2025, Vol.35, No.2

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

pISSN : 1225-1429 / eISSN : 2234-5078
https://journal.kci.go.kr/jkcgct

In this study, we successfully synthesized a glass-ceramic with LiVO₃ crystalline phases via heat treatment of Li₂Cl₂-Li₂O-B₂O₃-V₂O₅-based glass, a composition not previously reported for solid-state electrolytes. Thermal properties were measured using differential thermal analysis (DTA), and kinetics analysis was conducted based on these data. As indicated by XRD patterns, the as-prepared sample exhibited the characteristic halo pattern of glass, while the formation of crystalline phases was observed with increasing heat treatment time, identified as LiVO₃. The intensity of the LiVO₃ peaks in the XRD pattern increased with extended heat treatment, eventually reaching saturation. Additionally, ionic conductivity was observed to improve, likely due to the facilitation of Li-ion conduction within the LiVO₃ crystals. The activation energy for LiVO₃ crystallization within the glass matrix was determined to be 190 kJ/mol (Kissinger method) and 203 kJ/mol (Marotta method) based on DTA analysis. The Ozawa exponent, derived via the Ozawa method, suggested one-dimensional growth of the LiVO₃ crystals.

Eu2O3 and Er2O3 doped La₂O₃–Al₂O₃ and Y₂O₃–Al₂O₃ glass systems were successfully synthesized by containerless processing. Photoluminescence (PL) analysis revealed that Eu₂O₃-doped glasses exhibited the highest emission intensity at 1 mol%, with a decrease at higher concentrations (1.5 mol% and 2 mol%) due to concentration quenching. Similarly, Er₂O₃ doping resulted in reduced PL intensity beyond 1 mol%, with Er2O3-Y2O3-Al2O3 glasses exhibiting weaker quenching effects than Er2O3-La2O3-Al2O3 due to differences in ionic radii. Additionally, Eu³⁺-doped glasses showed lower resistance to quenching compared to Er³⁺-doped glasses. These results demonstrate the successful synthesis of new aluminate glass compositions with tunable luminescent properties, offering potential applications in fluorescent glass materials.

The feasibility of the PLLA/gelatin absorbable periodontal tissue regeneration barrier membrane was investigated by examining the biological stability (cytotoxicity, guinea pig maximization test, intradermal test, acute systemic toxicity, and chromosome abnormalty test) and efficacy evaluation using a rat calvarial defect model. As a result of the biological stability evaluation, no abnormal results were observed, indicating excellent biocompatibility. In addition, the transplantation test using a bone defect model for 2 weeks exhibited no significant difference in the volume of regenerated bone and average weight loss of more than 20 %. As a result of the skull observation, the barrier membrane was well fixed to the transplantation site, properly shielding the bone defect area, and no inflammatory response was observed. The experimental results suggest that PLLA/gelain barrier membrane was well suited for absorbable periodontal tissue regeneration.