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Article Abstract
In this experiment, a series of MnCoGeLa (x = 0, 0.01, 0.03) alloy samples were prepared using a vacuum arc melting method. The crystal structure and magnetic properties of alloys were investigated using X-ray diffraction (XRD), Rietveld method, physical property measurement system (PPMS), and vibrating sample magnetometer (VSM) analyses. The results show that all samples were of high-temperature NiIn-type phases, belonging to space group P6/mmc (194) after 1373 K annealing. The results of Rietveld refinement revealed that the lattice constant and the volume of MnCoGeLa increased along with the values of La constants. The magnetic measurement results show that the Curie temperatures (T) of the MnCoGeLa series alloys were 294, 281, and 278 K, respectively. The maximum magnetic entropy changes at 1.5T were 1.64, 1.53, and 1.56 J·kg·K, respectively. The respective refrigeration capacities (RC) were 60.68, 59.28, and 57.72J·kg, with a slight decrease along the series. The experimental results show that the doping of La results in decreased T, basically unchanged magnetic entropy, and slightly decreased RC.
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| http://dx.doi.org/10.3390/ma14143998 | DOI Listing |
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