Wlodarczyk Patryk, Hawelek Lukasz, Kowalczyk Maciej, Kaminska Malgorzata, Polak Marcin, Hudecki Andrzej, Kolano-Burian Aleksandra
Sowinskiego 5, 44-100 Gliwice, Poland.
Faculty of Materials Science and Engineering, Warsaw University of Technology, ul. Woloska 141, 02-507 Warsaw, Poland.
Materials (Basel). 2017 May 13;10(5):529. doi: 10.3390/ma10050529.
Intermetallic compounds with the overall formula MnFePAsGe ( varies from 0 to 0.1) were investigated in order to study their magnetocaloric effect by monitoring the adiabatic temperature change, magnetic entropy change and their relation to structural parameters. It was found that the maximum of magnetocaloric effect was achieved for = 0.02. Adiabatic temperature change for consolidated powder was equal to 2.75 K for the magnetic field change ΔB = 1.7 T for the sample with = 0.02. For the pure non-doped sample, this parameter is much lower: ΔT = 1.7 K @ ΔB = 1.7 T. This result was correlated with the change of structural parameters such as lattice constants and the unit cell volume.
研究了通式为MnFePAsGe（其中Ge的含量从0到0.1不等）的金属间化合物，通过监测绝热温度变化、磁熵变化及其与结构参数的关系来研究它们的磁热效应。结果发现，当Ge含量为0.02时，磁热效应达到最大值。对于Ge含量为0.02的样品，在磁场变化ΔB = 1.7 T时，固结粉末的绝热温度变化等于2.75 K。对于纯未掺杂样品，该参数要低得多：在ΔB = 1.7 T时，ΔT = 1.7 K。该结果与晶格常数和晶胞体积等结构参数的变化相关。
