摘要
The crystal structure and phase relations of the Pr2Fe14B-La2Fe14B system were investigated by X-ray powder diffraction （XRD）, differential scanning calorimetry （DSC） and scanning electron microscopy （SEM） equipped with energy dispersive X-ray spectroscopy （EDS）. The crystal structure parameters were determined by full-profile Rietveld refinements. The results revealed that all alloys of （Pr1–xLax）2Fe14B crystallized the Nd2Fe14B-type structure with the space groupP42/mnm and formed a continuous solid solutions betweenx=0.0 and 1.0. The lattice parametera,c, unit-cell volumeVand c/a ratio increased linearly with the La concentra-tion. Determined by thermogravimetry analysis, the Curie temperature （TC）, phase transition temperature and melting temperature of （Pr1–xLax）2Fe14B decreased linearly upon the La content. Based on the results of DSC measurements and X-ray powder diffraction examinations, the phase diagram of the Pr2Fe14B-La2Fe14B system was built up.
The crystal structure and phase relations of the Pr2Fe14B-La2Fe14B system were investigated by X-ray powder diffraction （XRD）, differential scanning calorimetry （DSC） and scanning electron microscopy （SEM） equipped with energy dispersive X-ray spectroscopy （EDS）. The crystal structure parameters were determined by full-profile Rietveld refinements. The results revealed that all alloys of （Pr1–xLax）2Fe14B crystallized the Nd2Fe14B-type structure with the space groupP42/mnm and formed a continuous solid solutions betweenx=0.0 and 1.0. The lattice parametera,c, unit-cell volumeVand c/a ratio increased linearly with the La concentra-tion. Determined by thermogravimetry analysis, the Curie temperature （TC）, phase transition temperature and melting temperature of （Pr1–xLax）2Fe14B decreased linearly upon the La content. Based on the results of DSC measurements and X-ray powder diffraction examinations, the phase diagram of the Pr2Fe14B-La2Fe14B system was built up.
基金
supported by the National Basic Research Program of China(2014CB643703)
National Key Research and Development Program of China(2016YFB0700901)
National Natural Science Foundation of China(51161004,51371061)
Guangxi Natural Science Foundation(2014GXNSFAA118334,2014GXNSFAA118317,YB1512)
