过剩压晶种法生长金刚石过程中的浮力效应及其影响  

EFFECT OF BUOYANT FORCE AND ITS INFLUECE ON THE PROCESS OF GEOWING DIAMOND BY THE EXCESS PRESSURE SEED METHOD

作　　者：罗伯诚[1] 罗湘捷[2] 张欣苑[3] 李祝[3] 丁立业[2] 

机构地区：[1]四川大学原子核科学与技术研究所,成都610064 [2]四川大学高温高压物理研究所,成都610065 [3]四川大学分析测试中心,成都610065

出　　处：《高压物理学报》1999年第4期301-306,共6页Chinese Journal of High Pressure Physics

摘　　要：在合成金刚石的“过剩压晶种法”中,通过适当设计合成腔组装、晶种植种方式及位置、合成条件的选择,观察到在高温高压条件下,晶种在熔化金属触媒中上浮并生长的现象。这一现象是金属与金刚石比重不同而引起的。实验发现,晶种上浮现象与合成条件有密切的关系,适当高的温度与压力是必要的。浮力效应对过剩压晶种法中,金刚石的连聚晶形成及晶体形态,都有一定的影响。In“Excess Pressure Seed Method'of synthesis diamond,we have observed the phenomenon that crystal seed grew floating up in the melting metal solvent under high temperature and high pressure by appropriate designing the composite cavity assembly,designing the way and the location of crystal seed plant and selecting of composite condition.The phenomenon is caused by the difference of specific gravity between metal and carbon.In the experiment,a close relation is shown between the crystal seed floating up phenomenon and the composite condition.An appropriately high temperature and pressure and necessary.The effect of buoyance has some influence on the formation of the diamond polycrystalline and crystal shape in excess pressure seed method. Key words: diamond;excess pressure;crystal seed;effect of the buoyancy forceavy metals in pore water of reduction phase sediments and it forms sulfide with heavy metals again,and effects the chemical species of heavy metals in sediments.Study has been proven to be the dominant phase AVS reacting with heavy metals.Change of AVS can occur either through human activities,such as dredging waterways and harbors,or by natural phenoment,such as resuspension due to storms and changes in sediment Chemistry.The study passed a series of laboratory aeration experiments for 32 days,effect of probe the change of sulfide content on lead.The result shows that aeration of sediments results in rapid decrease of the (AVS).At the same time,distinct changes also occurred in the values of Pb, E h,DO,and pH.

关 键 词：金刚石 生长过程 过剩压 晶种法 浮力效应 

分 类 号：O613.71[理学—无机化学]