Thermodynamical Evaluation on Magnetocaloric Effect of Magnetic Refrigerating Materials Near Room Temperature
来源期刊：JOURNAL OF RARE EARTHS2003年第6期
论文作者：杨涛 管登高 涂铭旌 肖素芬 陈云贵
Key words：condensed state physics; magnetic refrigerating materials; magnetocaloric effect; rare earths;
Abstract: The relationship between isothermal magnetic entropy change ΔS and adiabatic temperature change ΔTad was deduced according to the principles of thermodynamics. The MCE and the engineering application were discussed for Gd and several new kinds of magnetic refrigerating materials near room temperature, Gd5Si2Ge2, MnFeP0.45As0.55 and LaFe11.2Co0.7Si 1.1. Isothermal entropy change is proportional to adiabatic temperature change with a factor of T/C (T is temperature, C is heat capacity). When the comparison of magnetacoloric effect is made for two different mate rials, we should consider isothermal entropy change as well as adiabatic tempera ture change.
杨涛1，管登高1，涂铭旌1，肖素芬1，陈云贵1
(1.School of Materials Science & Engineering, Sichuan University, Chengdu 610065, China)
Abstract:The relationship between isothermal magnetic entropy change ΔS and adiabatic temperature change ΔTad was deduced according to the principles of thermodynamics. The MCE and the engineering application were discussed for Gd and several new kinds of magnetic refrigerating materials near room temperature, Gd5Si2Ge2, MnFeP0.45As0.55 and LaFe11.2Co0.7Si 1.1. Isothermal entropy change is proportional to adiabatic temperature change with a factor of T/C (T is temperature, C is heat capacity). When the comparison of magnetacoloric effect is made for two different mate rials, we should consider isothermal entropy change as well as adiabatic tempera ture change.
Key words:condensed state physics; magnetic refrigerating materials; magnetocaloric effect; rare earths;
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