磁制冷
材料科学
磁化
铁磁性
正交晶系
晶格常数
纳米颗粒
凝聚态物理
分析化学(期刊)
磁性纳米粒子
透射电子显微镜
磁场
衍射
纳米技术
结晶学
化学
晶体结构
光学
物理
量子力学
色谱法
作者
Bharati Bamana,A. R. E. Prinsloo,P. Mohanty,C. J. Sheppard
出处
期刊:AIP Advances
[American Institute of Physics]
日期:2023-02-01
卷期号:13 (2)
摘要
This work focuses on the transitions found in magnetic measurements of DyCrTiO5 nanoparticles with the associated magnetocaloric behavior. The nanoparticles have been synthesized through a fast and easy synthesis technique i.e., sol-gel method and then calcined at 800 °C. The orthorhombic structure of the material with lattice constants, a, b, and c are of 7.3158(7), 8.6431(9), 5.8390(8) Å, respectively, was established from the x-ray diffraction pattern. The transmission electron microscopy result confirms the 37 ± 1 nm particle size of the synthesised sample. The Néel temperature, TN = 153 ± 1 K, was obtained from the magnetic measurement in which magnetization (M) was measured with increasing the temperature (T). In addition, spin reorientation is observed at a temperature TSR = 49 ± 1 K. Irreversibility is seen in the field-cool-cooling curves and field-cool-warming curves of M(T) measurements at low temperatures, not previously observed in bulk samples of this material. The ferromagnetic nature, with the exchange bias effect, is confirmed for the sample from the magnetization measurements at constant temperature by varying the applied field. Additionally, a change in magnetic entropy (−ΔSm) of 10.9 ± 0.1 J kg−1 K−1 is found at a 3 T difference in the field. The obtained magnetic behavior of DyCrTiO5 nanoparticles is discussed in terms of the competing interactions of Cr3+ and Dy3+, respectively.
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