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CBSE Class 12-science Answered

why does AgBr shows both Frankel and Schottky defect.
Asked by valarmadhi_star | 25 Jun, 2010, 12:00: AM
answered-by-expert Expert Answer
What is unique about AgBr Frenkel pairs is that the interstitial Agi+ are exceptionally mobile. The formation energy of the Frenkel pair is low at 1.16 eV, and the migration activation energy is unusually low at 0.05 eV (compare to NaCl: 2.18 eV for the formation of a Schottky pair and 0.75 eV for cationic migration). These low energies result in large defect concentrations, which can reach near 1% near the melting point.
Answered by | 15 Jul, 2010, 11:22: AM
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