The effect of the growth rate on the concentration of nitrogen and transition metal impurities in HPHT synthetic diamonds

Topographic infrared and photoluminescence spectroscopy of synthetic single-crystal diamonds revealed that a higher growth rate increases the concentration of Ni and Co impurities in {111} growth sectors and of N impurities in {001} growth sectors. Also, the change in the concentration of Ni or Co in {111} growth sectors, caused by changing the rate of growth, of HPHT synthetic diamonds grown with Ni or Co catalysts is inversely related to the change of the concentration of N. (C) 2002 Elsevier Science B.V All rights reserved.