Li Yuwei, Hu Xiukun, Wu Qiong, Zhao Yi, Yang Hangfu, Pan Minxiang, Ge Hongliang
Magnetism Key Laboratory of Zhejiang Province, China Jiliang University, Hangzhou 310018, China.
Hangzhou Quadrant Technology Co., Ltd., Hangzhou 311500, China.
Materials (Basel). 2025 Jun 18;18(12):2884. doi: 10.3390/ma18122884.
This study systematically investigates the magnetic ordering and magnetocaloric properties of a series of polycrystalline compounds, GdDyScO (x = 0, 0.1, 0.2 and 1). X-ray powder diffraction (XRD) analysis confirms that all samples exhibit an orthorhombic perovskite structure with a space group of Pbnm. The zero-field cooling and field cooling magnetization curves demonstrate a transition from antiferromagnetic to paramagnetic phases, with Néel temperatures of about 3 K for GdScO and 4 K for DyScO. The doping of Dy weakened long-range antiferromagnetic order and enhanced short-range magnetic disorder in GdScO, leading to vanished antiferromagnetic transition between 2 and 100 K for the sample of x = 0.2. Using the Arrott-Noakes equation, we constructed Arrott plots to analyze the system's critical behavior. Both the compounds with x = 0.1 and x = 0.2 conform to the 3D-Heisenberg model. These results indicate the weakened long-range antiferromagnetic order induced by Dy doping. Significant maximal magnetic entropy change (-ΔSMMax) of 36.03 J/kg K at 3 K for the sample GdDyScO is achieved as the magnetic field changes from 0 to 50 kOe, which is higher than that of GdScO (-ΔSMMax = 34.32 J/kg K) and DyScO (-ΔSMMax = 15.63 J/kg K). The considerable magnetocaloric effects (MCEs) suggest that these compounds can be used in the development of low-temperature magnetic refrigeration materials.
本研究系统地研究了一系列多晶化合物GdDyScO（x = 0、0.1、0.2和1）的磁有序和磁热性能。X射线粉末衍射（XRD）分析证实，所有样品均呈现正交钙钛矿结构，空间群为Pbnm。零场冷却和场冷却磁化曲线表明从反铁磁相到顺磁相的转变，GdScO的奈尔温度约为3 K，DyScO的奈尔温度约为4 K。Dy的掺杂削弱了GdScO中的长程反铁磁有序并增强了短程磁无序，导致x = 0.2的样品在2至100 K之间的反铁磁转变消失。使用阿罗特-诺克斯方程，我们构建了阿罗特图来分析系统的临界行为。x = 0.1和x = 0.2的化合物均符合三维海森堡模型。这些结果表明Dy掺杂导致长程反铁磁有序减弱。当磁场从0变化到50 kOe时，样品GdDyScO在3 K时实现了36.03 J/kg K的显著最大磁熵变（-ΔSMMax），高于GdScO（-ΔSMMax = 34.32 J/kg K）和DyScO（-ΔSMMax = 15.63 J/kg K）。可观的磁热效应（MCE）表明这些化合物可用于低温磁制冷材料的开发。
