Green chemistry synthesis and structural and optical study of Dy2(CO3)3 Dy2O3 transition

This paper presents preliminary results of Dy2 (CO3)3 -> Dy2O3 transition have been successfully obtained by Chemical Bath Deposition technical and subsequent thermal annealing temperature at similar to 600 degrees C. Two different temperatures of similar to 20 degrees C and similar to 90 degrees C +/- 2 degrees C are chosen to carry out the nanocrystalline growth. The crystalline phase is investigated by X-Ray Diffraction (XRD) and some optical properties; Transmittance, Reflectivity, Normalized Absorbance, real (n) and imaginary (k) parts refractive index. The crystalline phase of these inorganic nanomaterials for Dy2 (CO3)3 is orthorhombic phase, while for Dy2O3 it is cubic. Grain size average values located at ranged 2.8 - 3.4 nm for Dy2 (CO3)3 and similar to 6.5 - 9.6 nm for Dy2O3. Vibrational modes are identified by Raman spectroscopy, modes at similar to 150 - 1800 cm-1 frequency range assigned to internal vibrations of CO2-3 ion: v-1- symmetric stretching (similar to 1098 cm-1) V3-asymmetric -C-O stretching situated at similar to 1063 cm-1, were observed corresponding to orthorhombic crystalline phase. The Fg + Ag and A1 g modes, corresponding to cubic phase Dy2O3. Absorption measurement were assigned to the transitions from ground state (6H15/2) to different excited states such as 4I13/2 -> 4 F7/2, 4I15/2, 6 F3/2, 6 F5/2, 6 F7/2 -> 6H5/2, 6 F9/2 -> 6H7/2, 6 F11/2 -> 6H9/2 and 6H11/2 of Dy3+ cation. Tauc's plot reveals band gap situated at range similar to 4.66 - 5.17eV for Dy2 (CO3)3 and similar to 4.26 - 4.80eV for Dy2O3 respectively.