Theoretical investigation on the magnetocaloric effect in amorphous systems, application to: Gd_(80)Au_(20) and Gd_(70)Ni_(30)

E. P. Nobrega; A. Caldas; P. O. Ribeiro; B. P. Alho; T. S. T. Alvarenga; V. S. R. de Sousa; N. A. de Oliveira; P. J. von Ranke

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Theoretical investigation on the magnetocaloric effect in amorphous systems, application to: Gd_(80)Au_(20) and Gd_(70)Ni_(30)

机译：非晶系统中磁热效应的理论研究，应用于：Gd_（80）Au_（20）和Gd_（70）Ni_（30）

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The temperature dependence of the magnetocaloric effect in Gd_(80)Au_(20)and Gd_(70)Ni_(30) amorphous alloys were investigated, using the Handrich-Kobe model with a modified Brillouin function that takes an additional exchange fluctuation term. The exchange fluctuation parameters were determined to give better fits to magnetic entropy changes and adiabatic temperature changes. The magnetic entropy changes of 2.20 Jmol~(-1)K~(-1) and 1.50 Jmol~(-1)K~(-1) and the refrigerant capacity values of 135Jmol~(-1) (ΔB = 5T) and 146 Jmol~(-1) (ΔB = 7T) are obtained for Gd_(80)Au_(20) and Gd_(70)Ni_(30), respectively. In addition, the influence of phase changes between crystalline and amorphous states on the isothermal entropy change was investigated.

机译：使用具有改进的布里渊函数的Handrich-Kobe模型研究了Gd_（80）Au_（20）和Gd_（70）Ni_（30）非晶合金中磁热效应的温度依赖性，该模型采用了附加的交换波动项。确定交换波动参数以更好地适应磁熵变和绝热温度变化。磁熵变为2.20 Jmol〜（-1）K〜（-1）和1.50 Jmol〜（-1）K〜（-1），制冷剂容量值为135Jmol〜（-1）（ΔB= 5T），对于Gd_（80）Au_（20）和Gd_（70）Ni_（30）分别获得146 Jmol〜（-1）（ΔB= 7T）。另外，研究了结晶态和非晶态之间的相变对等温熵变的影响。

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《Journal of Applied Physics》 |2013年第24期|243903.1-243903.4|共4页
作者
E. P. Nobrega; A. Caldas; P. O. Ribeiro; B. P. Alho; T. S. T. Alvarenga; V. S. R. de Sousa; N. A. de Oliveira; P. J. von Ranke;
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Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

Instituto de Fisica, Universidade do Estado do Rio de Janeiro-UERJ, Rua Sao Francisco Xavier,524 20550-013 RJ, Brazil;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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Theoretical investigation on the magnetocaloric effect in amorphous systems, application to: Gd_(80)Au_(20) and Gd_(70)Ni_(30)

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