2:15 PM - 2:30 PM
[SIT03-01] Synthesize of boron-doped diamond cylinder as a heater in Multi-anvil apparatus
Keywords:diamond synthesize, B-doped diamond heater, ultrahigh temperature, Multi-anvil apparatus
Those cylinders have been used for extremely high temperature generation (~3000oC) in a large sample volume (~0.1mm3) in the Kawai apparatus; the sample volume is ~1000 times larger than that in diamond anvil cell. High X ray transparency of boron-doped diamond is optimum as well for in-situ synchrotron X ray analysis. Although there have been several reports on boron-doped graphite heater, the present study is the first report on pure boron-doped diamond heater in Kawai-type apparatus. The reversibility of the heater was confirmed well through three times of repeated cycle of heating and cooling. The boron-doped diamond heater with 3 wt.% boron shows metallic behavior, i.e. increasing resistance with increasing temperature. This electrical characteristic is beneficial for stably generating temperature as high as 2700oC; the heating for higher temperature was failed because of failure of electrode. Therefore, succeeding optimization is required for higher temperature generation with this new heating element. Boron-doped diamond heater is more advantageous than B-doped graphite heater, because it is free from complicated power-temperature relationship and pressure drop associated with graphite to diamond conversion.