45 ii energy is required to force the atom into closer contact with neighbouring atoms as it moves among them. C some lattice sites are vacant. Pin By Angel On Materials Science And Engineering Study Materials Science And Engineering Materials Science Science From the oxygen solubility dependence it follows that the oxygen is present in a supersaturated state and hence it will tend to cluster during thermal treatments. . It is a defect in which an atom or molecule occupies the intermolecular spaces in crystals. A an ion moves to interstitial position between the lattice points b electrons are trapped in a lattice site c some lattice sites are vacant d some extra cations are present in interstitial space. Li can diffuse through vacant tetrahedral and octahedral interstitial sites in the three-dimensional structure. Interstitial sites are the sites located between regular positions and are empty. A crystal oscillator is an e