69 research outputs found
Optical investigations of La0.7Ca0.3-xKxMnO3 (x = 0.00, 0.05 and 0.10) probed by spectroscopic ellipsometry
Using spectroscopic ellipsometry, we have studied the optical properties of doped manganites at the paramagnetic state in polycrystalline La0.7Ca0.3-xKxMnO3 samples for (x = 0.00, 0.05 and 0.10) in the energy range of 3.2-5.5 eV at room temperature. The surface morphology of the samples was obtained by using atomic force microscopy (AFM). Refractive indices, extinction coefficients, the transmission ellipsometric parameters Ψ and Δ are investigated at different wavelengths. The study of the optical conductivity σ reveals that optical behaviour and the activated transport in the paramagnetic state of these materials are consistent with Jahn-Teller small polaron. In addition, the spectrum of the complex dielectric constant ε reveals peaks for all samples, the results may be explained by the presence of space charges from the strongly dipole-allowed O(2p)−Mn(3d) transition
Effects of potassium incorporation on the structural, optical, vibrational and electrical properties of NiO sprayed thin films for p-type optical windows
The effects of thermal treatment on structural, morphological and optical properties of electrochemically deposited Bi2S3 thin films
Investigation of some physical properties of pure and Co-doped MoO3 synthesized on glass substrates by the spray pyrolysis method
Low-cost route synthesis, structural, electrical and electrochemical investigations on shandite Ni3Sn2S2 sprayed thin film
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