B Covalent bonds in diamond

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PatrickP2
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We all know that when we scratch a diamond with another diamond, millions and millions of covalent bonds are broken. I would like to ask what happens when a diamond burns in the atmosphere at temperatures above 750 C? Does the reaction of oxygen and carbon also break the bonds, or are we dealing with a different phenomenon here?
 
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Yes, explicitly chemical reactions involve the breaking and/or forming of bonds. In the case of diamond, the C-C bonds are broken, and C=O double bonds are formed.
 
From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...

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