What are the types of non stoichiometric defects ? Niobium forms bcc structure. Calculate the mass of Niobium containing 3.25 x 1021 number of atoms if density of Niobium is 8.55 g/cm3 and the length of unit cell edge is 330.6 pm.
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Types of non - stoichiometric effects: Metal excess defect: Due to anionic vacancies Due to the presence of extra cations interstitial sites, Eg. ZnO Metal deficiency defect: Due to cation vacancies. Eg. In FeO crystal, some Fe2+ cations are missing and extra negative charge is balanced by acquiring extra positive charge by adjacent Fe2+ ion to become Fe3+ ion.
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