Define the following with suitable examples: (a) F-centres, (b) Antif – InterviewSolution

1.	Define the following with suitable examples: (a) F-centres, (b) Antiferromagnetism.
Answer» SOLUTION :(a)F - centres . In non- stoichiometriccompounds, the sites containgthe entrappedelectronsin theanionicvacancieswhichimpartcolourto theCrystralsare calledF- centres . (B )ANTIFERROMAGNETISM. Thesubstances whichareexpectedto possess paramagnetismor ferro magnetismon the basisofunpairedelctronbuthavezeronetmagneticmomentdue tothe presenceof equalnumberof domainsin theoppositedirections arecalledantiferromagneticsubstancesand thisphenomenin iscalledantiferromagnetisme.g MnO

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