Chen Fengying, Na Yingzhe, Xie Yang, Zhang Yikun
School of Electronics and Information & Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Hangzhou Dianzi University, Hangzhou 310012, China.
ACS Appl Mater Interfaces. 2024 Oct 2;16(39):52719-52726. doi: 10.1021/acsami.4c13601. Epub 2024 Sep 18.
The magnetocaloric (MC) and magnetic phase transition (MPT) properties in various types of rare earth ()-based magnetic materials have been intensively investigated recently, which are aimed at developing suitable MC materials for low-temperature cooling applications and better elucidating their inherent physical properties. We herein provide a combined experimental and theoretical investigation into two new light -based magnetic materials, namely, PrZnSi and NdZnSi compounds, regarding their structural, magnetic, MPT, and low-temperature MC properties. Both of these compounds crystallize in an AlB-type hexagonal structure with a symmetry of the crystallographic space group / and reveal a typical second-order-type MPT with ordering temperatures () at approximately 13.5 and 18.5 K for PrZnSi and NdZnSi compounds, respectively. Moreover, they all exhibit large reversible low-temperature MC effects and remarkable performances, which are identified by the parameters of maximum magnetic entropy changes, relative cooling power, and temperature-averaged entropy change (temperature lift 5 K). The deduced values of these MC parameters under a magnetic field change of 0-7 T reach 16.3 J/kgK, 294.46 J/kg, and 15.79 J/kgK for PrZnSi and 15.4 J/kgK, 284.84 J/kg, and 14.95 J/kgK for NdZnSi, respectively, which are evidently better than those of most updated light -based magnetic materials with remarkable low-temperature MC performances, indicating that PrZnSi and NdZnSi compounds hold potentials for practical cooling applications.
最近，人们对各种类型的稀土基磁性材料的磁热（MC）和磁相变（MPT）特性进行了深入研究，目的是开发适用于低温冷却应用的MC材料，并更好地阐明其固有的物理特性。在此，我们对两种新型轻稀土基磁性材料，即PrZnSi和NdZnSi化合物，进行了实验和理论相结合的研究，涉及它们的结构、磁性、MPT和低温MC特性。这两种化合物均结晶为具有AlB型六方结构的晶体，其晶体空间群为/，并且分别在约13.5 K和18.5 K的有序温度（）下呈现出典型的二级型MPT，PrZnSi和NdZnSi化合物分别如此。此外，它们都表现出较大的可逆低温MC效应和显著的性能，这些性能通过最大磁熵变、相对冷却功率和温度平均熵变（温度升幅5 K）等参数来确定。在0 - 7 T的磁场变化下，PrZnSi的这些MC参数推导值分别达到16.3 J/kgK、294.46 J/kg和15.79 J/kgK，NdZnSi的分别为15.4 J/kgK、284.84 J/kg和14.95 J/kgK，明显优于大多数具有显著低温MC性能的最新轻稀土基磁性材料，这表明PrZnSi和NdZnSi化合物在实际冷却应用中具有潜力。
