According to the phase diagram of carbon, what pressure and temperature conditions, if any, are needed in order for diamond to be the stable phase?
A) low pressure, low temperature
B) low pressure, high temperature
C) high pressure, low temperature
D) high pressure, high temperature
E) Actually, diamond is not stable under any conditions.

Question

Quizplus · Accepted Answer

According to the phase diagram of carbon, diamond is the stable phase at high pressures (more than 1.3 GPa) and low temperatures (less than 1700 K). Therefore, choice C) is the best answer.

According to the Phase Diagram of Carbon, What Pressure and Temperature