Experimental methods for the high temperature and high pressure study with the use of the diamond anvil cell

There are two different methods for heating sample crystal in the pressurized diamond anvil cell; laser-beam heating method and resistance heater method. The laser beam method is able to heat the -crytal higher than 1500°C but the controlling and the measuring the crystal temperature have less accuracy. This method has many difficulty on the application for the X-ray diffraction experiments. On the resistance heater method, the maximum temperature can be obtained is less than 700°C but the temperature control is easier and has higher accuracy. However, one technical difficulty commonly observed on this method is the gradual decrease of the sample pressure above the temperature of 200°C. This difficulty may be solved by the application of the spring coil or Belleville washer on the pressurizing bolt of the diamond anvil cell.