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The Ce-Sn-Zn alloys were prepared by furnace melting. The isothermal section of the Ce-Sn-Zn system at 400 oC over the whole composition range was established by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). A new ternary compound, CeSn 2 Zn 2 , was discovered in the present work. This compound adopted CaBe 2 Ge 2 structure type (space group P4/nmm) with the lattice parameters of a=0.4455 (9) nm and c=1.0348 (1) nm. The existence of previously known ternary compounds, CeSnZn and Ce 2 SnZn 3 , were confirmed, too. The maximum solubility of Zn in CeSn 3 was determined to be 12.7 at.%. 相似文献
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招标采购作为一种科学高效的方式已被高校设备购置广泛采用,本文从合理定制采购预算,确定设备技术性能参数、透明化采购过程、合同签订及履行等几个方面浅析了高校仪器设备在采购过程中需注意的问题,并对采购人员素质和能力提出了要求。 相似文献
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