Flash sintering preparation and colossal dielectric origin of (Al0.5Ta0.5)0.05Ti0.95O2 ceramics

Two-step flash sintering of (Mg1/3Ta2/3)0.01Ti0.99O2 giant dielectric ceramics

“…Figure 1 shows the variation curves of electric field and current density of (Mg 1/3 Ta 2/3 ) 0.01 Ti 0.99 O 2 ceramic samples with time. As can be seen from the figure, when the electric field is applied, the current density instantly reaches the preset value of the first step, and the first stage of flash sintering is almost 0, which may be related to the higher electric field (Wang et al, 2022a(Wang et al, , 2022b. Hold for 1 min when the first preset current (2.0 A) is reached, then quickly adjust the current density to the second preset current (1.0 A).…”

“…With increasing frequency, the ε′ of the conventional sintered and two-step flash sintered samples decreases gradually in the whole test temperature range, which may be caused by the attenuation of polarization, which corresponds to the previous study (Liu et al , 2020a, 2020b). The ε′ of ceramic samples prepared by conventional sintered and two-step flash sintering increases with increasing temperature, which may be caused by space charge polarization (Liu et al , 2020a, 2020b; Wang et al , 2022a, 2022b). However, for the ceramic samples prepared by two-step flash sintering at 700 V/cm, the dielectric loss increases sharply when the temperature is higher than 250°C, which may be caused by more defective structures in the two-step flash sintering samples (Wang et al , 2019a, 2019b, 2019c).…”

“…Zhang et al (2016) explored the flash sintering behavior of TiO 2 ceramics by doping (N doping or V doping). Peng et al(2022); Wang et al(2022aWang et al( , 2022b; and Yang et al (2022) studied the impact of electric field on flash sintering behavior and electrical characteristics of (Re, Ta) (Re = Zn, In, Zr) co-doped TiO 2 ceramics. Nie et al (2017) proposed a new sintering method, two-step flash sintering method, to obtain dense ceramic samples using ZnO as the system.…”

Flash Sintering Preparation and Characterizations of (M0.5Ta0.5)0.05Ti0.95O2 (M = Al, Ga, In) Colossal Dielectric Ceramics

“…Many ceramic materials have been proved to be prepared by flash sintering, including ionic conductor (3YSZ 21 ), insulator (Al 2 O 3 22), semiconductor (ZnO, 23 TiO 2 24 ) and so on. Xu et al [25][26][27][28] found that flash sintering could obtain similar electrical properties to TS in TiO 2 -based CP ceramics. The dielectric properties of co-doped TiO 2 ceramics are summarized in Table III.…”