Huiqin Yun, Ze Li, Xiang Jin, Jianjun Zhao, Jingshun Liu
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引用次数: 0
摘要
本研究采用高温固相反应法制备了 Pr2Mn2O6(母相)和 Pr1.5A0.5Mn2O6(A = Mg、Ba)的多晶样品。系统研究了掺杂镁和钡对母相的磁致性和临界行为的影响。在 7 T 的磁场下,Pr2Mn2O6、Pr1.5Mg0.5Mn2O6 和 Pr1.5Ba0.5Mn2O6 的相对冷却功率 (RCP) 值分别约为 483.46 J-kg-1、428.22 J-kg-1 和 479.88 J-kg-1。临界行为分析表明,母相表现出短程交换相互作用,而 Pr1.5A0.5Mn2O6 (A = Mg、Ba)则表现出长程交换相互作用。研究了不同磁场下有序参数 n 的温度依赖性,证实了相变类型,并验证了所得临界指数的准确性。研究结果表明,母相和 A 位掺钡陶瓷都有望成为磁制冷材料。
Study of the Magnetocaloric Effect and Critical Behavior in Double Perovskite Manganese Oxides Pr1.5A0.5Mn2O6 (A = Mg, Ba)
In this study, polycrystalline samples of Pr2Mn2O6 (parent phase) and Pr1.5A0.5Mn2O6 (A = Mg, Ba) were prepared using the high-temperature solid-phase reaction method. The effects of Mg and Ba doping on magnetocaloric properties and critical behavior of the parent phase were systematically investigated. Under a magnetic field of 7 T, the relative cooling power (RCP) values of Pr2Mn2O6, Pr1.5Mg0.5Mn2O6, and Pr1.5Ba0.5Mn2O6 were approximately 483.46 J·kg−1, 428.22 J·kg−1, and 479.88 J·kg−1, respectively. The critical behavior analysis revealed that the parent phase showed short-range exchange interactions, while Pr1.5A0.5Mn2O6 (A = Mg, Ba) exhibited long-range exchange interactions. The temperature dependence of the order parameter n was studied under different magnetic fields, confirming the phase transition types and validating the accuracy of the critical exponents obtained. The research findings suggest that both the parent phase and Ba-doped ceramics at the A-site hold promise as magnetic refrigeration materials.
期刊介绍:
The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.