Improved microstructure and significantly enhanced dielectric properties of Al³⁺/Cr³⁺/Ta⁵⁺ triple-doped TiO₂ ceramics by Re-balancing charge compensation

Abstract

The dielectric properties of Cr3+/Ta3+ co-doped TiO2 can be significantly improved by triple doping with Al3+ due to the re-balance of charge compensation.

The origin of dielectric relaxation behavior in TiO2 based ceramics co-doped with Zn2+, W6+ ions under a N2/O2 sintering atmosphere

“…The binding energy peak at 529.9 eV can correspond to Ti-O bonds, 24 the lower binding energy peaks at This journal is © the Societies 2023 531.7 eV can be attributed to oxygen vacancies and surface hydroxyl (-OH). 50 Another binding energy peak at 532.3 eV is assigned to surface absorption H 2 O. 51 At the same time, the Ti 2p 1/2 and Ti 2p 3/2 profiles are shown in Fig.…”

Extremely reduced loss tangent with retaining ultra high dielectric permittivity in Mg2+-doped La1.9Sr0.1NiO4 ceramics

“…Furthermore, a significantly reduced tanδ with excellent temperature stability of ε′ (at 1 MHz) in the temperature range of 250–450 K was obtained in La 1.5 Sr 0.5 NiO 4 (LSNO)– x SiO 2 composites, which was attributed to the formation of insulating grain boundaries [ 28 ]. Thus, it is reasonable to expect that the greatly enhanced resistance of the grain boundary can improve the dielectric properties of giant dielectric oxides [ 6 , 15 , 24 , [43] , [44] , [45] ]. Unfortunately, in both cases, the DC conductivities and related tanδ values for the La 1.5 Sr 0.5 NiO 4 –0.8SiO 2 and Mg 2+ −doped La 1.7 Sr 0.3 NiO 4 ceramics were still too large.…”

Colossal Permittivity Characteristics of (Nb, Si) Co-Doped TiO2 Ceramics

“…The room temperature relative permittivity (ε ) of pure TiO 2 is ~100, which is not suitable for practical energy storage applications. Interestingly, recent studies reported colossal relative permittivity (CP) for co-doped TiO 2 in the form (A, B) x Ti 1−x O 2 , where A is pentavalent and B is tri-or bivalent cations [2][3][4][5][6]. The origin of CP of the co-doped TiO 2 ceramics is controversially discussed in the literature.…”