The composition of the fluid phase in inclusions in synthetic HPHT diamonds grown in system Fe-Ni-Ti-C.

ABSTRACT: Diamonds grown by high pressure high temperature process (HPHT) are usually characterized by yellow color and high contents of nitrogen. Introduction of Ti decreases nitrogen content in diamond. Understanding the formation of nitrogen-poor diamond is very important not for the progress of HPHT process only, but because these diamond varieties represent the rare natural stones, although their crystallization conditions have not been clarified yet. Here we studied the composition of fluid phase in synthetic diamonds. The experiments were performed using a high-pressure apparatus BARS at pressures 5.5-6.0 GPa and temperatures 1350-1400 °C. It was found that introduction of metallic Ti leads to concentration of nitrogen mainly as nitrogenated hydrocarbons. The hypothesis that elucidates the fo

SUBMITTER: Sonin V 

PROVIDER: S-EPMC8786936 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature