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Here we report the synthesis of Sm-doped Na 0.5 Bi 4.5 Ti 4 O 15 (Na 0.5 Sm 0.5 Bi 4 Ti 4 O 15 ) lead-free ceramics via a conventional solid-state technique. Investigations of Na 0.5 Bi 4.5 Ti 4 O 15 (NBT) and Na 0.5 Sm 0.5 Bi 4.5 Ti 4 O 15 (NSBT) ceramics were demonstrated in detail to understand the composition-based structure-property of Aurivillius compounds and related functional material. Dielectric properties for frequency and temperature in a wide range were analyzed. The conduction activation energy values of NSBT ceramics are obtained to be 1.40 eV, whereas, the NBT ceramics get the value to be 1.31 eV. At higher temperatures, the conduction activation energy value of NSBT ceramics is 1.32 eV for both frequencies of 100 Hz and 1 kHz, whereas, for NBT compounds, the calculated value is 1.27 eV for both frequencies. The simulation performed on the impedance data for capacitive and resistance elements shows well-fitting curves which indicates a single relaxation behavior in the material. Similarly, the AC -conductivity data were analyzed which gives different conduction processes and relaxation activation energies in the NSBT ceramics., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Authors.)

Pure and manganese-doped titanium dioxide nanoparticles (MnTiO 2 -NPs) were synthesized by the defect-oriented hydrothermal approach. The synthesized material was then characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), and UV-visible spectroscopy (UV-Vis). The agar well diffusion method assessed the antibacterial efficiency of TiO 2 and MnTiO 2 -NPs against E. coli and S. aureus . Zone of inhibition (ZOI) formed by pure TiO 2 was observed as 12 mm and 11.5 mm against E. coli and S. aureus , while for MnTiO 2 -NPs it was observed as 19 mm ( E. coli ) and 21 mm ( S. aureus ). The concentration of synthesized nanoparticles (10 mg/ml, and 20 mg/ml) was used for antibacterial studies. The efficacy of the pure and MnTiO 2 -NPs as an active photocatalyst for the degradation of methylene blue (MB) dye was also assessed using a UV light. It was observed that the photodegradation efficiency of 1 g of MnTiO 2 -NPs was higher than the same amount of pure TiO 2 . The results suggest that the photocatalyst concentration directly impacts the photodegradation of MB dye. The pH value was found to influence the photodegradation of MB dye at higher pH values. Based on the obtained results, MnTiO 2 -NPs were observed as a promising agent for microbial resistance and water remediation., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. The author is an Editorial Board Member/Editor-in-Chief/Associate Editor/Guest Editor for [Journal name] and was not involved in the editorial review or the decision to publish this article. The authors declare the following financial interests/personal relationships which may be considered as potential competing interests., (© 2024 The Authors.)