Abstract
Diamond synthesis from graphite with catalysts was tried at various temperatures and pressures. The diamond formation regions were determined by the press load and the temperature of samples measured with thermocouples. By comparing the diamond formation regions with thermodynamically calculated diamond-graphite equilibrium curve, the conical belt high pressure apparatus which was used in the present study was calibrated at high temperature. There are two differences between the resultant line and the calibration line which was determined by using Bi as a calibrant at room temperature; (1) the pressure loss at high temperature is greater than that at room temperature, (2) the slopes of the calibration lines at high temperature are greater than that at room temperature. These differences may be affected by the difference of the sample environments between high temperature and room temperature. The calibration of pressure based on the diamond-graphite equilibrium curve is exact at high temperature.
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