Title

STABILIZATION OF DIAMOND SYNTHESIS AT HIGH PRESSURE AND TEMPERATURE

STABILIZATION OF DIAMOND SYNTHESIS AT HIGH PRESSURE AND TEMPERATURE

Authorship

POTEMKIN, A.A.; POLIAKOV, V.P.

POTEMKIN, A.A.

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POLIAKOV, V.P.

I am this author

DOI

10.5151/2594-5327-C00053-806-812

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Abstract

The basic problem, arising at synthesis of diamond single crystals in conditions of high pressure and temperatures is non-controllable pressure fall, occurring as result of various phase transitions in the high pressure cell. If fall of pressure is significant it worsens quality of synthesized crystals and even can result in an exit of system from area of diamond stability and termination of process of synthesis. In this work with the purpose to stabilize the process of diamond single crystals synthesis the special inserts, produced by compacting of zirconium oxide and sodium chloride powders, preventing phase transitions in a material of a cell at high pressure and temperature, and also the previously sintered metal-catalyst were used. The kinetics measurements of pressure change in a typical reactive cell have shown that the reduction of pressure can reach 0.13GPa/min. The application of inserts and previously sintered catalyst has allowed to reduce fall of pressure in a reactionary cell up to 0.02GPa/min, and also to raise yield of high quality diamond crystals.

The basic problem, arising at synthesis of diamond single crystals in conditions of high pressure and temperatures is non-controllable pressure fall, occurring as result of various phase transitions in the high pressure cell. If fall of pressure is significant it worsens quality of synthesized crystals and even can result in an exit of system from area of diamond stability and termination of process of synthesis. In this work with the purpose to stabilize the process of diamond single crystals synthesis the special inserts, produced by compacting of zirconium oxide and sodium chloride powders, preventing phase transitions in a material of a cell at high pressure and temperature, and also the previously sintered metal-catalyst were used. The kinetics measurements of pressure change in a typical reactive cell have shown that the reduction of pressure can reach 0.13GPa/min. The application of inserts and previously sintered catalyst has allowed to reduce fall of pressure in a reactionary cell up to 0.02GPa/min, and also to raise yield of high quality diamond crystals.

Keywords

high pressure, stabilization, diamond synthesis

high pressure, stabilization, diamond synthesis