Can every chemical compound be melted?

Are there any chemical compounds that disintegrate (without going into other chemical reactions; let's say in a vacuum) before reaching a melting temperature?




Some compounds decompose before they reach the melting point. In the literature, you'll see something like "m.p. $40\ ^{\circ}\mathrm{C}$ (dec.)"


[Ammonium chloride](https://en.wikipedia.org/wiki/Ammonium_chloride) is an example.


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