Prove that 5-fold rotation axis cannot exist in a crystal lattice. Discuss the failure of classical theory in explaining the
observed temperature dependence.
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The reason why this is not possible is because the external shape of the crsytal is dependent on the geometric arrangements of atoms. Therefore, crystals cannot have 5, 7, 8, and other higher-fold rotational axes. Crystals do appear to have 5-fold symmetry but these symmetries are not possible.
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