(In_1/2Nb_1/2)TiO₂ (IN-T) ceramics were prepared via a solid-state reaction route.

Microwave absorption performance and mechanisms of core–shell SiO₂@C and hollow carbon nanospheres with different sizes.

${\text{Sr}}_{1-x}{\text{Pr}}_x{\text{TiO}}_3$ ceramics $\left(0.00\le x\le 0.03\right)$ were prepared by a traditional solid-state reaction method. Two relaxation processes (marked as A and B) of the ${\text{Sr}}_{0.09}{\text{Pr}}_{0.01}{\text{TiO}}_3$ ceramics were investigated by analyzing the $E_a$ values obtained from the Arrhenius law. Colossal dielectric constant (CDC) was first obtained in ${\text{Sr}}_{0.09}{\text{Pr}}_{0.01}{\text{TiO}}_3$ ceramics, whose permittivity was up to 3000 (1 kHz, room temperature), greater than that of pure ${\text{SrTiO}}_3$ ceramics and samples with more Pr addition ($x=0.02$ and 0.03). This CDC behavior was related to the internal barrier layer capacitance mechanism.