Electrical and optical properties of Neodymium ions doped P2O5-ZnO-Na2O-Li2O glasses
Electrical and optical properties of Neodymium ions doped P2O5-ZnO-Na2O-Li2O glasses
Sodium zinc lithium phosphate glasses doped with Nd3+ were prepared by the melt-quenching method. The optical, structural, and electrical properties of the glass samples were characterized by XRD, density, FTIR and UV-VIS analysis. XRD results revealed that all the samples are amorphous. DTA analysis showed that the transition temperatures of glasses increase with Nd2O3 content. FTIR studies revealed that the glasses consist of Q3, Q2, Q1 and Q0 structural units. The effect of annealing on the absorption coefficient spectra of the samples in the UV-VIS range were studied to evaluate the optical energy gap. The dc, ac electrical conductivity (σdc and σac),and dielectric constants (ε' and ε'') of all the samples have been investigated. Temperature dependence of σdc is found to obey Arrhenius law. With increasing Nd2O3 content σdc increase while the values of the activation energies ΔE1 and ΔE2 decrease. dc conductivity (σdc),and activation energies (ΔE1, ΔE2) were found to be affected by annealing. The ac conductivity follows the power law σac(ω) = Aωs, the exponent s has values between 0.875 and 0.991, consequently, the obtained results have been analyzed by (CBH) model. Conductivity mechanisms for grain resistance at room temperature were discussed using the Cole-Cole plot.
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