What makes Glass and some types of Plastic clear? Why couldn’t we make clear metal or other “clear” Materials?
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First of all not all of glass is transparent. Glass is just a definition of order of atoms in a solid. For example you can make a glass out of metal (but it’s not easy and also not transparent) or vanadium oxide (not transparent either).
Your everyday transparent glass, is usually made of quartz + some additions. Quartz in its crystalline form is transparent. Even though glass is not a crystal, some short range order of atoms is still present and some of the properties will also be similar to its crystalline form.
Source: made some optical glass for my masters. Don’t know shit about polymers though, so I am not saying anything about that.
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