Origin of FSDP in superionic AgI–Ag2O–V2O5 glasses

FSDP measurements were performed by X-ray diffraction, neutron diffraction and elastic neutron scattering experiments for AgI–Ag2O–V2O5 and some of AgBr–Ag2O–V2O5, AgCl–Ag2O–V2O5 and AgI–AgPO3 glasses at room temperature. FSDP observed by X-ray diffraction is due to the density fluctuation of the network structure. Composition change of this FSDP profile for AgI–Ag2O–V2O5 glasses corresponds to those of the ionic conductivity and the molar volume. New FSDP was found in the high AgI region of AgI–Ag2O–V2O5 system by elastic neutron scattering. FSDP observed by neutron scattering suggests the formation of medium range order of doped AgI in highly AgI-doped glasses.