APPLICATION OF SIX-PUNCH HIGH-PRESSURE APPARATUS FOR GROWTH IB TYPE DIAMOND SINGLE CRYSTALS FOR THE PURPOSE OF MANUFACTURING PLATES WITH AN AREA OF 80 – 100 MM2
Abstract
Methods for obtaining structurally perfect diamond single crystals, which in shape and size allow the manufacture of diamond plates with an area of up to 100 mm2 and their further use as initiators of CVD crystallization of diamond surfaces, have been investigated.
Growth cells have been developed to obtain large-volume single-crystal samples by HTNR crystallization in the thermodynamic stability region; the compositions of growth systems have been optimized to obtain type Ib crystals based on Fe-Ni, Fe-Co, and Fe-Co-Mg solvents.
Methods have been developed for performing mechanical splitting, sawing, and grinding operations depending on the crystal habit shape, the presence and location of structural defects; their use was tested for the manufacture of plates of the required shape and crystallographic orientation with the aim of using them as initiating substrates for CVD processes of diamond crystallization.
The results of the research carried out as a result of the work should be applied to CVD carbon deposition to obtain diamond surfaces for use as crystallization initiators in the production of films.
Keywords: diamond, single crystal, growth rate, kinetics, crystallization, impurities, defects, diamond plates, CVD processes.
