https://www.acerp.ir/ Advanced Ceramics Progress en daily 1 Wed, 01 Apr 2026 00:00:00 +0330 Wed, 01 Apr 2026 00:00:00 +0330 https://www.acerp.ir/article_247046.html Understanding the defect-mediated migration mechanisms in solid electrolytes is critical for optimizing lithium-ion conductivity. This study investigates Li⁺ transport in lithium halide hydroxide anti-perovskite materials by systematically correlating defect structures with electrochemical performance. Samples with controlled compositions of 〖"Li" 〗_2 ("OH" )_(1-x) "F" _x "Cl (x=0.005)" were synthesized to stabilize orthorhombic, cubic, and Ruddlesden–Popper (RP) structural phases. To investigate ion transport mechanisms and elemental shifts during thermal cycling, EIS and EDS techniques were employed. EIS analysis revealed distinct activation energies associated with specific migration mechanisms: low-temperature transport in the RP and cubic phases was governed by Li⁺ vacancy or interstitial dumbbell migration, whereas high-temperature regimes were dominated by Schottky defect formation in LiCl or Li₂O. Complementary EDS findings indicated an increase in oxygen vacancies post-cycling, thereby corroborating the hypothesis regarding Schottky pair generation. Furthermore, high grain boundary resistance was attributed to excessive barriers arising from hydrogen-related defects. These findings provide a mechanistic framework for designing low-resistance solid-state electrolytes through the control of defect chemistry. https://www.acerp.ir/article_222519.html Stainless steel is widely utilized in implant fabrication due to its superior mechanical properties. However, despite its excellent mechanical characteristics, stainless steel, like other metals, lacks significant biological functionality. To enhance its biocompatibility and make it a successful biomaterial, the application of biocompatible coatings becomes crucial. These coatings aim to improve implant integration and optimize performance by introducing biological features such as the stimulation of cell growth and the reduction of inflammation. In the current investigation, coatings of TiO₂ and TiO₂-CeO₂ were applied using the magnetron sputtering method. Results from field emission scanning electron microscopy (FESEM) revealed that the average thickness of the TiO₂ and TiO₂-CeO₂ coatings was 115 nm and 100 nm, respectively. Following doping with CeO₂, controlled grain growth occurred, leading to a more uniform and compact distribution of nanoparticles. Fourier-transform infrared spectroscopy (FTIR) results confirmed the coexistence of the two metal oxides, TiO₂ and CeO₂, as evidenced by the broadening of the peak associated with metal-oxygen stretching vibrations at wavenumbers below 1000 cm⁻¹. In vitro test outcomes demonstrated that cells cultured on the uncoated substrate exhibited small, rounded morphology with no observable filopodia. Cells on TiO₂-coated surfaces exhibited a spindle morphology, while those adhered to the TiO₂-CeO₂ coating displayed a branched morphology with wide filopodia. Fluorescence microscopy images indicated higher cell viability in the TiO₂-CeO₂-coated sample compared to the TiO₂-coated sample, attributed to the influence of Ce⁴⁺ on cell proliferation.