【摘要】 系统地研究了不同反应容器材料在高温高压下的长时间物理化学稳定性。采用1000℃烧结的纯叶蜡石管,叶蜡石氧化镁混合管与石英管做反应容器材料,分别进行了宝石级金刚石的合成研究。结果表明用1000℃烧结纯叶蜡石管和叶蜡石氧化镁混合管做反应容器材料在恒功率加热的合成过程中,加热电压一直存在上升趋势,不适合用作优质宝石级金刚石单晶生长的反应容器材料。高温高压下完全柯石英化的国产石英管稳定性好,强于高温(1000℃)焙烧过纯叶蜡石和叶蜡石和氧化镁混合材料,而且石英管做反应容器材料生长出的宝石级金刚石单晶晶面完整,显微镜下几乎没有发现包裹体和缺陷,这说明国产石英管适合做宝石级金刚石单晶合成用的反应容器材料。更多还原

【Abstract】 The physical and chemical stability of different reaction-cell container material under HPHT is (systematically ) studied. The synthesis experiments of growing gem diamond are carried out with three kinds of (reaction)-cell container, namely pure pyrophyllite tube sintered under 1000℃, powder-mixture tube of (pyrophyllite) and MgO, and quartz tube. With pure pyrophyllite tube sintered under 1000℃, powder-mixture tube of pyrophyllite and MgO as container, the heating voltage is always increasing, although constant power heating ways is used. So, it is concluded that, as the cell container, they are not fit for growing high-purity gem diamond. When transformed into coesite completely, the quartz tubes are more stable than pure pyrophyllite or pyrophyllite-containing mixture sintered under high temperature. And the surfaces of crystals grown with the quartz tube are perfact, and there is almost no any inclusion or defect in the crystals. Therefore, it is concluded that quartz tubes are fit for high-purity gem diamond.更多还原