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Effect of doping concentration and heat treatment on the refrigerant capacity of Pr0.63Dy0.37-xSrxMnO3
Current Applied Physics ( IF 2.4 ) Pub Date : 2021-05-11 , DOI: 10.1016/j.cap.2021.04.021
Riheb Hamdi , Yousef Haik , Saleh S. Hayek , Ayman Samara , Said A. Mansour

Based on the evolution of the quantity of Sr in Pr0.63Dy0.37-xSrxMnO3 (x = 0.00 and x = 0.30) systems and the different heat treatments (500, 800 and 1300 °C), various physical changes are illustrated by these samples. X-ray diffraction patterns were carried out revealing that the heat temperature can affect the structure of the systems.

Zero-Field-Cooled and Field-Cooled magnetizations revealed the appearance of different magnetic transitions; from the paramagnetic state to the antiferromagnetic one. Once increasing the temperature of heat up to 1300 °C and for x = 0.30, the system presents a ferromagnetic order at Curie temperature that is around 200 K. Magnetic hysteresis loops confirm the transitions presented by the magnetic measurements.

The heating temperature affected also the evolution of the magnetic entropy change. All samples show an important increase in the data values of the maximum of the magnetic entropy change while augmenting the applied magnetic field. We note an important result that is the refrigerant capacity of the x = 0.30 sample heated at 1300 °C is 725% compared to that at 500 °C.



中文翻译:

掺杂浓度和热处理对Pr 0.63 Dy 0.37-x Sr x MnO 3制冷剂容量的影响

基于Pr 0.63 Dy 0.37-x Sr x MnO 3(x = 0.00和x = 0.30)系统中Sr量的演变以及不同的热处理(500、800和1300°C),可以说明各种物理变化通过这些样本。X射线衍射图谱显示出加热温度会影响系统的结构。

零磁场冷却和磁场冷却的磁化强度显示出不同的磁跃迁。从顺磁状态到反铁磁状态。一旦将加热温度提高到1300°C,并且x = 0.30,系统就会在居里温度下显示大约200 K的铁磁阶。磁滞回线确认了磁测量所呈现的跃迁。

加热温度也影响了磁熵变的演变。所有样本都显示出在增加所施加的磁场的同时,磁熵变最大值的数据值有重要增加。我们注意到一个重要的结果,即与在500°C时相比,在1300°C下加热的x = 0.30样品的制冷量为725%。

更新日期:2021-05-15
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