what happens when diamonds are heated to high temperature?

Answer 1

When diamonds are heated to 600 ºC in air, they develop a black coating on the surface. When heated above 800 ºC in air, diamonds combust, giving off a yellow or blue flame depending on how much oxygen is present. More air flow or higher oxygen content would give a bluer flame. If a diamond is heated in a vacuum or an inert atmosphere at 1500 ºC or higher, it reverts to a black-colored mass of graphite. In a vacuum at higher temperatures (approaching 3000 ºC), diamond will sublime at an appreciable rate.

Answer 2

Well, the first answer is correct assuming that it is heated in an atmosphere containing oxygen. If it is heated to high temeratures and exposed to any compound, chances are that you will end up with some carbon compund, because most compounds will ionize at high temperatures. When heated in an inert atmosphere, the diamond will convert to an amorphous form.

Answer 3

Diamonds sublime when heated to a high enough temperature, at standard atmospheric pressure. Carbon Dioxide solid (Dry Ice) also sublimes.

Sublimation means change phase from solid straight to gas.

So diamond turns straight to gas and disappears. Those carbon atoms that are subliming off the solid diamond are quite reactive and are likely to bond with whatever else is around - CO2 with oxygen, cyano/cyanide -CN complexes with nitrogen.

Whether the diamond actually burns/catches fire is a matter of opinion/definition.

The diamond certainly disappears.

Answer 4

Diamond is the purest form of carbon on burning it will produce CO2 gas only.

Answer 5

How high? Diamonds will urn like coal if heated high enough. before that they will crack.

Answer 6

Depends how high and if there is any pressure.
Sometimes, it may change colours, eg. pink, yellow.

Answer 7

They burn like every other form of carbon....

Answer 8

there should be nothing happened~!