Abstract
EPR probed the zincblende (γ) to cubic (α) AgI structural phase transition in AgI through two intrinsic paramagnetic centers: an Ag 2+ based hole center (signal "A") and an Ag 0 based conduction electron center (signal "B") associated with AgI nanocrystallites. A sudden drop in intensity ( I PP), 〈g〉, and Δ H PP was observed at 423 K for pure AgI nanocrystals. Cu in AgI increases the thermal stability of the cation sublattice from 423 K (undoped AgI ) to 453 K ( Ag 0.75 Cu 0.25 I ) through the strengthened Ag-I bond. A sudden jump in the reciprocal susceptibility observed at well above the phase transition reflects the local bonding configuration in the γ -AgI structure.
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