Abstract
Vanadium bronze is a nonstoichiometric compound having with a general formula MxV2O5, where M is Li, Na, K, Cu, Ag, Ca, Cd or Pb. The value x varies from 0 to 1. This work was done in order to prepare conductive ceramics containing vanadium bronze (MxV2O5) and to investigate their electrical properties. (1) Films containing lithium and sodium vanadium bronze: A series of films were prepared from gels by quenching of mixed molten oxides Li2O-V2O5 and Na2O-V2O5 into water and heat-treated at various temperatures of 500° to 600°C. The conductivity of these films was about 2S/cm at 40°C. The charge carrier in these films was confirmed to be electron from Seebeck coefficient. (2) The ceramics containing copper and silver vanadium bronze: A series of amorphous materials were prepared by roller-quenching of mixed molten oxides Cu2O-V2O5 and Ag2O-V2O5. Powders of these amorphous were pressed into tablets and heat-treated at various temperatures from 400° to 600°C. The ceramic with the composition of 24Cu2O-76V2O5 showed metallic conduction and its conductivity was about 1S/cm at 30°C. The ceramic with the composition of 14Ag2O-86V2O5 showed a semi-conductive character and its conductivity was about 1S/cm at 30°C.
