ELECTRICAL-PROPERTIES IN SEMICONDUCTING SRO-V2O5 AND BAO-V2O5 GLASSES

The electrical properties of xSrO-(1-x)V2O5(x=15 to 45 mol%) and xBaO- (1-x)V2O5 (x=15 to 45 mol%) glasses were-studied over a wide range of temperatures and frequencies. The electronic conduction mechanism was analyzed with the small polaron hopping theory. The conduction mechani sm of these glasses was found to be a non-adiabatic electron conductio n. The values for the de activation energy of these glass systems vari ed significantly with increasing of SrO or BaO content. The differenti al thermal analysis results showed a good linear relation with the com position ratio R=MO/V2O5(MO=SrO,BaO) in the low MO (metal oxide) conte nt region(x<35 for SrO and x<40 for BaO) but they deviated from that l inear relationship in the high MO content region (x greater than or eq ual to 35 for SrO and x greater than or equal to 40 for BaO). These re sults shows that some different structure containing, non-bridging oxy gen formed in the high MO content region.