CBSE Class 12-science Answered
Explain Non-stoichiometric defects in solids.
Asked by Topperlearning User | 17 Jun, 2016, 10:28: AM
Expert Answer
These defects disturb the stoichiometry of the compound and are of two types: Metal excess defect due to anionic vacancy or extra cations & Metal deficiency defect.
Metal excess defect: ZnO is white and lose oxygen on heating, and the excess Zn metal atoms in the sample are ready to give electrons. Electrons in defect region only absorb light and it becomes yellow. Replacement of Al3+ for Si4+ in quartz gives rise to the color of smoky quartz.
Metal deficiency defect. Sometimes the crystal is not formed as per the stoichiometric proportions e.g. FeO is more typically is found as FexO where x~0.95-0.99.
Charge neutrality must be maintained so some (Fe2+)are missing and the loss is made up by (Fe3+) in FeO crystal.
Answered by | 17 Jun, 2016, 12:28: PM
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