The non-surgical treatments are being required to reconstruct damaged tissue, prioritizing our body’s natural healing process. Thus, the use of bioactive materials such as bioactive glass has been studied to support the repair and restoration of hard and soft tissue. Thus, in this work Bioglass 45S5 was developed, adding 1 and 2%mol of SrO or MgO and the physical and biological properties were evaluated. The addition of MgO and SrO at the studied concentrations promoted the slight increase in non-bridging oxygens number, observed through the temperature shift in phase transitions to lower values compared to Bioglass 45S5. The insertion of the ions also showed a positive effect on Saos-2 cell viability, decreasing the cytotoxic of Bioglass 45S5. Besides the Ca/P ratio on the pellets surface demonstrating no evidence of higher reactivity between Bioglass 45S5 and Bioglass with Sr and Mg, micrographs show that at 24 h the Ca/P rich layer is denser than in Bioglass 45S5 after the contact with simulated body fluid. The samples with Sr and Mg show a higher antibacterial effect compared to Bioglass 45S5. The addition of the studied ions may benefit the biological response of Bioglass 45S5 in dental applications as scaffolds or coatings.

Layered Ruddlesden-Popper (RP) lanthanide nickelates, Ln_n+1Ni_nO_3n+1 (Ln = La, Pr, and Nd; n = 1, 2, and 3) have generated great interest as potential cathodes for proton conducting fuel cells (PCFCs). The high-order phase (n = 3) is especially intriguing, as it possesses the property of a high and metallic-type electronic conductivity that persists to low temperatures. To provide the additional requirement of high ionic conductivity, a composite electrode is here suggested, formed by a combination of La₄Ni₃O_10±δ with the proton conducting phase BaCe_0.9Y_0.1O_3-δ (40 vol%). Electrochemical impedance spectroscopy (EIS) is used to analyse this composite electrode in both wet (p_H2O ~ 10⁻² atm) and low humidity (p_H2O ~ 10⁻⁵ atm) conditions in an O₂ atmosphere (400–550 °C). An extended analysis that first tests the stability of the impedance data through Kramers-Kronig and Bayesian Hilbert transform relations is outlined, that is subsequently complemented with the distribution function of relaxation times (DFRTs) methodology. In a final step, correction of the impedance data against the short-circuiting contribution from the electrolyte substrate is also performed. This work offers a detailed assessment of the La₄Ni₃O_10±δ-BaCe_0.9Y_0.1O_3-δ composite cathode, while providing a robust analysis methodology for other researchers working on the development of electrodes for PCFCs.

Transition metal (oxy)nitrides are attractive materials due to their notable catalytic and electronic properties. Vanadium (oxy)nitrides, in particular, have generated high interest due to their wide applicability in heterogeneous catalysis, energy-related research (e.g., supercapacitors), and superconductors. One of the most promising ways to synthesize these materials is by ammonolysis. However, thermodynamic calculations predict that the chemical potentials of both the nitrogen and hydrogen precursors are dependent on the synthesis temperature, potentially influencing the N/O ratio of the formed (oxy)nitride. The current work, therefore, clarifies the effect of ammonolysis temperature on the (oxy)nitride composition and resultant physical properties. A series of vanadium (oxy)nitrides are formed by reacting V₂O₅ with gaseous ammonia in the temperature range 600–1000 °C. The synthesized materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA), and X-ray photoelectron spectroscopy (XPS). The unit cell volume of the crystal is shown to increase with ammonolysis temperature, being concomitant with increased nitrogen incorporation. Kinetic analysis was performed by isoconversional and model-based methods, showing that the amount of incorporated nitrogen has a strong impact on materials stability, beneficially increasing the resistance towards oxidation. The work demonstrates that it is possible to compositionally tune the anionic sublattice of vanadium (oxy)nitride by controlling the ammonolysis temperature, where this method can be used as a tool to tailor resultant properties towards potential applications.