kgK、253.83 J/kg、17.54 J/kgK；SrHo2O4：18.81 J/kgK、354.77 J/kg、18.61 J/kgK；SrEr2O4：22.63 J/kgK、284.25 J/kg、21.97 J/kgK。这些数值与最近更新的大多数性能卓越的低温 MC 材料的数值相当，因此这些 SrRE2O4 氧化物在实际冷却应用中极具吸引力。

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Structural, magnetic, and magnetocaloric characterizations of geometrically-frustrated SrRE2O4 (RE = Gd, Dy, Ho, Er) oxides for low-temperature cooling applications

The magnetocaloric (MC) properties of many rare earth (RE)-based magnetic solids have been intensively investigated. This research aims to develop suitable MC materials for low-temperature cooling application and to better elucidate their intrinsic properties. We have fabricated four single-phase SrRE₂O₄ (RE = Gd, Dy, Ho, Er) oxides and conducted a systematic experimental investigation into their structural, magnetic, and low-temperature MC properties. All these SrRE₂O₄ oxides crystallize in an orthorhombic structure (space group Pnma) and exhibit typical geometrical frustration. This frustration arises from the one-dimensional RE ion zigzag ladders along the c-axis, which link the two-dimensional honeycomb lattice in the ab plane. The elements in SrRE₂O₄ oxides are uniformly distributed and present with valence states of Sr²⁺, RE³⁺, and O²⁻, respectively. Large low-temperature MC effects and notable performances are realized in these SrRE₂O₄ oxides, determined by the MC parameters of magnetic entropy change, refrigerant capacity, and temperature-averaged entropy change (with a lift of 5 K). These MC parameters under a magnetic field change of 0–70 kOe are as follows: 34.18 J/kgK, 275.88 J/kg, and 30.74 J/kgK for SrGd₂O₄; 18.13 J/kgK, 253.83 J/kg, and 17.54 J/kgK for SrDy₂O₄; 18.81 J/kgK, 354.77 J/kg, and 18.61 J/kgK for SrHo₂O₄; and 22.63 J/kgK, 284.25 J/kg, and 21.97 J/kgK for SrEr₂O₄. These values are comparable to those of most recently updated low-temperature MC materials with remarkable performances, making these SrRE₂O₄ oxides highly interesting for practical cooling applications.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.