X-射线粉末衍射仪(X-ray power diffractometer,XRPD)是一种非常重要的材料分析测试仪,它在许多学科和领域都有着广泛的的应用。目前在高校中,X-射线粉末衍射仪已经成为样品表征的必备仪器,其应用于科学研究的同时并逐步应用在实验教学...X-射线粉末衍射仪(X-ray power diffractometer,XRPD)是一种非常重要的材料分析测试仪,它在许多学科和领域都有着广泛的的应用。目前在高校中,X-射线粉末衍射仪已经成为样品表征的必备仪器,其应用于科学研究的同时并逐步应用在实验教学、课程改革和人才培养。该仪器在测试过程中对各种参数的设置对测试结果有很大的影响,本文以Al_2O_3粉末作为研究对象初步探究X-射线粉末衍射仪各种参数设置如电压、电流、扫描速度及扫描步长对其测试结果的影响并对各种参数进行优化。展开更多
A comparative study on the formation process of graphite oxide (GO) prepared both from natural graphite (NG) and expandable graphite (EG) was accomplished by XRD and XPS techniques. It reveals that expandable graphite...A comparative study on the formation process of graphite oxide (GO) prepared both from natural graphite (NG) and expandable graphite (EG) was accomplished by XRD and XPS techniques. It reveals that expandable graphite, a graphitic intercalated compound (GIC), can have easy access to an interlayer oxidation leading to higher extent of oxidation within shortened time interval. An XPS study on GO surface shows a complicate chemistry. Much more involved is the dominated graphitic carbon accumulated on the surface accompanied with a variety of oxygen containing functional groups along with oxidation. The bonding state in the surface is mostly in control of the single bond linkage, C O.展开更多
文摘X-射线粉末衍射仪(X-ray power diffractometer,XRPD)是一种非常重要的材料分析测试仪,它在许多学科和领域都有着广泛的的应用。目前在高校中,X-射线粉末衍射仪已经成为样品表征的必备仪器,其应用于科学研究的同时并逐步应用在实验教学、课程改革和人才培养。该仪器在测试过程中对各种参数的设置对测试结果有很大的影响,本文以Al_2O_3粉末作为研究对象初步探究X-射线粉末衍射仪各种参数设置如电压、电流、扫描速度及扫描步长对其测试结果的影响并对各种参数进行优化。
文摘A comparative study on the formation process of graphite oxide (GO) prepared both from natural graphite (NG) and expandable graphite (EG) was accomplished by XRD and XPS techniques. It reveals that expandable graphite, a graphitic intercalated compound (GIC), can have easy access to an interlayer oxidation leading to higher extent of oxidation within shortened time interval. An XPS study on GO surface shows a complicate chemistry. Much more involved is the dominated graphitic carbon accumulated on the surface accompanied with a variety of oxygen containing functional groups along with oxidation. The bonding state in the surface is mostly in control of the single bond linkage, C O.