摘要
Abstract
The impurities in a series of abrasive diamonds synthesized by using iron and nickel alloy as catalyst,ranging from low grade to high grade,were investigated by employing magnetic susceptibility tester,SEM/EDS and oxygen nitrogen analyzer.The results show that magnetic susceptibility of synthetic diamond is proportional to the mass ratio of the diamond ash and the diamond itself.The main impurities in the synthetic diamond are iron, nickel, magnesium, silicon, calcium, oxygen and nitrogen.With the decrease of the total amount of impurities in the diamond,all of the impurities except for nitrogen decrease,but share of silicon and calcium increase.This fact implies that there may be another way for silicon and calcium get into the diamond lattice in addition to accompanying metal inclusions.The higher the diamond grade the lower the oxygen mass fraction,while the nitrogen mass fraction shows no relationship with diamond grade.To further investigate the origin of impurities in the diamond,the graphite and catalyst used for synthesizing the diamond were analyzed,too.Using of high-purity graphite and catalyst may contribute to the synthesis of high purity diamond,but not necessarily the top diamond.关键词
金刚石/杂质/磁化率/金刚石灰分Key words
diamond/impurity/magnetic susceptibility/diamond ash分类
化学化工
