Skip to main content

Figure 21

This graph shows the pressure and temperature stability fields for graphite and diamond, the polymorphs of carbon.

The vertical axis denotes pressure in gigapascals, from 0 at the bottom left, to 9 at the top left.

The horizontal axis denotes temperature in degrees Celsius from 0 at the bottom left to almost 4000 at the bottom right.

The stability fields for diamond and graphite are separated by a diagonal line running from 0 °C and 1.5 gigapascals on the left, to 2800 °C and 9 gigapascals on the right.

Diamond is stable above this line and graphite is stable below it.

 4.3 Covalent structures and bonding