A non-stoichiometric compound is a type of compound whose composition cannot be expressed as a simple whole-number ratio of its constituent elements. In contrast to stoichiometric compounds, where the elements are present in fixed proportions, non-stoichiometric compounds may have varying ratios of elements due to factors such as defects in the crystal structure or the presence of vacancies (missing atoms) or interstitials (extra atoms) within the lattice.
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