Electrical conductivity and relaxation in MoO 3 –Fe 2 O 3 –P 2 O 5 glasses
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Journal of Non-Crystalline Solids, ISSN: 0022-3093, Vol: 345, Page: 494-499
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- Materials Science; MoO3-Fe2O3-P2O5; Dielectric Properties; Electrical Conductivity; Spectroscopy; MoO3-Fe2O3-P2O5; Dielectric Properties; Electrical Conductivity; Spectroscopy; Materials Science and Engineering
The electrical conductivity and dielectric properties of MoO 3 –Fe 2 O 3 –P 2 O 5 glasses have been investigated by impedance spectroscopy in the frequency range from 0.01 Hz to 3 MHz and over the temperature range from 303 to 473 K. With decreasing Fe 2 O 3 content in MoO 3 –Fe 2 O 3 – P 2 O 5 glasses with O/P at 3.5 the dc conductivity, σ dc ( ω ) decreases by two orders of magnitude, which indicates that the conductivity for these glasses depends on Fe 2 O 3 and is independent of the MoO 3 content. Also, the dielectric properties such as ε ′( ω ), ε ″( ω ) and σ ac ( ω ) and their variation with frequency and temperature indicates a decrease in relaxation intensity with increase in the concentration of MoO 3. On the other hand, the dc conductivity for MoO 3 –Fe 2 O 3 –P 2 O 5 glasses with O/P > 3.5 increases with the substitution of MoO 3 which has been explained by an increase in the number of non-bridging oxygens and formation of Fe–O–P bonds that are responsible for the formation of small polarons. The increase in the dielectric permittivity, ε ( ω ) with increasing MoO 3 content is attributed to the increase in the deformation of the glass network with increasing bonding defects.