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- Title
Synthesis, microstructural, rietveld refinement and optical characterizations of sol–gel grown cerium oxide ceramics.
- Authors
Dhruv, S. D.; Kolte, Jayant; Solanki, Pankaj; Sharko, S. A.; Solanki, Vanaraj; Tailor, Jiten; Chaudhari, Ketan; Agrawal, Naveen; Patel, V. A.; Markna, J. H.; Kataria, Bharat; Dhruv, D. K.
- Abstract
The cerium oxide (CeO2) ceramics have been synthesized in the current study by employing the sol–gel technique. Synthesized CeO2 ceramics were eyed for their crystal structure and phase purity using X-ray diffraction (XRD). The crystallographic space group (SG) of synthesized CeO2 ceramic is f m 3 ¯ m (225) , with a single-phase cubic structure. The CeO2 ceramic's stacking fault morals for the most intense peaks have been calculated ( 8.5325 × 10 - 4 ). A value of unity was obtained for the favored orientation of the crystallites along a crystal plane (hkl) by measuring the texture coefficient (Ci) of each XRD peak of the CeO2 ceramic. Based on the calculations, the CeO2 ceramic has a degree of preferred orientation (σ) of 0.1566. The lattice constant for CeO2 ceramics is 0.5375 nm, which yields a cell volume of 0.1585 nm3 using Miller indices for the prime (1 1 1) plane. Bravais's theory calculates the distance between crystal planes (dhkl) to understand material growth and infers the significance of CeO2's (1 1 1) plane. Fullprof suite Rietveld refines XRD data. Numerous methods such as Nelson–Riley (N–R), Scherrer, Stokes–Wilson (S–W), Monshi, Williamson–Smallman (W–S), Williamson–Hall (W–H), size-strain plot (SSP) and Halder–Wagner (H–W) methods have determined CeO2 ceramic's microstructural parameters such as lattice constant (a), the crystallite size (D), strain (ε ), dislocation density (δ), stress (σ), Young's modulus (Y), and energy density (u). Elemental mapping analysis was used to determine the elemental distribution of synthesized CeO2 ceramics. Pycnometers confirmed CeO2's density (7.2089 gm-cm−3). Fourier transform infrared (FTIR) spectroscopy found an intense band near 1020 cm−1, indicating C=C stretching mode and double bonds in CeO2 ceramics. The UV–VIS–NIR spectrometer recorded CeO2 ceramics' reflectance spectra at room temperature. The absorption spectra display a pair of clearly visible peaks at 242 and 374 nm. The optical spectra of CeO2 ceramics reveal extinction coefficient (k) and refractive index (η) of 0.2016 × 10 - 4 and 2.40 at characteristic wavelength (λc = 374 nm). Tauc and Kubelka–Munk's methods determined CeO2 ceramic's optical bandgap (Eg = 3.32 eV). Near λc, the imaginary ( ε i ) and real ( ε r ) dielectric constants are 9.5457 × 10 - 4 and 5.7549, respectively, and the dissipation factor (tan δ) value is 1.6569 × 10–4. Optical (σo) and electrical ( σ e ) conductivity maxima and minima for CeO2 ceramics occur at 3.34 eV. The values of Urbach's energy (EU) and Urbach absorption coefficient ( α 0 ) for CeO2 are 0.5006 eV and 0.9176 m−1, respectively. The VELF and SELF measurements of electron energy loss showcase the prerequisite CeO2 peaks at 3.3423 and 4.9600 eV, respectively. CeO2 ceramics emit UV-Blue under UV excitation and are elucidated by the electron transition in photoluminescence at room temperature. The implications are addressed.
- Subjects
OXIDE ceramics; RIETVELD refinement; CERAMICS; YOUNG'S modulus; PERMITTIVITY; LATTICE constants
- Publication
Journal of Materials Science: Materials in Electronics, 2024, Vol 35, Issue 18, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-024-12943-4