Bismuth Ferrite (BiFeO3), Neodymium (Nd) and Manganese (Mn) (Bi1-xNdxFe1-yMnyO3) with (x, y = 0.03, 0.03; 0.03, 0.05; 0.05, 0.03; 0.05, 0.05) were prepared by Chemical Solution Deposition (CSD) method at annealing temperatures of 550 °C. The effects of addition of Nd and Mn co-dopants in the BiFeO3 on the crystal structure and optical properties are presented. The results of X-Ray Diffraction (XRD) characterization showed that the addition of Nd and Mn co-dopants leads the diffraction angles to shift to smaller angles and to decrease the crystal size. Doped-BiFeO3 samples were characterized by UV-vis in the wavelength range of 200 nm-800 nm. The transmittance value of Bi1-xNdxFe1-yMnyO3 samples decreased in the wavelength range of 400-800 nm (UV light). The addition of Nd and Mn co-dopants to BiFeO3 caused light dispersion and refractive index to decrease.

Bismuth ferrite (BiFeO3) is an interesting multiferroic material due to its ferroelectric properties at room temperature. In this study, Bi1−x Pr x FeO3 and BiFeO3 films were grown on quartz substrates by the chemical solution deposition method at 600oC of annealing temperature. Variation in molar concentration in Bi1−x Pr x FeO3 was set (x = 0.03, 0.05, 0.1, and 0.2) to investigate their crystal structure and optical characteristics. BiFeO3 and Bi1−x Pr x FeO3 films were examined using X-ray diffraction (XRD) and ultraviolet (UV)-vis spectrophotometer. The XRD results demonstrated that the addition of Pr in BiFeO3 shifted the diffraction angle to smaller angles so that it reduced their lattice constant. Besides, the crystal size declined with more Pr numbers, while the lattice strain expanded. The UV-vis characteristics of the films were measured in the wavelength range of 200–800 nm. The transmittance values of the Pr-doped BiFeO3 increased. Because of Pr doping, the refractive index of the Bi1−x Pr x FeO3 films decreased while the energy dispersion increased.

Barium Titanate doped Lanthanum (Ba1-xLaxTiO3) with variations in the concentration of mole dopants Lanthanum (x) 0; 0.01; 0.02; 0.03; 0.04 and 0.05 by co-precipitation method. Bulk BaTiO3 and Ba1-xLaxTiO3 were sintered at 1400 °C for 4 hours. The influence of variations concentration mole dopants of Lanthanum was analyzed through microstructure and electrical properties. The results of X-Ray Diffraction (XRD) analysis showed that the influence of variations concentration mole dopants of Lanthanum caused the diffraction angle to shift to the right. The influence of the variation concentration dopants mole of Lanthanum cause the dielectric constant to increase. The highest dielectric constant of 257.81 is obtained when the concentration of the La dopant mole is 5% (x=0.05) at a frequency of 40 kHz. The influence of Lanthanum dopant concentration variation on the morphology of the sample is that the more mole of dopant La added to BaTiO3 the smaller the size of the sample

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