Elastic study and optical dispersion characterization of Fe-substituted cobalt aluminate nanoparticles
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Elastic study and optical dispersion characterization of Fe‑substituted cobalt aluminate nanoparticles D. El‑Said Bakeer1,2 Received: 1 March 2020 / Accepted: 12 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The point of this work is to study the impact of Fe3+ ions substitution on the structural, elastic and optical properties of CoAl2O4 nanoparticles. A series of CoAl2−xFexO4 nanoparticles, 0.00 ≤ x ≤ 0.20, are prepared by chemical co-precipitation method. X-ray diffraction besides the FTIR examination affirms the forming of single-phase cubic spinel CoAl2O4 for Fe3+-substituted samples. The lattice constant a is found to be increased with increasing Fe3+ content obeying Vegard’s law. The dependence of theoretical density, porosity and crystallite size on F e3+ content x is discussed. FTIR spectral analysis is used to estimate the elastic moduli such as stiffness constant, Young’s modulus, rigidity modulus, bulk modulus, Poisson’s ratio, wave velocity and Debye temperature. The stiffness constants and Poisson’s ratio increase with the increase in Fe3+ content due to the decrease in porosity and substitution process. The values of Young’s modulus, rigidity modulus and Debye temperature reduce with an increase in the F e3+ content, whereas the bulk modulus increases with x. The optical properties of C oAl2–xFexO4 nanoparticles are analyzed using UV–Vis spectrophotometer measurements in the spectral range of 200–1100 nm. Some of dispersion parameters are evaluated based on a single oscillator model, such as oscillator energy Eo, dispersion energy Ed, lattice dielectric constant εl, the average value of oscillator strength, SO, and wavelength of single oscillator λO. The most important result of the current work is the use of F e3+ ion substitution in C oAl2O4 nanoparticles, which can be used to modify the elastic moduli, optical band gaps and dielectric constant. Keywords Cobalt aluminate · Infrared spectroscopy · Williamson–Hall method · Co-precipitation method · Elastic properties · UV
1 Introduction Spinel cobalt aluminate (CoAl2O4) has attracted a lot of interest than other metal aluminates, because it has a series of superior properties, such as high resistance to acids, chemical and thermal stability, color stability and high refractive index [1–3]. The structure and excellent properties make CoAl2O4 promising in many applications, such as pigments, magnetic materials catalysts and sensors [4–6]. CoAl2O4 is spinel-type oxide AB2O4, where A and B stand for divalent and trivalent metal cations, respectively. Owing to the presence of the d–d transitions of the C o2+, * D. El‑Said Bakeer [email protected] 1
Physics Department, Faculty of Science and Arts at Al‑Ula, Taibah University, Madinah, Saudi Arabia
Physics Department, Faculty of Science, Damanhour University, Damnhour, Egypt
2
the color of C oAl2O4 is blue and C oAl2O4 is also known as Thenard’s blue. The magnetic and optical properties of the spinel aluminate nanocrystalline depe
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