why does AgBr shows both Frankel and Schottky defect.

Asked by valarmadhi_star | 25th Jun, 2010, 12:00: AM

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  | 15th Jul, 2010, 11:22: AM

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