Synthesis, Properties and Photocatalytic Activity of CaTiO3-Based Ceramics Doped with Lanthanum

Abstract

The aim of this work is to study the effect of lanthanum doping on the phase formation processes in ceramics based on CaTiO3, as well as to evaluate the effectiveness of the ceramics as photocatalysts for the decomposition of the organic dye Rhodamine B. The methods used were scanning electron microscopy to evaluate the morphological features of the synthesized ceramics, X-ray diffraction to determine the phase composition and structural parameters, and UV-Vis spectroscopy to determine the optical properties of the ceramics. During the experiments it was found that an increase in the lanthanum dopant concentration from 0.05 to 0.25 mol leads to the formation of the orthorhombic phase La0.3Ca0.7TiO3 and the displacement from the ceramic structure of the impurity phase TiO2, which presence is typical for the synthesized ceramics by solid-phase synthesis. On the basis of the data of the X-ray phase analysis the dynamics of phase transformations depending on concentration of lanthanum was established: CaTiO3/TiO2 → CaTiO3/La2TiO5 → CaTiO3/La0.3Ca0.7TiO3 → La0.3Ca0.7TiO3. During the determination of photocatalytic activity it was found that the formation of La0.3Ca0.7TiO3 phase leads to an increase in the decomposition rate as well as the degree of mineralization.

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

“…These observed peaks correspond to orthorhombic symmetry with a perovskite-like structure 14 , 34 . Minor secondary phases were observed in the XRD pattern, which belongs to TiO 2, Ca(OH) 2, and CaO phases 35 , 36 . The average crystallite size of CaTiO 3 was estimated using WinFit 1.2.1 (1997) software 37 , which was approximately 24.5 nm.…”

Analysing the suitability of CaTiO3/Ca1–xSrxTiO3/SrTiO3 perovskite for fabrication of optoelectronic devices using QuantumATK tool: a study for electronic and optical properties

“…The structural properties of CaTiO 3 perovskite have been calculated using QuantumATK Tool version U-2022.12 SP1 [27] methodology based on the GGA (Generalized Gradient Approximation) and PBE (Perdew-Burke-Ernzerhof) [30][31][32] functionals for Linear Combination of Atomic Orbitals (LCAO) calculator. The numerical accuracy parameters-density mesh cutoff was set at 125 Hartee, k-point sampling was taken (5 × 5 × 4) with occupation method of Fermi-Dirac keeping tolerance 0.0001 and broadening 1000 K. The basic set of medium Pseudopotential [30] with PseudoDojo [33][34][35][36][37] and theoretical results [41,42,45,47]. The difference in the lattice paramter betweeen our result and experimental results are 0.32%, 0.29% and 0.06% for a, b, and c respectively which is proof for the excellent validity and accurancy of the results.…”

“…Gist of the whole paper and results obtained has been presented in the Conclusions section which is further followed by detailed list of references. [33], 5.372 [34], 5.3958 [35] 5.36 [41] 5.4338 [42] 3.931 [27,45] 5.4378 [33], 5.445 [34], 5.4261 [35] 5.45 [41] 5.4886 [42] 3.931 [27,45] 7.6464 [33], 7.629 [34], 7.6165 [35] 7.62 [41] 7.6841 [42] 3.931 [27,45] 156.8 [35] Simple Orthorhombic 223.9 [36] The complete study of this paper has been performed using the Quantum ATK Software Tool [29]. The doping of Sr was done through the NanoLab GUI using the Crystal Builder tool of QuantumATK Software.…”

Accelerating Charge Separation and CO2 Photoreduction in Aqueous Phase under Visible Light with Ru Nanoparticles Loaded on Ga-Doped NiTiO3 in a Batch Photoreactor

“…Several approaches have been explored in the literature to enhance the light-harvesting capacity of ATiO 3 perovskites. One successful method incorporates metal dopants, such as Rh, La, Al, and Bi, into the ATiO 3 lattice. − These dopants can either replace Ti 4+ ions in the lattice structure or occupy interstitial positions. Suitable metal dopants (i) regulate the charge carrier concentration, mobility, and lifetime and (ii) create doping-induced states exhibiting localized or delocalized characteristics between the valence band (VB) and the conduction band (CB) .…”