Effects of (Li_0.5Nd_0.5)²⁺ on the phase evolution, Raman spectra and microwave dielectric properties in CaO-Nd₂O₃-TiO₂ ceramic

The rapid advancement of mobile communications technology is imposing greater demands on electronic components. Microwave dielectric ceramics with a high dielectric constant (epsilon(r)) are crucial for the miniaturization and integration of microwave devices. Herein, The perovskite-structured (Ca0.61Nd0.26)(1-x )(Li0.5Nd0.5) x TiO3 (0 <= x <= 0.8) microwave dielectric ceramics with high epsilon(r) value were prepared by solid-state reaction method. The results demonstrated that the epsilon(r) value reached its peak at x = 0.6, which was influenced by the bond valence at B-sites. The tau(f) and Q x f values decreased with increasing x value. Doping (Li0.5Nd0.5)(2+) at A-sites led to an increase in the full width at half maximum of Raman peaks, indicating higher internal loss. A high dielectric constant and temperature-stable (Ca0.61Nd0.26)(0.27)(Li0.5Nd0.5)(0.73)TiO3 ceramic can be sintered with good microwave dielectric properties of epsilon(r )= 129.4, Q x f= 2,787 GHz, and tau(f) = +1.9 ppm/degree celsius.