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What is Metal Excess Defect?
Dear Devang, Metal excess defect occurs due to :- 1) Anionic vacancies. 2) Presence of extra cations. 1) Metal excess defect due to anionic vacancies- When crystals of NaCl(example) are heated in an atmosphere of Na vapour,Na atoms are deposited on the surface of the crystals and Cl- ions diffuse to the surface of the crystals to combine with Na to form NaCl.This happens by loss of electrons by Na atoms to form Na+ .These realesed electrons diffuse into the crystals and occupy anionic sites.As the result,crystal now has an excess Na. 2) Metal excess defect due to presence of extra cations - On heating ZnO(example),it loses oxygen.Now there is an excess Zn+2 ion. Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums. Reward points 5 + 15 for all those who upload their pic and download the ASKIITIANS Toolbar, just a simple to download the toolbar…. So start the brain storming…. become a leader with Elite Expert League ASKIITIANS Thanks Aman Bansal Askiitian Expert
Dear Devang,
Metal excess defect occurs due to :-
1) Anionic vacancies.
2) Presence of extra cations.
1) Metal excess defect due to anionic vacancies- When crystals of NaCl(example) are heated in an atmosphere of Na vapour,Na atoms are deposited on the surface of the crystals and Cl- ions diffuse to the surface of the crystals to combine with Na to form NaCl.This happens by loss of electrons by Na atoms to form Na+ .These realesed electrons diffuse into the crystals and occupy anionic sites.As the result,crystal now has an excess Na.
2) Metal excess defect due to presence of extra cations - On heating ZnO(example),it loses oxygen.Now there is an excess Zn+2 ion.
Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums. Reward points 5 + 15 for all those who upload their pic and download the ASKIITIANS Toolbar, just a simple to download the toolbar….
So start the brain storming…. become a leader with Elite Expert League ASKIITIANS
Thanks
Aman Bansal
Askiitian Expert
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