论文部分内容阅读
本文用两种差热分析方法即“一步法”和“二步法”以及多晶X-射线衍射法对镓-镁二元系相图进行了研究.修正了前人的工作. 为了考察该二元体系的金属间化合物是否以镓原子多面体簇状结构存在,作者对富镓部分相图(镓原子百分含量大于71.4％)进行了较为细致的研究.在三种不同比例下(含镓量分别为85at.％、90at.％、95at.％)合成,分离得到了颗粒状晶体.对这些晶体进行了差热分析和多晶X-射线研究.分析结果表明:从这三种不同比例的合金中分离得到的晶体为同一金属间化合物Mg_2Ga_5,也是该二元系镓含量最高的金属间化合物.考察Ga-Mg体系中存在的五种金属间化合物的结构,未能发现镓原子以多面体簇状结构存在的现象.
In this paper, two kinds of differential thermal analysis methods, one-step and two-step methods, and polycrystalline X-ray diffraction were used to study the phase diagram of gallium-magnesium binary system.Modify the previous work.In order to investigate the The binary system of intermetallic compounds exist as gallium atom polyhedron cluster structure, the author of the gallium rich part of the phase diagram (gallium atomic percentage greater than 71.4%) conducted a more detailed study in three different proportions (including gallium The content was 85at.%, 90at.%, 95at.%) Were synthesized, isolated and granular crystals were obtained. Differential thermal analysis of these crystals and polycrystalline X-ray studies were carried out.The results show that: from these three different ratios Of the alloy obtained for the same intermetallic compound Mg_2Ga_5, is also the binary gallium content of the highest intermetallic compounds.Check Ga-Mg system of five intermetallic compounds in the structure, failed to find gallium atoms to polyhedron Clustered structure of the phenomenon.