sublimation point

Carbon also has the highest sublimation point of all elements.

For them you can have a "sublimation point", a temperature at which the solid is not stable.

Why is there a melting point after the sublimation point?

This is lower than the sublimation point of carbon dioxide (dry ice).

The sublimation point at atmospheric pressure is -84 C.

In fact, the sublimation point of caffeine is 352 degrees F, about one hundred degrees lower than the typical very dark roast.

-and varies indirectly with the boiling or sublimation point of the substance in question.'

This line indicates the combination of pressure and temperature where the solid is in equilibrium with its own gas - the system is at its sublimation point.

For such compounds, a sublimation point is a temperature at which a solid turning directly into vapor has a vapor pressure equal to the external pressure.

Some elements will go straight from a solid to a gas - i.e., no melting point and no boiling point, but, instead, a sublimation point - if they are heated under a certain range of pressures.