MgB_2烧结相变的研究

Study on Phase Transformer of MgB_2 after Sintering

对自蔓延高温合成法制备的MgB_2进行氩气保护下的烧结实验。通过X射线衍射、扫描电镜和EDX成分分析等方法,发现MgB_2在流动氩气保护下于1050℃烧结后部分转化为MgB_4。随着烧结温度提高,MgB4生成量增多。生成的MgB_4晶粒形貌与MgB2的明显不同。

MgB2 powder was synthesized by self-propagating high-temperature method, and then was pressed into green compacts, which were sintered in Ar gas to get required samptes. XRD, SEM and EDX methods analyzed the sample. It is ibund that MgB2 was partially transformed into MgB4 after sintering at 1050℃ for 1 h in At. The amount of MgB4 increased with increasing of sinter tenaperature. A part of MgB2 was decomposed into metallic Mg and amorphous B. The grain morphology of MgB4 was different with that of MgB2.