UNUSUAL TRANSPORT AND STRUCTURAL-PROPERTIES OF MECHANICALLY TREATED POLYCRYSTALLINE SILVER-IODIDE .3. STRUCTURAL STUDY

The effect of mechanical treatment on the crystal structure of AgI was studied by X-ray diffraction and EXAFS techniques. It was shown that even moderate mechanical treatment of AgI results in the appearance of stacking faults in a close-packed anion sublattice. After an intense mechanical treatment the random beta-gamma polytype structure is forme d. The polytypes are built of domains separated by antiphase boundarie s which are the most probable sources of cationic Frenkel defects gove rning the high ionic conductivity and anomalous dielectric properties of mechanically treated AgI.