The present work investigates the optical and dielectric properties of three Sr-doped rare earth copper oxide RE1.8Sr0.2CuO4±δ (RE=La, Nd, Pr) synthesized by the solid-state reaction at 1000 °C. The title samples were characterized by X-ray powder diffraction which shows that the three samples crystallize in the tetragonal system with close unite cell parameters. The morphology and the practical size of the powder were studied by the means of Scanning Electron Microscopy and the grain size are about 1-5µm. The optical band gap of the titled compounds have been determined and they are in the 1.19-1.30 eV range. Detailed studies of dielectric properties of the compounds as a function of frequencies at different temperatures (270-500°C) show that La1.8Sr0.2CuO4±δ and Pr1.8Sr0.2CuO4±δ have a very high dielectric constant ε'>10 9 compared to Nd1.8Sr0.2CuO4±δ (ε'≈800). While La1.8Sr0.2CuO4±δ and Pr1.8Sr0.2CuO4±δ have an important dielectric loss (≈ 65-70) compared to Nd1.8Sr0.2CuO 4±δ which has a very low value (≈ 0.65).
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