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Lets take an example :-

Sodium superoxide has three different crystal structure, the marcasite structure at nearby 81 K, the pyrite structure between 196 K and 223 K and calcium carbide structure at room temperature.

There are many more compounds which have different structure at different temperature. If temperature is increased, bonds breaks, atoms scatters and decomposes into a different product (compound or element) . But this does not happen. Rather bond breaks, atoms rearranges to form a different structure of same compound. Why does this happen?

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  • $\begingroup$ You may just as well think it all did happen: bonds broke, atoms scattered, etc. After all, same compound with different structure is but a particular case of "different product". $\endgroup$ – Ivan Neretin Oct 29 '15 at 13:43
  • $\begingroup$ Why do things melt or boil? $\endgroup$ – Jon Custer Oct 29 '15 at 18:30
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You are just entering into the field of Polymorphism. I couldnt find any source for Why polymorphism occurs but you can think about it as Energetically favorable structure at a particular temperature.

Related - Why polymorphs form?

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