Magnetocaloric Effect of Fe(Rh1−xPdx) Alloys
Magnetocaloric Effect of Fe(Rh1−xPdx) Alloys
复制标题
Fe(Rh1−xPdx) 合金的磁热效应
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Mori
中科院分区：
文献类型：
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作者：
K. Nishimura;Y. Nakazawa;Lingwei Li;K. Mori
用电阻率、磁化强度、比热和直接测量绝热温变AT的方法研究了x=0.0、0.0 1、0.0 3、0.0 6、0.0 7、0.0 8和0.0 9的Fe4 9(Rh1-xPdx)5 1合金的磁热效应。磁化强度测量给出了所有样品的等温磁熵变实验值。反铁磁-铁磁转变的临界温度很大程度上取决于Pd的取代浓度。Fe-49(Rh-0.97Pd-0.03)51的ΔB=0~7T，在室温下观察到一个宽达1.7J·mol-1K-1和约90K的宽峰。Fe49(Rh0.97Pd0.03)51的比热数据使估算各种外场的AT值成为可能。AT的这个估计值与使用热电偶直接测量的值相比较很好。
Magnetocaloric effects of Fe 49 (Rh 1-x Pd x ) 51 alloys with x = 0.0, 0.01, 0.03, 0.06, 0.07, 0.08, and 0.09, were investigated using resistivity, magnetization, specific heat, and direct measurement of the adiabatic temperature change AT. Magnetization measurements yielded experimental values of the isothermal magnetic-entropy change AS for all the samples. The critical temperature of the anitiferromagnetic-ferromagnetic transition was found to depend largely on the substitution concentrations of Pd. A broad peak in AS, up to 1.7 J·mol -1 K -1 and some 90 K broad around room temperature, was observed with a field change of ΔB = 0 to 7 T for Fe 49 (Rh 0.97 Pd 0.03 ) 51 . The specific heat data of Fe 49 (Rh 0.97 Pd 0.03 ) 51 made it possible to estimate the AT values for various external fields. This estimated value of AT compares well with the value measured directly using a thermocouple.