For the first time, the CaO-TiO2-P2O5 system was used to prepare phosphate glass ceramic doped with neodymium using the melt-quenching method at temperatures of 1350–1400 ◦C. Differential Thermal Analysis was used to investigate the thermal behavior of each glass sample, including the glass transition temperature (Tg), nucleation temperature (Tn), crystallization temperature (Tc), and onset of crystallization peak temperature (Tx). The Poulain and Hruby methods showed that increasing the neodymium content from 0.5 mol.% to 1.5 mol.% resulted in an 8 % decrease in glass stability and a 35 % increase in crystallization tendency. The type of crystallization also changed from surface to volume. Glass-ceramic samples were nucleated at 675 ◦C for 32 h, followed by growth at 795 ◦C and 830 ◦C for 6 h. XRD analysis identified crystalline phases Ca3(PO4)2, and CaTi4(PO4)6 at 795 ◦C and 830 ◦C. The crystal phases transformed from metaphosphate to NASICON. The crystal size was calculated and showed that neodymium caused a significant reduction in crystal size in glass-ceramics containing 0.5 mol% neodymium. FE-SEM micrographs of the prepared glass-ceramics confirmed the reduction in crystal size with the addition of neodymium oxide. Comparison of photoluminescence results for glass and glass-ceramics containing 0.5 mol.% Nd2O3 showed a decrease in emission intensity at 584 nm due to increased wave scattering from deposited phases.
